Aggregator

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0356 AM CDT Sat Jun 15 2024 Valid 181200Z - 231200Z ...DISCUSSION... For the period, a strong upper ridge is forecast to remain over the East. An upper trough will move into the northern Plains on Tuesday/D4 and Wednesday/D5, with most of the energy moving into eastern Canada thereafter. To the west, only a weak upper trough is forecast. Thunderstorms will be possible from MN southwestward into the central Plains on Tuesday/D4 along a cold front, and some severe threat appears likely as the stronger midlevel southwesterlies extend from MN into NE. Instability will begin to be limited by warming temperatures aloft, but ample low-level moisture will remain ahead off the cold front with mid to upper 60s F dewpoints common. Front-parallel flow and a progressive cold front will likely yield areas of damaging wind potential, and a 15% area has been introduced near the surface low over northern Minnesota. Severe storms chances are forecast to lessen by Wednesday/D5 over the Plains/Upper MS Valley as the stronger winds aloft shift out of the area. Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sat Jun 15 2024 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY... ...SUMMARY... Scattered strong to severe storms will be possible Monday mainly from the Dakotas into Minnesota. ...Synopsis and Discussion... On Monday, a lead wave associated with early day storms will move across the eastern Dakotas and MN and toward Lake Superior by afternoon, with temporary height rises. Meanwhile, a front will gradually shift north as the air mass recovers, reaching eastern SD into central MN and northern WI by late afternoon. South of this front, a moist air mass will exist with mid to upper 60s F dewpoints and warming temperatures resulting in moderate instability. To the west, an upper trough will gradually move across the Rockies with strengthening mid and high level southwesterlies into the northern Plains. Winds aloft will be nearly parallel to the surface front, which should act as the focus for development late in the day and into the night. Given only gradual height falls, low-level warm advection aided by 50 kt 850 mb winds looks to be the main lifting mechanism. Forecast soundings show strong elevated instability developing north of the front, which appears favorable for hail. Any organized clusters in proximity to the boundary and moving parallel to it could perhaps produce locally damaging gusts as well. ..Jewell.. 06/15/2024 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sat Jun 15 2024 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY... ...SUMMARY... Scattered strong to severe storms will be possible Monday mainly from the Dakotas into Minnesota. ...Synopsis and Discussion... On Monday, a lead wave associated with early day storms will move across the eastern Dakotas and MN and toward Lake Superior by afternoon, with temporary height rises. Meanwhile, a front will gradually shift north as the air mass recovers, reaching eastern SD into central MN and northern WI by late afternoon. South of this front, a moist air mass will exist with mid to upper 60s F dewpoints and warming temperatures resulting in moderate instability. To the west, an upper trough will gradually move across the Rockies with strengthening mid and high level southwesterlies into the northern Plains. Winds aloft will be nearly parallel to the surface front, which should act as the focus for development late in the day and into the night. Given only gradual height falls, low-level warm advection aided by 50 kt 850 mb winds looks to be the main lifting mechanism. Forecast soundings show strong elevated instability developing north of the front, which appears favorable for hail. Any organized clusters in proximity to the boundary and moving parallel to it could perhaps produce locally damaging gusts as well. ..Jewell.. 06/15/2024 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sat Jun 15 2024 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY... ...SUMMARY... Scattered strong to severe storms will be possible Monday mainly from the Dakotas into Minnesota. ...Synopsis and Discussion... On Monday, a lead wave associated with early day storms will move across the eastern Dakotas and MN and toward Lake Superior by afternoon, with temporary height rises. Meanwhile, a front will gradually shift north as the air mass recovers, reaching eastern SD into central MN and northern WI by late afternoon. South of this front, a moist air mass will exist with mid to upper 60s F dewpoints and warming temperatures resulting in moderate instability. To the west, an upper trough will gradually move across the Rockies with strengthening mid and high level southwesterlies into the northern Plains. Winds aloft will be nearly parallel to the surface front, which should act as the focus for development late in the day and into the night. Given only gradual height falls, low-level warm advection aided by 50 kt 850 mb winds looks to be the main lifting mechanism. Forecast soundings show strong elevated instability developing north of the front, which appears favorable for hail. Any organized clusters in proximity to the boundary and moving parallel to it could perhaps produce locally damaging gusts as well. ..Jewell.. 