Severe Storms

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1017 AM CST Mon Dec 18 2023 Valid 181700Z - 191200Z ...NO CRITICAL AREAS... No changes. Cool temperatures and abundant precipitation will keep fire-weather conditions minimal over much of the CONUS. ..Lyons.. 12/18/2023 .PREV DISCUSSION... /ISSUED 0146 AM CST Mon Dec 18 2023/ ...Synopsis... A mid-level trough will amplify along the East Coast as a second mid-level trough impinges on California, with abundant rainfall expected in both regions today. Meanwhile, surface high pressure and associated cooler air will overspread the central CONUS. The net result will be quiescent fire weather conditions across the U.S., especially considering that fuels will be poorly receptive to wildfire spread for many locales. ...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 1017 AM CST Mon Dec 18 2023 Valid 181700Z - 191200Z ...NO CRITICAL AREAS... No changes. Cool temperatures and abundant precipitation will keep fire-weather conditions minimal over much of the CONUS. ..Lyons.. 12/18/2023 .PREV DISCUSSION... /ISSUED 0146 AM CST Mon Dec 18 2023/ ...Synopsis... A mid-level trough will amplify along the East Coast as a second mid-level trough impinges on California, with abundant rainfall expected in both regions today. Meanwhile, surface high pressure and associated cooler air will overspread the central CONUS. The net result will be quiescent fire weather conditions across the U.S., especially considering that fuels will be poorly receptive to wildfire spread for many locales. ...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 1017 AM CST Mon Dec 18 2023 Valid 181700Z - 191200Z ...NO CRITICAL AREAS... No changes. Cool temperatures and abundant precipitation will keep fire-weather conditions minimal over much of the CONUS. ..Lyons.. 12/18/2023 .PREV DISCUSSION... /ISSUED 0146 AM CST Mon Dec 18 2023/ ...Synopsis... A mid-level trough will amplify along the East Coast as a second mid-level trough impinges on California, with abundant rainfall expected in both regions today. Meanwhile, surface high pressure and associated cooler air will overspread the central CONUS. The net result will be quiescent fire weather conditions across the U.S., especially considering that fuels will be poorly receptive to wildfire spread for many locales. ...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 1017 AM CST Mon Dec 18 2023 Valid 181700Z - 191200Z ...NO CRITICAL AREAS... No changes. Cool temperatures and abundant precipitation will keep fire-weather conditions minimal over much of the CONUS. ..Lyons.. 12/18/2023 .PREV DISCUSSION... /ISSUED 0146 AM CST Mon Dec 18 2023/ ...Synopsis... A mid-level trough will amplify along the East Coast as a second mid-level trough impinges on California, with abundant rainfall expected in both regions today. Meanwhile, surface high pressure and associated cooler air will overspread the central CONUS. The net result will be quiescent fire weather conditions across the U.S., especially considering that fuels will be poorly receptive to wildfire spread for many locales. ...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 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1013 AM CST Mon Dec 18 2023 Valid 181630Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN NEW ENGLAND... ...SUMMARY... Convectively enhanced wind gusts will affect southeastern New England this afternoon. ...Southeastern New England.. A narrow/forced band of convection is moving quickly eastward across southeastern Massachusetts and Rhode Island at this time, immediately ahead of a strong, northeastward-moving mid-level vort max depicted by water vapor imagery just south of Long Island. While cool surface temperatures have prohibited surface-based instability in most areas, a small area of warmer (low 60s) boundary layer is indicated over far southeastern New England (southeast Massachusetts). As such, minor enhancement of the intensity of the convective band may occur over the next couple of hours, possibly resulting in some mechanical downward transport of intense low-level flow observed across this area. This could result in gusts slightly above the already above-severe level gradient gusts that are ongoing, until convection moves offshore later this afternoon. For additional short-term information, please refer to SWOMCD #2337. ...California... Thunderstorms associated with an inland-moving eastern Pacific short-wave trough have diminished across California, but a few additional lightning flashes remain possible this afternoon/ evening. ..Goss/Thornton.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0655 AM CST Mon Dec 18 2023 Valid 181300Z - 191200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ALONG PARTS OF COASTAL NEW JERSEY AND SOUTHERN NEW ENGLAND... ...SUMMARY... Thunderstorms associated with marginally severe wind gusts will be possible today from near the coast of New Jersey into southern New England. ...Coastal New Jersey/Southern New England... A strong upper-level system over the Great Lakes will move toward the central Appalachians today. Ahead of the system, a lead shortwave trough and an associated deepening surface low will move northward across the Northeast. A cold front near the Mid-Atlantic coast will move eastward into the near-coastal waters with a somewhat moist airmass located head of the front extending northward across southern New England. A few thunderstorms will be possible ahead of the front within this weak instability. An impressive 80 to 100 knot low-level jet will move northward across New England today. Storms that develop across southern New England could have an isolated wind-damage threat, as the stronger convection potentially helps to mix winds toward the surface. However, due to very weak instability, any threat is expected to remain marginal this morning and afternoon. ..Broyles/Thompson.. 