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SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1139 PM CST Thu Nov 21 2024 Valid 231200Z - 241200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms appear unlikely across the CONUS Saturday. ...Synopsis... On Saturday, a large upper trough will move out of the northeastern states, with a weak upper ridge moving across the Plains and toward the MS Valley. To the west, a large upper trough will continue eastward across the Great Basin and much of the central and northern Rockies. A lead wave will likely pivot northeastward toward the Dakotas late. At the surface, a large area of high pressure will exist from the southern Plains into the Southeast, maintaining stable conditions. Low pressure will exist ahead of a cold front from the eastern Great Basin into the northern High Plains by late in the day. A low chance of a few lightning flashes may exist along the coastal Pacific Northwest where cold temperatures aloft may result in weak buoyancy. Otherwise, minimal activity will be possible over parts of central ID and vicinity as lapse rates steepen. ..Jewell.. 11/22/2024 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1146 PM CST Thu Nov 21 2024 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today in the Pacific Coastal states. No severe storms are not expected today or tonight across the continental U.S. ...DISCUSSION... A mid-level low will remain over the vicinity of southeast New York today as a mid-level ridge stays over the Rockies. In the eastern Pacific, a mid-level trough will approach the West Coast. A few thunderstorms may develop ahead of the system from the Washington and Oregon coasts southeastward into the northern Sierras. No severe thunderstorms are expected. ..Broyles/Squitieri.. 11/22/2024 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1146 PM CST Thu Nov 21 2024 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today in the Pacific Coastal states. No severe storms are not expected today or tonight across the continental U.S. ...DISCUSSION... A mid-level low will remain over the vicinity of southeast New York today as a mid-level ridge stays over the Rockies. In the eastern Pacific, a mid-level trough will approach the West Coast. A few thunderstorms may develop ahead of the system from the Washington and Oregon coasts southeastward into the northern Sierras. No severe thunderstorms are expected. ..Broyles/Squitieri.. 11/22/2024 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1146 PM CST Thu Nov 21 2024 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today in the Pacific Coastal states. No severe storms are not expected today or tonight across the continental U.S. ...DISCUSSION... A mid-level low will remain over the vicinity of southeast New York today as a mid-level ridge stays over the Rockies. In the eastern Pacific, a mid-level trough will approach the West Coast. A few thunderstorms may develop ahead of the system from the Washington and Oregon coasts southeastward into the northern Sierras. No severe thunderstorms are expected. ..Broyles/Squitieri.. 11/22/2024 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1146 PM CST Thu Nov 21 2024 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today in the Pacific Coastal states. No severe storms are not expected today or tonight across the continental U.S. ...DISCUSSION... A mid-level low will remain over the vicinity of southeast New York today as a mid-level ridge stays over the Rockies. In the eastern Pacific, a mid-level trough will approach the West Coast. A few thunderstorms may develop ahead of the system from the Washington and Oregon coasts southeastward into the northern Sierras. No severe thunderstorms are expected. ..Broyles/Squitieri.. 11/22/2024 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1146 PM CST Thu Nov 21 2024 Valid 221200Z - 231200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few thunderstorms are possible today in the Pacific Coastal states. No severe storms are not expected today or tonight across the continental U.S. ...DISCUSSION... A mid-level low will remain over the vicinity of southeast New York today as a mid-level ridge stays over the Rockies. In the eastern Pacific, a mid-level trough will approach the West Coast. A few thunderstorms may develop ahead of the system from the Washington and Oregon coasts southeastward into the northern Sierras. No severe thunderstorms are expected. ..Broyles/Squitieri.. 11/22/2024 Read more

The smell of the tap water in Abington has been described as a chemical or plastic odor for the past several days, but Aqua Pennsylvania assured its customers that the water is safe to consume. The problem was that the drought forced the water provider to switch water sources. “The noticeable taste and smell, often reported as a stronger smell of chlorine, was traced to our Neshaminy Plant, which supplies water to portions of Montgomery and Bucks counties. We believe the drought conditions have led to changes with our source water that is impacting the taste and smell of the drinking water,” the water provider stated in text sent to The Inquirer. The issue was expected to be resolved with the recent rainfall and tweaks to the water treatment process. The Philadelphia Inquirer (Pa.), Nov 21, 2024

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0646 PM CST Thu Nov 21 2024 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. through tonight. ...DISCUSSION... A mid-level low will move eastward toward the Mid-Atlantic coast tonight, as an upper-level ridge moves through the Rockies. At the surface, a cool and dry airmass will remain over most of the nation, making conditions unfavorable for thunderstorms through this evening and tonight. ..Broyles.. 11/22/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0646 PM CST Thu Nov 21 2024 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. through tonight. ...DISCUSSION... A mid-level low will move eastward toward the Mid-Atlantic coast tonight, as an upper-level ridge moves through the Rockies. At the surface, a cool and dry airmass will remain over most of the nation, making conditions unfavorable for thunderstorms through this evening and tonight. ..Broyles.. 11/22/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0646 PM CST Thu Nov 21 2024 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorms are not expected across the continental U.S. through tonight. ...DISCUSSION... A mid-level low will move eastward toward the Mid-Atlantic coast tonight, as an upper-level ridge moves through the Rockies. At the surface, a cool and dry airmass will remain over most of the nation, making conditions unfavorable for thunderstorms through this evening and tonight. ..Broyles.. 11/22/2024 Read more

No Mesoscale Discussions are in effect as of Thu Nov 21 23:32:02 UTC 2024.