06/15/2024 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sat Jun 15 2024 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY... ...SUMMARY... Scattered strong to severe storms will be possible Monday mainly from the Dakotas into Minnesota. ...Synopsis and Discussion... On Monday, a lead wave associated with early day storms will move across the eastern Dakotas and MN and toward Lake Superior by afternoon, with temporary height rises. Meanwhile, a front will gradually shift north as the air mass recovers, reaching eastern SD into central MN and northern WI by late afternoon. South of this front, a moist air mass will exist with mid to upper 60s F dewpoints and warming temperatures resulting in moderate instability. To the west, an upper trough will gradually move across the Rockies with strengthening mid and high level southwesterlies into the northern Plains. Winds aloft will be nearly parallel to the surface front, which should act as the focus for development late in the day and into the night. Given only gradual height falls, low-level warm advection aided by 50 kt 850 mb winds looks to be the main lifting mechanism. Forecast soundings show strong elevated instability developing north of the front, which appears favorable for hail. Any organized clusters in proximity to the boundary and moving parallel to it could perhaps produce locally damaging gusts as well. ..Jewell.. 06/15/2024 Read more

SPC 0730Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Sat Jun 15 2024 Valid 171200Z - 181200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY... ...SUMMARY... Scattered strong to severe storms will be possible Monday mainly from the Dakotas into Minnesota. ...Synopsis and Discussion... On Monday, a lead wave associated with early day storms will move across the eastern Dakotas and MN and toward Lake Superior by afternoon, with temporary height rises. Meanwhile, a front will gradually shift north as the air mass recovers, reaching eastern SD into central MN and northern WI by late afternoon. South of this front, a moist air mass will exist with mid to upper 60s F dewpoints and warming temperatures resulting in moderate instability. To the west, an upper trough will gradually move across the Rockies with strengthening mid and high level southwesterlies into the northern Plains. Winds aloft will be nearly parallel to the surface front, which should act as the focus for development late in the day and into the night. Given only gradual height falls, low-level warm advection aided by 50 kt 850 mb winds looks to be the main lifting mechanism. Forecast soundings show strong elevated instability developing north of the front, which appears favorable for hail. Any organized clusters in proximity to the boundary and moving parallel to it could perhaps produce locally damaging gusts as well. ..Jewell.. 06/15/2024 Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0206 AM CDT Sat Jun 15 2024 Valid 151200Z - 161200Z ...Synopsis... A mid-level trough and attendant belt of enhanced west to southwesterly flow moving across the Cascades into the Northern Rockies will bring potential for breezy/dry downslope flow in the lee of the Cascades across western Washington/northern Oregon within the Columbia Basin on Saturday. Afternoon relative humidity reductions to 15-25 percent will overlap sustained winds 15-20 mph amid drying fuels. Locally Critical fire weather concerns will be possible, though Critical winds appear too localized to include any areas at this time. Additionally, some Elevated fire weather conditions are likely in the Snake River Plain in Idaho where sustained winds around 30-35 mph will overlap 15-20% RH and modestly receptive fuels. Ahead of the western US trough, a surface trough across southern Nevada into western Arizona will bring breezy/dry conditions across southern Nevada into southwestern Utah and northwestern Arizona, where relative humidity reductions into the teens to single digits will overlap sustained southwesterly flow around 10-15 mph within critically dry fuels. Given sub-critical winds, an Elevated delineation covers this threat well. ..Thornton.. 06/15/2024 ...