Severe Storms

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0634 PM CST Thu Dec 28 2023 Valid 290100Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk of thunderstorms appears negligible across the U.S. through tonight. ...01Z Update... A large, vigorous short wave trough has emerged from a strong, zonal mid/upper jet extending across the southern mid-latitude western through central Pacific. However, models suggest that this feature, and an associated surface cyclone, will slowly begin to weaken while gradually progressing across the eastern mid-latitude Pacific, toward the Pacific coast, through 12Z Friday. With the leading edge of the stronger mid-level cooling forecast to remain well offshore through the remainder of this period (and generally not forecast to reach Oregon/California coastal areas until tomorrow evening), appreciable boundary-layer destabilization appears unlikely. Models do suggest that lower/mid-tropospheric warm advection and moistening may contribute to an inland spreading band of weak elevated destabilization across northern California and southern Oregon coastal areas around or after 29/08-10Z. However, a combination of weak mid/upper forcing for upward vertical motion and relatively warm layers aloft appear to preclude an appreciable risk for convection capable of producing lightning. ..Kerr.. 12/29/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0634 PM CST Thu Dec 28 2023 Valid 290100Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk of thunderstorms appears negligible across the U.S. through tonight. ...01Z Update... A large, vigorous short wave trough has emerged from a strong, zonal mid/upper jet extending across the southern mid-latitude western through central Pacific. However, models suggest that this feature, and an associated surface cyclone, will slowly begin to weaken while gradually progressing across the eastern mid-latitude Pacific, toward the Pacific coast, through 12Z Friday. With the leading edge of the stronger mid-level cooling forecast to remain well offshore through the remainder of this period (and generally not forecast to reach Oregon/California coastal areas until tomorrow evening), appreciable boundary-layer destabilization appears unlikely. Models do suggest that lower/mid-tropospheric warm advection and moistening may contribute to an inland spreading band of weak elevated destabilization across northern California and southern Oregon coastal areas around or after 29/08-10Z. However, a combination of weak mid/upper forcing for upward vertical motion and relatively warm layers aloft appear to preclude an appreciable risk for convection capable of producing lightning. ..Kerr.. 12/29/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0634 PM CST Thu Dec 28 2023 Valid 290100Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk of thunderstorms appears negligible across the U.S. through tonight. ...01Z Update... A large, vigorous short wave trough has emerged from a strong, zonal mid/upper jet extending across the southern mid-latitude western through central Pacific. However, models suggest that this feature, and an associated surface cyclone, will slowly begin to weaken while gradually progressing across the eastern mid-latitude Pacific, toward the Pacific coast, through 12Z Friday. With the leading edge of the stronger mid-level cooling forecast to remain well offshore through the remainder of this period (and generally not forecast to reach Oregon/California coastal areas until tomorrow evening), appreciable boundary-layer destabilization appears unlikely. Models do suggest that lower/mid-tropospheric warm advection and moistening may contribute to an inland spreading band of weak elevated destabilization across northern California and southern Oregon coastal areas around or after 29/08-10Z. However, a combination of weak mid/upper forcing for upward vertical motion and relatively warm layers aloft appear to preclude an appreciable risk for convection capable of producing lightning. ..Kerr.. 12/29/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0634 PM CST Thu Dec 28 2023 Valid 290100Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk of thunderstorms appears negligible across the U.S. through tonight. ...01Z Update... A large, vigorous short wave trough has emerged from a strong, zonal mid/upper jet extending across the southern mid-latitude western through central Pacific. However, models suggest that this feature, and an associated surface cyclone, will slowly begin to weaken while gradually progressing across the eastern mid-latitude Pacific, toward the Pacific coast, through 12Z Friday. With the leading edge of the stronger mid-level cooling forecast to remain well offshore through the remainder of this period (and generally not forecast to reach Oregon/California coastal areas until tomorrow evening), appreciable boundary-layer destabilization appears unlikely. Models do suggest that lower/mid-tropospheric warm advection and moistening may contribute to an inland spreading band of weak elevated destabilization across northern California and southern Oregon coastal areas around or after 29/08-10Z. However, a combination of weak mid/upper forcing for upward vertical motion and relatively warm layers aloft appear to preclude an appreciable risk for convection capable of producing lightning. ..Kerr.. 12/29/2023 Read more

No Mesoscale Discussions are in effect as of Thu Dec 28 23:38:01 UTC 2023.