No watches are valid as of Thu Nov 21 23:32:02 UTC 2024.

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0316 PM CST Thu Nov 21 2024 Valid 231200Z - 291200Z Fire weather concerns remain limited through the extended period. The upper trough over the Great Lakes/Ohio River Valley will continue to promote widespread rain/snow chances across these regions and into the Northeast over the next 48 hours. The precipitation associated with this system, combined with seasonal temperatures over the next several days, will limit fuel concerns across the northern/northeastern CONUS. A breakdown of the upper ridge over the central U.S. will transition into a more zonal flow regime over this weekend. As this occurs, increasing west/southwesterly mid-level flow - augmented by transient shortwave troughs - may promote areas of dry/windy conditions in the lee of the southern Rockies. Additionally, a dry return flow regime may become established across the southern Plains this weekend as a lee trough deepens along the High Plains; however, recent widespread rainfall should limit fuel status. This regime will be short-lived as cold air intrusions overspread the Plains behind a deepening surface low during the early to mid-week period. Recent precipitation, cool temperatures, and weak gradient winds should limit fire concerns across the western CONUS. ..Moore.. 11/21/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0316 PM CST Thu Nov 21 2024 Valid 231200Z - 291200Z Fire weather concerns remain limited through the extended period. The upper trough over the Great Lakes/Ohio River Valley will continue to promote widespread rain/snow chances across these regions and into the Northeast over the next 48 hours. The precipitation associated with this system, combined with seasonal temperatures over the next several days, will limit fuel concerns across the northern/northeastern CONUS. A breakdown of the upper ridge over the central U.S. will transition into a more zonal flow regime over this weekend. As this occurs, increasing west/southwesterly mid-level flow - augmented by transient shortwave troughs - may promote areas of dry/windy conditions in the lee of the southern Rockies. Additionally, a dry return flow regime may become established across the southern Plains this weekend as a lee trough deepens along the High Plains; however, recent widespread rainfall should limit fuel status. This regime will be short-lived as cold air intrusions overspread the Plains behind a deepening surface low during the early to mid-week period. Recent precipitation, cool temperatures, and weak gradient winds should limit fire concerns across the western CONUS. ..Moore.. 11/21/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0316 PM CST Thu Nov 21 2024 Valid 231200Z - 291200Z Fire weather concerns remain limited through the extended period. The upper trough over the Great Lakes/Ohio River Valley will continue to promote widespread rain/snow chances across these regions and into the Northeast over the next 48 hours. The precipitation associated with this system, combined with seasonal temperatures over the next several days, will limit fuel concerns across the northern/northeastern CONUS. A breakdown of the upper ridge over the central U.S. will transition into a more zonal flow regime over this weekend. As this occurs, increasing west/southwesterly mid-level flow - augmented by transient shortwave troughs - may promote areas of dry/windy conditions in the lee of the southern Rockies. Additionally, a dry return flow regime may become established across the southern Plains this weekend as a lee trough deepens along the High Plains; however, recent widespread rainfall should limit fuel status. This regime will be short-lived as cold air intrusions overspread the Plains behind a deepening surface low during the early to mid-week period. Recent precipitation, cool temperatures, and weak gradient winds should limit fire concerns across the western CONUS. ..Moore.. 11/21/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0316 PM CST Thu Nov 21 2024 Valid 231200Z - 291200Z Fire weather concerns remain limited through the extended period. The upper trough over the Great Lakes/Ohio River Valley will continue to promote widespread rain/snow chances across these regions and into the Northeast over the next 48 hours. The precipitation associated with this system, combined with seasonal temperatures over the next several days, will limit fuel concerns across the northern/northeastern CONUS. A breakdown of the upper ridge over the central U.S. will transition into a more zonal flow regime over this weekend. As this occurs, increasing west/southwesterly mid-level flow - augmented by transient shortwave troughs - may promote areas of dry/windy conditions in the lee of the southern Rockies. Additionally, a dry return flow regime may become established across the southern Plains this weekend as a lee trough deepens along the High Plains; however, recent widespread rainfall should limit fuel status. This regime will be short-lived as cold air intrusions overspread the Plains behind a deepening surface low during the early to mid-week period. Recent precipitation, cool temperatures, and weak gradient winds should limit fire concerns across the western CONUS. ..Moore.. 