12/18/2023 Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0343 AM CST Mon Dec 18 2023 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range guidance continues to suggest that a southern-stream shortwave trough will progress through the southern Plains on D4/Thursday and the Lower MS Valley on D5/Friday. Modest low-level moisture advection will precede this shortwave, supporting showers and isolated thunderstorms. However, overall buoyancy will be limited by warm mid-level temperatures, which should keep the severe potential low. Upper low expected to be off the southern California coast early D4/Thursday is forecast progress eastward across the Southwest/northern Mexico in the wave of the lead southern-stream shortwave, likely reaching the southern High Plains by D6/Saturday. Modest low-level moisture will still be in place across the southern Plains, and this wave should be accompanied by stronger large-scale forcing for ascent and colder mid-level temperatures. This should result in greater buoyancy than with the preceding wave, which may lend itself to stronger thunderstorms. However, timing of this wave remains uncertain, with the amount of overlap between the strongest shear and better buoyancy uncertain as well. These factors limit predictability and overall forecast confidence. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0343 AM CST Mon Dec 18 2023 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range guidance continues to suggest that a southern-stream shortwave trough will progress through the southern Plains on D4/Thursday and the Lower MS Valley on D5/Friday. Modest low-level moisture advection will precede this shortwave, supporting showers and isolated thunderstorms. However, overall buoyancy will be limited by warm mid-level temperatures, which should keep the severe potential low. Upper low expected to be off the southern California coast early D4/Thursday is forecast progress eastward across the Southwest/northern Mexico in the wave of the lead southern-stream shortwave, likely reaching the southern High Plains by D6/Saturday. Modest low-level moisture will still be in place across the southern Plains, and this wave should be accompanied by stronger large-scale forcing for ascent and colder mid-level temperatures. This should result in greater buoyancy than with the preceding wave, which may lend itself to stronger thunderstorms. However, timing of this wave remains uncertain, with the amount of overlap between the strongest shear and better buoyancy uncertain as well. These factors limit predictability and overall forecast confidence. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0343 AM CST Mon Dec 18 2023 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range guidance continues to suggest that a southern-stream shortwave trough will progress through the southern Plains on D4/Thursday and the Lower MS Valley on D5/Friday. Modest low-level moisture advection will precede this shortwave, supporting showers and isolated thunderstorms. However, overall buoyancy will be limited by warm mid-level temperatures, which should keep the severe potential low. Upper low expected to be off the southern California coast early D4/Thursday is forecast progress eastward across the Southwest/northern Mexico in the wave of the lead southern-stream shortwave, likely reaching the southern High Plains by D6/Saturday. Modest low-level moisture will still be in place across the southern Plains, and this wave should be accompanied by stronger large-scale forcing for ascent and colder mid-level temperatures. This should result in greater buoyancy than with the preceding wave, which may lend itself to stronger thunderstorms. However, timing of this wave remains uncertain, with the amount of overlap between the strongest shear and better buoyancy uncertain as well. These factors limit predictability and overall forecast confidence. Read more

Day 4-8 Outlook
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0343 AM CST Mon Dec 18 2023 Valid 211200Z - 261200Z ...DISCUSSION... Medium-range guidance continues to suggest that a southern-stream shortwave trough will progress through the southern Plains on D4/Thursday and the Lower MS Valley on D5/Friday. Modest low-level moisture advection will precede this shortwave, supporting showers and isolated thunderstorms. However, overall buoyancy will be limited by warm mid-level temperatures, which should keep the severe potential low. Upper low expected to be off the southern California coast early D4/Thursday is forecast progress eastward across the Southwest/northern Mexico in the wave of the lead southern-stream shortwave, likely reaching the southern High Plains by D6/Saturday. Modest low-level moisture will still be in place across the southern Plains, and this wave should be accompanied by stronger large-scale forcing for ascent and colder mid-level temperatures. This should result in greater buoyancy than with the preceding wave, which may lend itself to stronger thunderstorms. However, timing of this wave remains uncertain, with the amount of overlap between the strongest shear and better buoyancy uncertain as well. These factors limit predictability and overall forecast confidence. Read more