No watches are valid as of Thu Dec 28 23:38:01 UTC 2023.

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0351 PM CST Thu Dec 28 2023 Valid 301200Z - 051200Z Critical fire-weather conditions are not expected during the extended forecast period, though locally elevated conditions are possible over the southern High Plains on D4/Sunday. On D3/Saturday, a midlevel shortwave ridge will be in place over the southern Rockies, with enhanced west-northwest flow along the northern periphery of this feature. This will promote lee troughing/weak lee cyclogenesis and locally dry/breezy conditions across parts of the southern High Plains during the afternoon. Overall, a minimal overlap of dry/breezy conditions and marginal fuels should limit fire-weather concerns. Thereafter, a southern-stream jet max will track eastward from southern CA and overspread the southern Rockies on D4/Sunday. The strong westerly downslope flow will maintain a weak lee cyclone (ahead of an approaching cold front from the north) and favor dry/windy conditions across southeast NM into West TX. While locally elevated conditions are possible, marginal fuels should limit the potential for critical conditions. Elsewhere across the CONUS, fire-weather concerns appear minimal. ..Weinman.. 12/28/2023 ...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 0351 PM CST Thu Dec 28 2023 Valid 301200Z - 051200Z Critical fire-weather conditions are not expected during the extended forecast period, though locally elevated conditions are possible over the southern High Plains on D4/Sunday. On D3/Saturday, a midlevel shortwave ridge will be in place over the southern Rockies, with enhanced west-northwest flow along the northern periphery of this feature. This will promote lee troughing/weak lee cyclogenesis and locally dry/breezy conditions across parts of the southern High Plains during the afternoon. Overall, a minimal overlap of dry/breezy conditions and marginal fuels should limit fire-weather concerns. Thereafter, a southern-stream jet max will track eastward from southern CA and overspread the southern Rockies on D4/Sunday. The strong westerly downslope flow will maintain a weak lee cyclone (ahead of an approaching cold front from the north) and favor dry/windy conditions across southeast NM into West TX. While locally elevated conditions are possible, marginal fuels should limit the potential for critical conditions. Elsewhere across the CONUS, fire-weather concerns appear minimal. ..Weinman.. 12/28/2023 ...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 0351 PM CST Thu Dec 28 2023 Valid 301200Z - 051200Z Critical fire-weather conditions are not expected during the extended forecast period, though locally elevated conditions are possible over the southern High Plains on D4/Sunday. On D3/Saturday, a midlevel shortwave ridge will be in place over the southern Rockies, with enhanced west-northwest flow along the northern periphery of this feature. This will promote lee troughing/weak lee cyclogenesis and locally dry/breezy conditions across parts of the southern High Plains during the afternoon. Overall, a minimal overlap of dry/breezy conditions and marginal fuels should limit fire-weather concerns. Thereafter, a southern-stream jet max will track eastward from southern CA and overspread the southern Rockies on D4/Sunday. The strong westerly downslope flow will maintain a weak lee cyclone (ahead of an approaching cold front from the north) and favor dry/windy conditions across southeast NM into West TX. While locally elevated conditions are possible, marginal fuels should limit the potential for critical conditions. Elsewhere across the CONUS, fire-weather concerns appear minimal. ..Weinman.. 12/28/2023 ...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 0351 PM CST Thu Dec 28 2023 Valid 301200Z - 051200Z Critical fire-weather conditions are not expected during the extended forecast period, though locally elevated conditions are possible over the southern High Plains on D4/Sunday. On D3/Saturday, a midlevel shortwave ridge will be in place over the southern Rockies, with enhanced west-northwest flow along the northern periphery of this feature. This will promote lee troughing/weak lee cyclogenesis and locally dry/breezy conditions across parts of the southern High Plains during the afternoon. Overall, a minimal overlap of dry/breezy conditions and marginal fuels should limit fire-weather concerns. Thereafter, a southern-stream jet max will track eastward from southern CA and overspread the southern Rockies on D4/Sunday. The strong westerly downslope flow will maintain a weak lee cyclone (ahead of an approaching cold front from the north) and favor dry/windy conditions across southeast NM into West TX. While locally elevated conditions are possible, marginal fuels should limit the potential for critical conditions. Elsewhere across the CONUS, fire-weather concerns appear minimal. ..Weinman.. 