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 0206 AM CDT Sat Jun 15 2024 Valid 151200Z - 161200Z ...Synopsis... A mid-level trough and attendant belt of enhanced west to southwesterly flow moving across the Cascades into the Northern Rockies will bring potential for breezy/dry downslope flow in the lee of the Cascades across western Washington/northern Oregon within the Columbia Basin on Saturday. Afternoon relative humidity reductions to 15-25 percent will overlap sustained winds 15-20 mph amid drying fuels. Locally Critical fire weather concerns will be possible, though Critical winds appear too localized to include any areas at this time. Additionally, some Elevated fire weather conditions are likely in the Snake River Plain in Idaho where sustained winds around 30-35 mph will overlap 15-20% RH and modestly receptive fuels. Ahead of the western US trough, a surface trough across southern Nevada into western Arizona will bring breezy/dry conditions across southern Nevada into southwestern Utah and northwestern Arizona, where relative humidity reductions into the teens to single digits will overlap sustained southwesterly flow around 10-15 mph within critically dry fuels. Given sub-critical winds, an Elevated delineation covers this threat well. ..Thornton.. 06/15/2024 ...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 0206 AM CDT Sat Jun 15 2024 Valid 151200Z - 161200Z ...Synopsis... A mid-level trough and attendant belt of enhanced west to southwesterly flow moving across the Cascades into the Northern Rockies will bring potential for breezy/dry downslope flow in the lee of the Cascades across western Washington/northern Oregon within the Columbia Basin on Saturday. Afternoon relative humidity reductions to 15-25 percent will overlap sustained winds 15-20 mph amid drying fuels. Locally Critical fire weather concerns will be possible, though Critical winds appear too localized to include any areas at this time. Additionally, some Elevated fire weather conditions are likely in the Snake River Plain in Idaho where sustained winds around 30-35 mph will overlap 15-20% RH and modestly receptive fuels. Ahead of the western US trough, a surface trough across southern Nevada into western Arizona will bring breezy/dry conditions across southern Nevada into southwestern Utah and northwestern Arizona, where relative humidity reductions into the teens to single digits will overlap sustained southwesterly flow around 10-15 mph within critically dry fuels. Given sub-critical winds, an Elevated delineation covers this threat well. ..Thornton.. 06/15/2024 ...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 0206 AM CDT Sat Jun 15 2024 Valid 151200Z - 161200Z ...Synopsis... A mid-level trough and attendant belt of enhanced west to southwesterly flow moving across the Cascades into the Northern Rockies will bring potential for breezy/dry downslope flow in the lee of the Cascades across western Washington/northern Oregon within the Columbia Basin on Saturday. Afternoon relative humidity reductions to 15-25 percent will overlap sustained winds 15-20 mph amid drying fuels. Locally Critical fire weather concerns will be possible, though Critical winds appear too localized to include any areas at this time. Additionally, some Elevated fire weather conditions are likely in the Snake River Plain in Idaho where sustained winds around 30-35 mph will overlap 15-20% RH and modestly receptive fuels. Ahead of the western US trough, a surface trough across southern Nevada into western Arizona will bring breezy/dry conditions across southern Nevada into southwestern Utah and northwestern Arizona, where relative humidity reductions into the teens to single digits will overlap sustained southwesterly flow around 10-15 mph within critically dry fuels. Given sub-critical winds, an Elevated delineation covers this threat well. ..Thornton.. 06/15/2024 ...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 0206 AM CDT Sat Jun 15 2024 Valid 151200Z - 161200Z ...Synopsis... A mid-level trough and attendant belt of enhanced west to southwesterly flow moving across the Cascades into the Northern Rockies will bring potential for breezy/dry downslope flow in the lee of the Cascades across western Washington/northern Oregon within the Columbia Basin on Saturday. Afternoon relative humidity reductions to 15-25 percent will overlap sustained winds 15-20 mph amid drying fuels. Locally Critical fire weather concerns will be possible, though Critical winds appear too localized to include any areas at this time. Additionally, some Elevated fire weather conditions are likely in the Snake River Plain in Idaho where sustained winds around 30-35 mph will overlap 15-20% RH and modestly receptive fuels. Ahead of the western US trough, a surface trough across southern Nevada into western Arizona will bring breezy/dry conditions across southern Nevada into southwestern Utah and northwestern Arizona, where relative humidity reductions into the teens to single digits will overlap sustained southwesterly flow around 10-15 mph within critically dry fuels. Given sub-critical winds, an Elevated delineation covers this threat well. ..Thornton.. 