Aggregator

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0136 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...Synopsis... High pressure will increase in amplitude across the western US today, with mainly terrain driven breezes expected where fuels are the driest. Across portions of western Colorado, a shortwave trough will bring isolated dry thunderstorms within a plume of shallow mid-level moisture. Fuels within this region are critically dry with ERCs exceeding critically dry thresholds, with fuel moisture dipping into the single digits amid a severe drought and more than a month without appreciable rainfall. New fire activity has been noted over the last 24-48 hours with lightning activity. An isolated dry thunderstorm area was maintained across this region with this outlook. ..Thornton.. 07/11/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0136 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...Synopsis... High pressure will increase in amplitude across the western US today, with mainly terrain driven breezes expected where fuels are the driest. Across portions of western Colorado, a shortwave trough will bring isolated dry thunderstorms within a plume of shallow mid-level moisture. Fuels within this region are critically dry with ERCs exceeding critically dry thresholds, with fuel moisture dipping into the single digits amid a severe drought and more than a month without appreciable rainfall. New fire activity has been noted over the last 24-48 hours with lightning activity. An isolated dry thunderstorm area was maintained across this region with this outlook. ..Thornton.. 07/11/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0136 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...Synopsis... High pressure will increase in amplitude across the western US today, with mainly terrain driven breezes expected where fuels are the driest. Across portions of western Colorado, a shortwave trough will bring isolated dry thunderstorms within a plume of shallow mid-level moisture. Fuels within this region are critically dry with ERCs exceeding critically dry thresholds, with fuel moisture dipping into the single digits amid a severe drought and more than a month without appreciable rainfall. New fire activity has been noted over the last 24-48 hours with lightning activity. An isolated dry thunderstorm area was maintained across this region with this outlook. ..Thornton.. 07/11/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0136 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...Synopsis... High pressure will increase in amplitude across the western US today, with mainly terrain driven breezes expected where fuels are the driest. Across portions of western Colorado, a shortwave trough will bring isolated dry thunderstorms within a plume of shallow mid-level moisture. Fuels within this region are critically dry with ERCs exceeding critically dry thresholds, with fuel moisture dipping into the single digits amid a severe drought and more than a month without appreciable rainfall. New fire activity has been noted over the last 24-48 hours with lightning activity. An isolated dry thunderstorm area was maintained across this region with this outlook. ..Thornton.. 07/11/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook CORR 1 NWS Storm Prediction Center Norman OK 0121 AM CDT Fri Jul 11 2025 Valid 111200Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING ACROSS PARTS OF NORTHEASTERN KANSAS...MUCH OF NORTHERN MISSOURI...SOUTHEASTERN IOWA...NORTHERN ILLINOIS...ADJACENT SOUTHERN WISCONSIN AND NORTHWESTERN INDIANA...AND PARTS OF SOUTHWESTERN LOWER MICHIGAN... CORRECTED FOR TYPOS ...SUMMARY... Strong thunderstorms are likely to impact a corridor from the lower Missouri Valley into southern portions of the Great Lakes region this afternoon and evening, accompanied by a risk for damaging wind gusts, a few tornadoes and some hail. ...Discussion... While mid/upper ridging across the subtropical into southern mid-latitudes remains at least a bit suppressed for the time of year, models indicate that the stronger westerlies will remain confined to the higher latitudes. It does appear that one notable short wave trough, now digging to the lee of the Canadian and northern U.S. Rockies, will progress eastward along the central Canadian/U.S. border vicinity today through tonight, and gradually pivot from a positive to neutral tilt. As it does, preceding weak mid-level troughing, and at least a couple of embedded convective perturbations, are forecast to accelerate northeastward within weak to modest ambient flow backing to a southwesterly component across the lower Missouri Valley vicinity into the Great Lakes region. At the same time, northwesterly mid-level flow will be maintained with weak height falls across the southern Rockies into adjacent Great Plains, while gradual mid-level height rises are forecast across the Appalachians into Atlantic Seaboard. In lower-levels, the primary short wave trough may support a modest developing surface low across northwestern Ontario, with cooler and drier air in its wake overspreading much of the northern Great Plains by 12Z Saturday. Another low emerging from the central Great Plains is forecast to migrate northeast of the lower Missouri Valley toward the upper Great Lakes, along an initially diffuse low-level baroclinic zone. ...Lower Missouri Valley into Great Lakes... The low-level baroclinic zone may still be a focus for weakening convective development