12/28/2023 ...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 0351 PM CST Thu Dec 28 2023 Valid 301200Z - 051200Z Critical fire-weather conditions are not expected during the extended forecast period, though locally elevated conditions are possible over the southern High Plains on D4/Sunday. On D3/Saturday, a midlevel shortwave ridge will be in place over the southern Rockies, with enhanced west-northwest flow along the northern periphery of this feature. This will promote lee troughing/weak lee cyclogenesis and locally dry/breezy conditions across parts of the southern High Plains during the afternoon. Overall, a minimal overlap of dry/breezy conditions and marginal fuels should limit fire-weather concerns. Thereafter, a southern-stream jet max will track eastward from southern CA and overspread the southern Rockies on D4/Sunday. The strong westerly downslope flow will maintain a weak lee cyclone (ahead of an approaching cold front from the north) and favor dry/windy conditions across southeast NM into West TX. While locally elevated conditions are possible, marginal fuels should limit the potential for critical conditions. Elsewhere across the CONUS, fire-weather concerns appear minimal. ..Weinman.. 12/28/2023 ...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 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0147 PM CST Thu Dec 28 2023 Valid 282000Z - 291200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... No thunderstorms are forecast across the contiguous U.S. through tonight. Little if any lightning activity is expected across the CONUS through tonight, as the air mass dries over far southern FL and an upper trough approaches the West Coast late. While showers are expected into northern CA tonight, thunderstorms are unlikely through 12Z Friday. ..Jewell.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1011 AM CST Thu Dec 28 2023/ A large upper low remains over the mid MS Valley today, with dry and stable conditions over the nation. Thunderstorms that earlier occurred near the FL Keys have move eastward and away from the coast. Other thunderstorms may occur off the coast of southeast New England tonight. But no organized thunderstorms are expected over the CONUS today or tonight. Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1236 PM CST Thu Dec 28 2023 Valid 291200Z - 301200Z ...NO CRITICAL AREAS... The previous forecast (see below) remains on track, and no changes are needed with this update. ..Weinman.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1147 PM CST Wed Dec 27 2023/ ...Synopsis... Some moderately breezy conditions are possible across portions of the Mississippi Valley into the Southeast on Friday as the mid-level trough shifts eastward. However, temperatures will be cool and fuels remain moist across these areas. Therefore, fire weather concerns will be minimal. Elsewhere, moist fuels are present across most of the CONUS which precludes any fire-weather concerns. ...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 1236 PM CST Thu Dec 28 2023 Valid 291200Z - 301200Z ...NO CRITICAL AREAS... The previous forecast (see below) remains on track, and no changes are needed with this update. ..Weinman.. 12/28/2023 .PREV DISCUSSION... /ISSUED 1147 PM CST Wed Dec 27 2023/ ...Synopsis... Some moderately breezy conditions are possible across portions of the Mississippi Valley into the Southeast on Friday as the mid-level trough shifts eastward. However, temperatures will be cool and fuels remain moist across these areas. Therefore, fire weather concerns will be minimal. Elsewhere, moist fuels are present across most of the CONUS which precludes any fire-weather concerns. ...Please see www.spc.noaa.gov/fire for graphic product... Read more