11/21/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0316 PM CST Thu Nov 21 2024 Valid 231200Z - 291200Z Fire weather concerns remain limited through the extended period. The upper trough over the Great Lakes/Ohio River Valley will continue to promote widespread rain/snow chances across these regions and into the Northeast over the next 48 hours. The precipitation associated with this system, combined with seasonal temperatures over the next several days, will limit fuel concerns across the northern/northeastern CONUS. A breakdown of the upper ridge over the central U.S. will transition into a more zonal flow regime over this weekend. As this occurs, increasing west/southwesterly mid-level flow - augmented by transient shortwave troughs - may promote areas of dry/windy conditions in the lee of the southern Rockies. Additionally, a dry return flow regime may become established across the southern Plains this weekend as a lee trough deepens along the High Plains; however, recent widespread rainfall should limit fuel status. This regime will be short-lived as cold air intrusions overspread the Plains behind a deepening surface low during the early to mid-week period. Recent precipitation, cool temperatures, and weak gradient winds should limit fire concerns across the western CONUS. ..Moore.. 11/21/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0144 PM CST Thu Nov 21 2024 Valid 212000Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...Synopsis... A line of convective rain/show showers continues across the Appalachians with occasional lightning flashes. This will persist for a few more hours before weakening late this afternoon as the boundary layer cools and low-level lapse rates weaken. Lightning is expected to remain offshore near the New England coast and the Pacific Northwest coast and therefore, the thunder line has been removed from both areas. ..Bentley.. 11/21/2024 .PREV DISCUSSION... /ISSUED 1029 AM CST Thu Nov 21 2024/ ...Synopsis... A deep midlevel low, characterized by 500-mb temperatures around -32C, will move from the Great Lakes into the Mid-Atlantic through the period. These cold midlevel temperatures and strong height falls accompanying the midlevel low may promote isolated lightning flashes embedded in showers across the central Appalachians this afternoon. Over coastal southern New England, low-level warm advection north of a related occluded surface low will also support isolated thunderstorms, given weak elevated instability. Most of this activity should remain offshore. Isolated thunderstorms are also possible over immediate coastal areas of WA, where forcing for ascent in the left exit region of a jet streak is overlapping deep tropospheric moisture/weak instability. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0144 PM CST Thu Nov 21 2024 Valid 212000Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...Synopsis... A line of convective rain/show showers continues across the Appalachians with occasional lightning flashes. This will persist for a few more hours before weakening late this afternoon as the boundary layer cools and low-level lapse rates weaken. Lightning is expected to remain offshore near the New England coast and the Pacific Northwest coast and therefore, the thunder line has been removed from both areas. ..Bentley.. 11/21/2024 .PREV DISCUSSION... /ISSUED 1029 AM CST Thu Nov 21 2024/ ...Synopsis... A deep midlevel low, characterized by 500-mb temperatures around -32C, will move from the Great Lakes into the Mid-Atlantic through the period. These cold midlevel temperatures and strong height falls accompanying the midlevel low may promote isolated lightning flashes embedded in showers across the central Appalachians this afternoon. Over coastal southern New England, low-level warm advection north of a related occluded surface low will also support isolated thunderstorms, given weak elevated instability. Most of this activity should remain offshore. Isolated thunderstorms are also possible over immediate coastal areas of WA, where forcing for ascent in the left exit region of a jet streak is overlapping deep tropospheric moisture/weak instability. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0144 PM CST Thu Nov 21 2024 Valid 212000Z - 221200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not expected through tonight. ...Synopsis... A line of convective rain/show showers continues across the Appalachians with occasional lightning flashes. This will persist for a few more hours before weakening late this afternoon as the boundary layer cools and low-level lapse rates weaken. Lightning is expected to remain offshore near the New England coast and the Pacific Northwest coast and therefore, the thunder line has been removed from both areas. ..Bentley.. 11/21/2024 .PREV DISCUSSION... /ISSUED 1029 AM CST Thu Nov 21 2024/ ...Synopsis... A deep midlevel low, characterized by 500-mb temperatures around -32C, will move from the Great Lakes into the Mid-Atlantic through the period. These cold midlevel temperatures and strong height falls accompanying the midlevel low may promote isolated lightning flashes embedded in showers across the central Appalachians this afternoon. Over coastal southern New England, low-level warm advection north of a related occluded surface low will also support isolated thunderstorms, given weak elevated instability. Most of this activity should remain offshore. Isolated thunderstorms are also possible over immediate coastal areas of WA, where forcing for ascent in the left exit region of a jet streak is overlapping deep tropospheric moisture/weak instability. Read more