at the outset of the period. However, as the convection dissipates further, models suggest that the boundary will become better defined with strengthening differential heating. Surface dew points near and above 70F, beneath modestly steep mid-level lapse rates, are forecast to contribute to CAPE on the order of 2000-3000 J/kg along and south of the boundary, gradually tapering to the north, beneath a lingering belt of convectively augmented mid-level flow (on the order of 30-50 kt in the 700-500 mb layer). Coupled with modest, clockwise-curved low-level hodographs developing in advance of the migratory low, the environment may become conducive to supercell structures posing a risk for a few tornadoes across parts of northern Missouri and southeastern Iowa into northern Illinois, before damaging wind gusts become the more predominant potential hazard as convection tends to grow upscale into clusters through this evening. ...Southern Rockies into the Great Plains... Thermodynamic profiles characterized by modest low-level moisture, but with generally steep lapse rates, including fairly deep boundary-layer mixing, may become conducive to scattered thunderstorm clusters posing a risk for severe wind and hail late this afternoon and evening. This may be aided by modest shear beneath the northwesterly mid-level flow, with thunderstorm activity mostly initiating off the higher terrain of the Front Range through Sangre de Cristo Mountains. However, low-level convergence within surface troughing across southern Kansas through the Oklahoma/Texas Panhandle vicinity may also become sufficient for thunderstorm initiation during the peak late afternoon heating. ..Kerr/Thornton.. 07/11/2025 Read more

WW 0503 Status Updates
STATUS REPORT ON WW 503 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W LWD TO 50 NE SDA TO 40 WNW DSM TO 35 NNW DSM TO 35 ESE FOD. ..BENTLEY..07/11/25 ATTN...WFO...DMX...OAX... STATUS REPORT FOR WS 503 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC001-003-007-015-039-049-051-053-077-099-117-121-123-125-127- 135-153-157-159-169-171-173-175-179-181-185-110840- IA . IOWA COUNTIES INCLUDED ARE ADAIR ADAMS APPANOOSE BOONE CLARKE DALLAS DAVIS DECATUR GUTHRIE JASPER LUCAS MADISON MAHASKA MARION MARSHALL MONROE POLK POWESHIEK RINGGOLD STORY TAMA TAYLOR UNION WAPELLO WARREN WAYNE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0503 Status Updates
STATUS REPORT ON WW 503 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W LWD TO 50 NE SDA TO 40 WNW DSM TO 35 NNW DSM TO 35 ESE FOD. ..BENTLEY..07/11/25 ATTN...WFO...DMX...OAX... STATUS REPORT FOR WS 503 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC001-003-007-015-039-049-051-053-077-099-117-121-123-125-127- 135-153-157-159-169-171-173-175-179-181-185-110840- IA . IOWA COUNTIES INCLUDED ARE ADAIR ADAMS APPANOOSE BOONE CLARKE DALLAS DAVIS DECATUR GUTHRIE JASPER LUCAS MADISON MAHASKA MARION MARSHALL MONROE POLK POWESHIEK RINGGOLD STORY TAMA TAYLOR UNION WAPELLO WARREN WAYNE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0503 Status Updates
STATUS REPORT ON WW 503 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W LWD TO 50 NE SDA TO 40 WNW DSM TO 35 NNW DSM TO 35 ESE FOD. ..BENTLEY..07/11/25 ATTN...WFO...DMX...OAX... STATUS REPORT FOR WS 503 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC001-003-007-015-039-049-051-053-077-099-117-121-123-125-127- 135-153-157-159-169-171-173-175-179-181-185-110840- IA . IOWA COUNTIES INCLUDED ARE ADAIR ADAMS APPANOOSE BOONE CLARKE DALLAS DAVIS DECATUR GUTHRIE JASPER LUCAS MADISON MAHASKA MARION MARSHALL MONROE POLK POWESHIEK RINGGOLD STORY TAMA TAYLOR UNION WAPELLO WARREN WAYNE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0503 Status Updates
STATUS REPORT ON WW 503 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 SE SDA TO 30 ENE SDA TO 40 SSE DNS TO 20 SE DNS TO 15 ESE SLB. ..BENTLEY..07/11/25 ATTN...WFO...DMX...OAX... STATUS REPORT FOR WS 503 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC001-003-007-009-015-027-029-039-049-051-053-073-077-099-117- 121-123-125-127-135-153-157-159-169-171-173-175-179-181-185- 110740- IA . IOWA COUNTIES INCLUDED ARE ADAIR ADAMS APPANOOSE AUDUBON BOONE CARROLL CASS CLARKE DALLAS DAVIS DECATUR GREENE GUTHRIE JASPER LUCAS MADISON MAHASKA MARION MARSHALL MONROE POLK POWESHIEK RINGGOLD STORY TAMA TAYLOR UNION WAPELLO WARREN WAYNE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 503 SEVERE TSTM IA NE 110045Z - 110700Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 503 NWS Storm Prediction Center Norman OK 745 PM CDT Thu Jul 10 2025 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwest Iowa Southeast Nebraska * Effective this Thursday night and Friday morning from 745 PM until 200 AM CDT. * Primary threats include... Scattered damaging winds likely with isolated significant gusts to 75 mph possible Isolated very large hail events to 2 inches in diameter possible A tornado or two possible SUMMARY...Clusters of thunderstorms over Nebraska will track eastward for the next several hours across the watch area. Locally damaging wind gusts are the primary concern, although a few of the storms may also pose a risk of large hail or even a tornado. The severe thunderstorm watch area is approximately along and 55 statute miles north and south of a line from 30 miles west of Lincoln NE to 10 miles east of Des Moines IA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 501...WW 502... AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 27030. ...Hart Read more