06/15/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Jun 15 2024 Valid 161200Z - 171200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF CENTRAL AND NORTHERN ARIZONA INTO SOUTHERN UTAH... ...Synopsis... The western US trough will deepen on Sunday, with strengthening southwesterly flow overspreading much of the desert Southwest. Fuels in this region have seen significant drying after several days of warm and dry conditions. Latest guidance indicates ERCs are in the 90th percentile across much of northern and central Arizona. This is further supported by recent fire activity in this region. Relative humidity reductions to 5-10 percent will overlap sustained winds 15-20 mph across central/northern Arizona and southern Utah, where a Critical delineation was included with this outlook. Outside of this region, a more broad area of Elevated fire weather conditions will be possible across much of central/southern Nevada into southern Arizona, where there is less confidence is sustained Critical wind speeds. Elevated conditions may also extend into portions of western Nevada in the lee of the Sierras. In this region, afternoon relative humidity reductions to 15-20 percent will overlap sustained winds 10-15 mph (locally higher) amid modestly receptive fuels. ..Thornton.. 06/15/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Jun 15 2024 Valid 161200Z - 171200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF CENTRAL AND NORTHERN ARIZONA INTO SOUTHERN UTAH... ...Synopsis... The western US trough will deepen on Sunday, with strengthening southwesterly flow overspreading much of the desert Southwest. Fuels in this region have seen significant drying after several days of warm and dry conditions. Latest guidance indicates ERCs are in the 90th percentile across much of northern and central Arizona. This is further supported by recent fire activity in this region. Relative humidity reductions to 5-10 percent will overlap sustained winds 15-20 mph across central/northern Arizona and southern Utah, where a Critical delineation was included with this outlook. Outside of this region, a more broad area of Elevated fire weather conditions will be possible across much of central/southern Nevada into southern Arizona, where there is less confidence is sustained Critical wind speeds. Elevated conditions may also extend into portions of western Nevada in the lee of the Sierras. In this region, afternoon relative humidity reductions to 15-20 percent will overlap sustained winds 10-15 mph (locally higher) amid modestly receptive fuels. ..Thornton.. 06/15/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Jun 15 2024 Valid 161200Z - 171200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF CENTRAL AND NORTHERN ARIZONA INTO SOUTHERN UTAH... ...Synopsis... The western US trough will deepen on Sunday, with strengthening southwesterly flow overspreading much of the desert Southwest. Fuels in this region have seen significant drying after several days of warm and dry conditions. Latest guidance indicates ERCs are in the 90th percentile across much of northern and central Arizona. This is further supported by recent fire activity in this region. Relative humidity reductions to 5-10 percent will overlap sustained winds 15-20 mph across central/northern Arizona and southern Utah, where a Critical delineation was included with this outlook. Outside of this region, a more broad area of Elevated fire weather conditions will be possible across much of central/southern Nevada into southern Arizona, where there is less confidence is sustained Critical wind speeds. Elevated conditions may also extend into portions of western Nevada in the lee of the Sierras. In this region, afternoon relative humidity reductions to 15-20 percent will overlap sustained winds 10-15 mph (locally higher) amid modestly receptive fuels. ..Thornton.. 06/15/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0157 AM CDT Sat Jun 15 2024 Valid 161200Z - 171200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF CENTRAL AND NORTHERN ARIZONA INTO SOUTHERN UTAH... ...Synopsis... The western US trough will deepen on Sunday, with strengthening southwesterly flow overspreading much of the desert Southwest. Fuels in this region have seen significant drying after several days of warm and dry conditions. Latest guidance indicates ERCs are in the 90th percentile across much of northern and central Arizona. This is further supported by recent fire activity in this region. Relative humidity reductions to 5-10 percent will overlap sustained winds 15-20 mph across central/northern Arizona and southern Utah, where a Critical delineation was included with this outlook. Outside of this region, a more broad area of Elevated fire weather conditions will be possible across much of central/southern Nevada into southern Arizona, where there is less confidence is sustained Critical wind speeds. Elevated conditions may also extend into portions of western Nevada in the lee of the Sierras. In this region, afternoon relative humidity reductions to 15-20 percent will overlap sustained winds 10-15 mph (locally higher) amid modestly receptive fuels. ..Thornton.. 06/15/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more