Severe Storms

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0147 AM CST Sat Dec 23 2023 Valid 231200Z - 241200Z ...NO CRITICAL AREAS... ...Synopsis... A lee cyclone will develop in the central Plains today as a mid-level trough translates across the western CONUS and amplifies. This will bring some windy conditions to portions of the Southwest and the Southern and Central High Plains. However, this system will bring significant Pacific moisture and advect Gulf moisture northward as low-level flow strengthens. Therefore, relative humidity will remain quite high. In addition, fuels will be moist across the region with additional wetting rain expected. ..Bentley.. 12/23/2023 ...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 0147 AM CST Sat Dec 23 2023 Valid 231200Z - 241200Z ...NO CRITICAL AREAS... ...Synopsis... A lee cyclone will develop in the central Plains today as a mid-level trough translates across the western CONUS and amplifies. This will bring some windy conditions to portions of the Southwest and the Southern and Central High Plains. However, this system will bring significant Pacific moisture and advect Gulf moisture northward as low-level flow strengthens. Therefore, relative humidity will remain quite high. In addition, fuels will be moist across the region with additional wetting rain expected. ..Bentley.. 12/23/2023 ...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 0147 AM CST Sat Dec 23 2023 Valid 231200Z - 241200Z ...NO CRITICAL AREAS... ...Synopsis... A lee cyclone will develop in the central Plains today as a mid-level trough translates across the western CONUS and amplifies. This will bring some windy conditions to portions of the Southwest and the Southern and Central High Plains. However, this system will bring significant Pacific moisture and advect Gulf moisture northward as low-level flow strengthens. Therefore, relative humidity will remain quite high. In addition, fuels will be moist across the region with additional wetting rain expected. ..Bentley.. 12/23/2023 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1228 AM CST Sat Dec 23 2023 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorm potential appears low on Sunday. ...Southern Plains to Lower MS Valley... A shortwave upper trough will pivot east on Sunday from the southern Plains to the Lower MS Valley. At the surface, low pressure over OK/KS at the beginning of the period will weaken with time, becoming elongated from the Ozarks to LA by late afternoon into the evening. A line and/or cluster of thunderstorms will likely be ongoing Sunday morning from central/eastern OK southward into north and central TX. This activity will be occurring in a warm advection regime within deep-layer southwesterly flow ahead of the upper trough and an advancing surface cold front. A weakening low-level jet and south/southeasterly surface winds ahead of the line of convection will result in wind profiles typically favorable for low-level rotation. However, greater low-level shear/SRH and better quality low-level thermodynamics will likely be offset from one another. Forecast thermodynamic profiles indicate poor low-level lapse rates and at least pockets of weak inhibition Sunday morning. This will likely limit severe/low-end tornado potential across central into eastern TX during the morning hours. By afternoon, limited heating due to widespread cloudiness and precipitation will preclude stronger destabilization downstream toward the ArkLaTex and Sabine Valley. Any stronger instability will likely remain offshore the Upper Texas and LA coasts, and severe potential is expected to remain low. ..Leitman.. 12/23/2023 Read more

SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1228 AM CST Sat Dec 23 2023 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorm potential appears low on Sunday. ...Southern Plains to Lower MS Valley... A shortwave upper trough will pivot east on Sunday from the southern Plains to the Lower MS Valley. At the surface, low pressure over OK/KS at the beginning of the period will weaken with time, becoming elongated from the Ozarks to LA by late afternoon into the evening. A line and/or cluster of thunderstorms will likely be ongoing Sunday morning from central/eastern OK southward into north and central TX. This activity will be occurring in a warm advection regime within deep-layer southwesterly flow ahead of the upper trough and an advancing surface cold front. A weakening low-level jet and south/southeasterly surface winds ahead of the line of convection will result in wind profiles typically favorable for low-level rotation. However, greater low-level shear/SRH and better quality low-level thermodynamics will likely be offset from one another. Forecast thermodynamic profiles indicate poor low-level lapse rates and at least pockets of weak inhibition Sunday morning. This will likely limit severe/low-end tornado potential across central into eastern TX during the morning hours. By afternoon, limited heating due to widespread cloudiness and precipitation will preclude stronger destabilization downstream toward the ArkLaTex and Sabine Valley. Any stronger instability will likely remain offshore the Upper Texas and LA coasts, and severe potential is expected to remain low. ..Leitman.. 12/23/2023 Read more

SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1228 AM CST Sat Dec 23 2023 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorm potential appears low on Sunday. ...Southern Plains to Lower MS Valley... A shortwave upper trough will pivot east on Sunday from the southern Plains to the Lower MS Valley. At the surface, low pressure over OK/KS at the beginning of the period will weaken with time, becoming elongated from the Ozarks to LA by late afternoon into the evening. A line and/or cluster of thunderstorms will likely be ongoing Sunday morning from central/eastern OK southward into north and central TX. This activity will be occurring in a warm advection regime within deep-layer southwesterly flow ahead of the upper trough and an advancing surface cold front. A weakening low-level jet and south/southeasterly surface winds ahead of the line of convection will result in wind profiles typically favorable for low-level rotation. However, greater low-level shear/SRH and better quality low-level thermodynamics will likely be offset from one another. Forecast thermodynamic profiles indicate poor low-level lapse rates and at least pockets of weak inhibition Sunday morning. This will likely limit severe/low-end tornado potential across central into eastern TX during the morning hours. By afternoon, limited heating due to widespread cloudiness and precipitation will preclude stronger destabilization downstream toward the ArkLaTex and Sabine Valley. Any stronger instability will likely remain offshore the Upper Texas and LA coasts, and severe potential is expected to remain low. ..Leitman.. 12/23/2023 Read more

SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1228 AM CST Sat Dec 23 2023 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorm potential appears low on Sunday. ...Southern Plains to Lower MS Valley... A shortwave upper trough will pivot east on Sunday from the southern Plains to the Lower MS Valley. At the surface, low pressure over OK/KS at the beginning of the period will weaken with time, becoming elongated from the Ozarks to LA by late afternoon into the evening. A line and/or cluster of thunderstorms will likely be ongoing Sunday morning from central/eastern OK southward into north and central TX. This activity will be occurring in a warm advection regime within deep-layer southwesterly flow ahead of the upper trough and an advancing surface cold front. A weakening low-level jet and south/southeasterly surface winds ahead of the line of convection will result in wind profiles typically favorable for low-level rotation. However, greater low-level shear/SRH and better quality low-level thermodynamics will likely be offset from one another. Forecast thermodynamic profiles indicate poor low-level lapse rates and at least pockets of weak inhibition Sunday morning. This will likely limit severe/low-end tornado potential across central into eastern TX during the morning hours. By afternoon, limited heating due to widespread cloudiness and precipitation will preclude stronger destabilization downstream toward the ArkLaTex and Sabine Valley. Any stronger instability will likely remain offshore the Upper Texas and LA coasts, and severe potential is expected to remain low. ..Leitman.. 12/23/2023 Read more

