Severe Storms

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1048 AM CST Sun Jan 21 2024 Valid 211700Z - 221200Z ...NO CRITICAL AREAS... No changes. See previous discussion below. ..Bentley.. 01/21/2024 .PREV DISCUSSION... /ISSUED 1213 AM CST Sun Jan 21 2024/ ...Synopsis... The central US ridge will shift eastward today as weak disturbances move inland across the western US. Some increase of southerly flow is expected across the Plains. Cool and moist conditions, along with fresh snow pack across much of the central/northern Plains, should keep fire weather concerns low. ...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 1048 AM CST Sun Jan 21 2024 Valid 211700Z - 221200Z ...NO CRITICAL AREAS... No changes. See previous discussion below. ..Bentley.. 01/21/2024 .PREV DISCUSSION... /ISSUED 1213 AM CST Sun Jan 21 2024/ ...Synopsis... The central US ridge will shift eastward today as weak disturbances move inland across the western US. Some increase of southerly flow is expected across the Plains. Cool and moist conditions, along with fresh snow pack across much of the central/northern Plains, should keep fire weather concerns low. ...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 1048 AM CST Sun Jan 21 2024 Valid 211700Z - 221200Z ...NO CRITICAL AREAS... No changes. See previous discussion below. ..Bentley.. 01/21/2024 .PREV DISCUSSION... /ISSUED 1213 AM CST Sun Jan 21 2024/ ...Synopsis... The central US ridge will shift eastward today as weak disturbances move inland across the western US. Some increase of southerly flow is expected across the Plains. Cool and moist conditions, along with fresh snow pack across much of the central/northern Plains, should keep fire weather concerns low. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1029 AM CST Sun Jan 21 2024 Valid 211630Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... Overall thunderstorm potential will be fairly limited/confined, with severe thunderstorms not expected across the CONUS. Expansive surface high pressure will prevail across the eastern half of the CONUS, along with an accompanying cold continental airmass. Low-level warm advection will expand across the southern Plains into tonight, with a northward transport of higher theta-e air. This will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas tonight. In the West, multiple low-amplitude disturbances will spread inland and across the West and Southwest deserts through tonight. Pacific moisture and weak instability will support a few thunderstorms, across southern Arizona vicinity today, and portions of coastal California tonight. ..Guyer/Lyons.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0651 AM CST Sun Jan 21 2024 Valid 211300Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast through tonight. ...Discussion... A broad zone of low-amplitude cyclonic flow aloft is forecast to encompass the western U.S. today, and will expand eastward into the Plains tonight. Farther east, an eastern U.S. trough will continue departing into the western Atlantic, while ridging shifts eastward in its wake, and ahead of the expanding western U.S. cyclonic flow. At the surface, an expansive surface high will prevail over the eastern half of the country, along with an accompanying cold continental airmass. As western U.S. troughing advances eastward, including a lead short wave that will cross the Desert Southwest and northern Mexico through the period, low-level warm advection will expand across the southern Plains. Northward transport of higher theta-e low-level air will support elevated destabilization, and the development of showers and thunderstorms across parts of central and eastern Texas, mainly tonight. Farther west, smaller cyclonic disturbances will continue spreading eastward/inland, which -- coupled with abundant Pacific moisture -- will result in widespread precipitation. While instability should remain weak at best, a few thunderstorms will be possible across the southern Arizona vicinity today, and portions of coastal California tonight. In all areas, severe storms are not expected. ..Goss/Mosier.. 01/21/2024 Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CST Sun Jan 21 2024 Valid 241200Z - 291200Z ...DISCUSSION... ...Wednesday/Day 4 to Friday/Day 6... On Wednesday and Thursday, an upper-level trough is forecast to move from northern Mexico to the mid Mississippi Valley, becoming considerably less amplified with time. At the surface, a cold front is forecast to move eastward across the Gulf Coast states. Ahead of the front on Wednesday, a moist airmass is forecast to be in place with scattered thunderstorms developing across much of the region. As the front progresses eastward Wednesday night and Thursday, model forecasts suggest that a line could gradually organize in the central Gulf Coast states. An isolated severe threat would be possible as cell coverage and low-level moisture gradually increase, but the greatest threat will probably be confined to areas near the Gulf Coast where instability is forecast to be the strongest. At this time, model forecast parameters suggest any severe threat will remain localized at best. On Friday, southwest flow at mid-levels is forecast across the Southeast, as an upper-level trough moves toward the southern Plains. Ahead of this trough, thunderstorms will again be possible Friday afternoon along the Gulf Coast, with the possibility of a localized severe threat over parts of the Florida Panhandle. However, differences in model solutions suggest uncertainty is substantial. ...Saturday/Day 7 and Sunday/Day 8... On Saturday and Sunday, a strong mid-level jet is forecast to move northeastward from the southern Plains to the Eastern Seaboard. Ahead of this feature, a moist airmass is forecast to be in place in the central Gulf Coast states. Thunderstorm development will be possible ahead of the jet within the moist airmass. However, instability is forecast to remain relatively weak across the region suggesting that any potential severe threat will remain relatively confined. Uncertainty is substantial concerning the magnitude of any severe threat on Saturday, mainly due to model differences regarding the timing of the upper-level trough and the strength of moisture return. The potential for thunderstorms is expected to decrease on Sunday as a large area of surface high pressure moves into the central and eastern U.S. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CST Sun Jan 21 2024 Valid 241200Z - 291200Z ...DISCUSSION... ...Wednesday/Day 4 to Friday/Day 6... On Wednesday and Thursday, an upper-level trough is forecast to move from northern Mexico to the mid Mississippi Valley, becoming considerably less amplified with time. At the surface, a cold front is forecast to move eastward across the Gulf Coast states. Ahead of the front on Wednesday, a moist airmass is forecast to be in place with scattered thunderstorms developing across much of the region. As the front progresses eastward Wednesday night and Thursday, model forecasts suggest that a line could gradually organize in the central Gulf Coast states. An isolated severe threat would be possible as cell coverage and low-level moisture gradually increase, but the greatest threat will probably be confined to areas near the Gulf Coast where instability is forecast to be the strongest. At this time, model forecast parameters suggest any severe threat will remain localized at best. On Friday, southwest flow at mid-levels is forecast across the Southeast, as an upper-level trough moves toward the southern Plains. Ahead of this trough, thunderstorms will again be possible Friday afternoon along the Gulf Coast, with the possibility of a localized severe threat over parts of the Florida Panhandle. However, differences in model solutions suggest uncertainty is substantial. ...Saturday/Day 7 and Sunday/Day 8... On Saturday and Sunday, a strong mid-level jet is forecast to move northeastward from the southern Plains to the Eastern Seaboard. Ahead of this feature, a moist airmass is forecast to be in place in the central Gulf Coast states. Thunderstorm development will be possible ahead of the jet within the moist airmass. However, instability is forecast to remain relatively weak across the region suggesting that any potential severe threat will remain relatively confined. Uncertainty is substantial concerning the magnitude of any severe threat on Saturday, mainly due to model differences regarding the timing of the upper-level trough and the strength of moisture return. The potential for thunderstorms is expected to decrease on Sunday as a large area of surface high pressure moves into the central and eastern U.S. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CST Sun Jan 21 2024 Valid 241200Z - 291200Z ...DISCUSSION... ...Wednesday/Day 4 to Friday/Day 6... On Wednesday and Thursday, an upper-level trough is forecast to move from northern Mexico to the mid Mississippi Valley, becoming considerably less amplified with time. At the surface, a cold front is forecast to move eastward across the Gulf Coast states. Ahead of the front on Wednesday, a moist airmass is forecast to be in place with scattered thunderstorms developing across much of the region. As the front progresses eastward Wednesday night and Thursday, model forecasts suggest that a line could gradually organize in the central Gulf Coast states. An isolated severe threat would be possible as cell coverage and low-level moisture gradually increase, but the greatest threat will probably be confined to areas near the Gulf Coast where instability is forecast to be the strongest. At this time, model forecast parameters suggest any severe threat will remain localized at best. On Friday, southwest flow at mid-levels is forecast across the Southeast, as an upper-level trough moves toward the southern Plains. Ahead of this trough, thunderstorms will again be possible Friday afternoon along the Gulf Coast, with the possibility of a localized severe threat over parts of the Florida Panhandle. However, differences in model solutions suggest uncertainty is substantial. ...Saturday/Day 7 and Sunday/Day 8... On Saturday and Sunday, a strong mid-level jet is forecast to move northeastward from the southern Plains to the Eastern Seaboard. Ahead of this feature, a moist airmass is forecast to be in place in the central Gulf Coast states. Thunderstorm development will be possible ahead of the jet within the moist airmass. However, instability is forecast to remain relatively weak across the region suggesting that any potential severe threat will remain relatively confined. Uncertainty is substantial concerning the magnitude of any severe threat on Saturday, mainly due to model differences regarding the timing of the upper-level trough and the strength of moisture return. The potential for thunderstorms is expected to decrease on Sunday as a large area of surface high pressure moves into the central and eastern U.S. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0355 AM CST Sun Jan 21 2024 Valid 241200Z - 291200Z ...DISCUSSION... ...Wednesday/Day 4 to Friday/Day 6... On Wednesday and Thursday, an upper-level trough is forecast to move from northern Mexico to the mid Mississippi Valley, becoming considerably less amplified with time. At the surface, a cold front is forecast to move eastward across the Gulf Coast states. Ahead of the front on Wednesday, a moist airmass is forecast to be in place with scattered thunderstorms developing across much of the region. As the front progresses eastward Wednesday night and Thursday, model forecasts suggest that a line could gradually organize in the central Gulf Coast states. An isolated severe threat would be possible as cell coverage and low-level moisture gradually increase, but the greatest threat will probably be confined to areas near the Gulf Coast where instability is forecast to be the strongest. At this time, model forecast parameters suggest any severe threat will remain localized at best. On Friday, southwest flow at mid-levels is forecast across the Southeast, as an upper-level trough moves toward the southern Plains. Ahead of this trough, thunderstorms will again be possible Friday afternoon along the Gulf Coast, with the possibility of a localized severe threat over parts of the Florida Panhandle. However, differences in model solutions suggest uncertainty is substantial. ...Saturday/Day 7 and Sunday/Day 8... On Saturday and Sunday, a strong mid-level jet is forecast to move northeastward from the southern Plains to the Eastern Seaboard. Ahead of this feature, a moist airmass is forecast to be in place in the central Gulf Coast states. Thunderstorm development will be possible ahead of the jet within the moist airmass. However, instability is forecast to remain relatively weak across the region suggesting that any potential severe threat will remain relatively confined. Uncertainty is substantial concerning the magnitude of any severe threat on Saturday, mainly due to model differences regarding the timing of the upper-level trough and the strength of moisture return. The potential for thunderstorms is expected to decrease on Sunday as a large area of surface high pressure moves into the central and eastern U.S. Read more