SPC 0700Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1228 AM CST Sat Dec 23 2023 Valid 241200Z - 251200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorm potential appears low on Sunday. ...Southern Plains to Lower MS Valley... A shortwave upper trough will pivot east on Sunday from the southern Plains to the Lower MS Valley. At the surface, low pressure over OK/KS at the beginning of the period will weaken with time, becoming elongated from the Ozarks to LA by late afternoon into the evening. A line and/or cluster of thunderstorms will likely be ongoing Sunday morning from central/eastern OK southward into north and central TX. This activity will be occurring in a warm advection regime within deep-layer southwesterly flow ahead of the upper trough and an advancing surface cold front. A weakening low-level jet and south/southeasterly surface winds ahead of the line of convection will result in wind profiles typically favorable for low-level rotation. However, greater low-level shear/SRH and better quality low-level thermodynamics will likely be offset from one another. Forecast thermodynamic profiles indicate poor low-level lapse rates and at least pockets of weak inhibition Sunday morning. This will likely limit severe/low-end tornado potential across central into eastern TX during the morning hours. By afternoon, limited heating due to widespread cloudiness and precipitation will preclude stronger destabilization downstream toward the ArkLaTex and Sabine Valley. Any stronger instability will likely remain offshore the Upper Texas and LA coasts, and severe potential is expected to remain low. ..Leitman.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1141 PM CST Fri Dec 22 2023 Valid 231200Z - 241200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR THE SOUTHERN HIGH PLAINS... ...SUMMARY... Isolated severe thunderstorms are possible across parts of the southern High Plains, mainly this afternoon and evening. ...Southern High Plains... A large-scale mid- to upper-level trough will move east from the Great Basin/Desert Southwest into the central and southern Rockies and adjacent High Plains during the period. A lead mid-level speed max will move through the base of the larger-scale trough and overspread the southern High Plains during the afternoon/early evening. In the low levels, a developing cyclone over the central High Plains will aid in advecting moisture northward on southerly flow across the southern High Plains. Showers and isolated thunderstorms are possible across eastern NM and adjacent TX counties during the morning. Considerable cloud cover will act to partially inhibit heating and low-level lapse rates --especially with north extent-- will be limited as a result. Despite weak instability and model-derived MUCAPE 250-1000 J/kg, cool 500 mb temperatures (-16 to -18 deg C) may foster an environment with a few vigorous updrafts capable of a marginally severe hail risk with activity that develops during the afternoon. A mix of cells and bands of storms will likely transition to an extensive, broken squall line by the evening as it moves from the Caprock east into southwest OK and western north TX during the overnight. A tornado cannot be ruled out across parts of west TX during the afternoon, but this risk will likely be limited by the lack of stronger low-level shear and buoyancy. The aforementioned squall line will ingest increasingly elevated parcels with east extent across OK and western north TX and probably hinder the propensity for localized severe gusts with the convective line overnight. ..Smith/Bentley.. 12/23/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0657 PM CST Fri Dec 22 2023 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR SOUTHERN ARIZONA... ...SUMMARY... Isolated severe gusts are possible tonight across southern Arizona. ...Synopsis... Water-vapor imagery early this evening shows a mid-level low over the California/Mexico border and it will move east along the Arizona/Sonora border by early Saturday morning. Relatively cool mid-level temperatures (-22 deg C at 500 mb) were observed this evening on the 00z San Diego raob. These cool temperatures aloft are contributing to weak buoyancy across the Desert Southwest and are supporting episodic thunderstorm development. As deep-layer ascent spreads east across southern AZ this evening, a continuation of a forced convective band may continue to yield an isolated risk for localized severe gusts despite weak low-level lapse rates. Elsewhere, tranquil conditions exist across a large part of the remaining CONUS due in part to a surface ridge over the Gulf Coast and Eastern Seaboard. ..Smith.. 12/23/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0657 PM CST Fri Dec 22 2023 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR SOUTHERN ARIZONA... ...SUMMARY... Isolated severe gusts are possible tonight across southern Arizona. ...Synopsis... Water-vapor imagery early this evening shows a mid-level low over the California/Mexico border and it will move east along the Arizona/Sonora border by early Saturday morning. Relatively cool mid-level temperatures (-22 deg C at 500 mb) were observed this evening on the 00z San Diego raob. These cool temperatures aloft are contributing to weak buoyancy across the Desert Southwest and are supporting episodic thunderstorm development. As deep-layer ascent spreads east across southern AZ this evening, a continuation of a forced convective band may continue to yield an isolated risk for localized severe gusts despite weak low-level lapse rates. Elsewhere, tranquil conditions exist across a large part of the remaining CONUS due in part to a surface ridge over the Gulf Coast and Eastern Seaboard. ..Smith.. 12/23/2023 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0657 PM CST Fri Dec 22 2023 Valid 230100Z - 231200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FOR SOUTHERN ARIZONA... ...SUMMARY... Isolated severe gusts are possible tonight across southern Arizona. ...Synopsis... Water-vapor imagery early this evening shows a mid-level low over the California/Mexico border and it will move east along the Arizona/Sonora border by early Saturday morning. Relatively cool mid-level temperatures (-22 deg C at 500 mb) were observed this evening on the 00z San Diego raob. These cool temperatures aloft are contributing to weak buoyancy across the Desert Southwest and are supporting episodic thunderstorm development. As deep-layer ascent spreads east across southern AZ this evening, a continuation of a forced convective band may continue to yield an isolated risk for localized severe gusts despite weak low-level lapse rates. Elsewhere, tranquil conditions exist across a large part of the remaining CONUS due in part to a surface ridge over the Gulf Coast and Eastern Seaboard. ..Smith.. 12/23/2023 Read more

No watches are valid as of Fri Dec 22 22:31:02 UTC 2023.

No Mesoscale Discussions are in effect as of Fri Dec 22 22:31:02 UTC 2023.

MD 2339 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR SOUTHWEST AZ AND FAR SOUTHEAST CA
Mesoscale Discussion 2339 NWS Storm Prediction Center Norman OK 0231 PM CST Fri Dec 22 2023 Areas affected...Southwest AZ and far southeast CA Concerning...Severe potential...Watch unlikely Valid 222031Z - 222230Z Probability of Watch Issuance...5 percent SUMMARY...Small to marginally severe hail will be possible in the more robust storms this afternoon. Severe thunderstorm watch issuance is not expected. DISCUSSION...A trio of convective swaths persist downstream of a slow-moving mid/upper low just offshore of the CA/Baja CA border. The intermediate of these three swaths should largely impact the lower portions of the CO/Gila Rivers over the next few hours near the international border. Here, surface dew points from 54-58 F are common, with progressively lower values farther north along the CO River. Surface temperatures have largely struggled to warm beyond the 50s east of southeast CA owing to the pervasive cloudiness, but have popped into the low to mid 60s where cloud breaks have occurred. Still, MLCAPE has struggled to exceed 500 J/kg. The gradual eastward progression of the offshore low should yield slightly cooler mid-level temperatures into early evening, fostering a bit greater instability aloft. Although low-level shear is weak, VWP data from YUX highlights favorable speed shear between 3-6 km. This will conditionally support mid-level updraft rotation, especially in any cells that can remain semi-discrete. This potential alignment with the modest mid-level instability/buoyancy should support occasional hail growth with magnitudes likely peaking from 0.75-1.25 inch. ..Grams/Hart.. 12/22/2023 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TWC...PSR... LAT...LON 32541495 32761532 33061534 33441513 33601466 33471355 32981273 32651218 32201226 31831267 32541495 Read more