Aggregator

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0639 PM CST Tue Jan 21 2025 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across the U.S. tonight. ...01Z Update... Generally dry and/or stable conditions prevail across much of the nation. East of the Rockies, downslope warming has contribute to some moderation of temperatures across the northern and central Great Plains. Otherwise, cold surface ridging remains entrenched across the southern Great Plains and Gulf Basin through much of the Atlantic Seaboard and offshore Atlantic waters. The surface front near the shallow leading edge of this air mass did shift back inland across the mid/upper Florida Keys and southeastern Florida coastal areas. However, models indicate that warm/dry layers aloft (evident in 22/00Z observed soundings) will suppress deep convective development rooted within weak boundary-layer instability, before the front advances back across and offshore of coastal areas later tonight, in the wake of a developing frontal wave across the southwestern Atlantic. ..Kerr.. 01/22/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0639 PM CST Tue Jan 21 2025 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across the U.S. tonight. ...01Z Update... Generally dry and/or stable conditions prevail across much of the nation. East of the Rockies, downslope warming has contribute to some moderation of temperatures across the northern and central Great Plains. Otherwise, cold surface ridging remains entrenched across the southern Great Plains and Gulf Basin through much of the Atlantic Seaboard and offshore Atlantic waters. The surface front near the shallow leading edge of this air mass did shift back inland across the mid/upper Florida Keys and southeastern Florida coastal areas. However, models indicate that warm/dry layers aloft (evident in 22/00Z observed soundings) will suppress deep convective development rooted within weak boundary-layer instability, before the front advances back across and offshore of coastal areas later tonight, in the wake of a developing frontal wave across the southwestern Atlantic. ..Kerr.. 01/22/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0639 PM CST Tue Jan 21 2025 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across the U.S. tonight. ...01Z Update... Generally dry and/or stable conditions prevail across much of the nation. East of the Rockies, downslope warming has contribute to some moderation of temperatures across the northern and central Great Plains. Otherwise, cold surface ridging remains entrenched across the southern Great Plains and Gulf Basin through much of the Atlantic Seaboard and offshore Atlantic waters. The surface front near the shallow leading edge of this air mass did shift back inland across the mid/upper Florida Keys and southeastern Florida coastal areas. However, models indicate that warm/dry layers aloft (evident in 22/00Z observed soundings) will suppress deep convective development rooted within weak boundary-layer instability, before the front advances back across and offshore of coastal areas later tonight, in the wake of a developing frontal wave across the southwestern Atlantic. ..Kerr.. 01/22/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0639 PM CST Tue Jan 21 2025 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across the U.S. tonight. ...01Z Update... Generally dry and/or stable conditions prevail across much of the nation. East of the Rockies, downslope warming has contribute to some moderation of temperatures across the northern and central Great Plains. Otherwise, cold surface ridging remains entrenched across the southern Great Plains and Gulf Basin through much of the Atlantic Seaboard and offshore Atlantic waters. The surface front near the shallow leading edge of this air mass did shift back inland across the mid/upper Florida Keys and southeastern Florida coastal areas. However, models indicate that warm/dry layers aloft (evident in 22/00Z observed soundings) will suppress deep convective development rooted within weak boundary-layer instability, before the front advances back across and offshore of coastal areas later tonight, in the wake of a developing frontal wave across the southwestern Atlantic. ..Kerr.. 01/22/2025 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0639 PM CST Tue Jan 21 2025 Valid 220100Z - 221200Z ...NO THUNDERSTORM AREAS FORECAST... ...SUMMARY... The risk for thunderstorms appears negligible across the U.S. tonight. ...01Z Update... Generally dry and/or stable conditions prevail across much of the nation. East of the Rockies, downslope warming has contribute to some moderation of temperatures across the northern and central Great Plains. Otherwise, cold surface ridging remains entrenched across the southern Great Plains and Gulf Basin through much of the Atlantic Seaboard and offshore Atlantic waters. The surface front near the shallow leading edge of this air mass did shift back inland across the mid/upper Florida Keys and southeastern Florida coastal areas. However, models indicate that warm/dry layers aloft (evident in 22/00Z observed soundings) will suppress deep convective development rooted within weak boundary-layer instability, before the front advances back across and offshore of coastal areas later tonight, in the wake of a developing frontal wave across the southwestern Atlantic. ..Kerr.. 01/22/2025 Read more

No watches are valid as of Tue Jan 21 23:51:02 UTC 2025.

MD 0052 CONCERNING HEAVY SNOW FOR FAR SOUTHEAST LOUISIANA...FAR SOUTHERN MISSISSIPPI...FAR SOUTHERN ALABAMA...FLORIDA PANHANDLE
Mesoscale Discussion 0052 NWS Storm Prediction Center Norman OK 0452 PM CST Tue Jan 21 2025 Areas affected...Far Southeast Louisiana...Far Southern Mississippi...Far Southern Alabama...Florida Panhandle Concerning...Heavy snow Valid 212252Z - 220445Z SUMMARY...Heavy snow will be likely over the next few hours along parts of the central Gulf Coast from far southeast Louisiana into the Florida Panhandle and southern Alabama. Snowfall rates are expected to exceed 1 inch per hour within the heaviest parts of the band. DISCUSSION...Water vapor imagery shows a mid-level trough from the Ohio Valley extending southwestward into the lower Mississippi Valley. A powerful mid-level jet of 100 to 140 knots is located to the east of the trough, with the exit region of this jet located in the central Gulf Coast region. Widespread precipitation is ongoing beneath this feature (where lift is strong) from far southeast Louisiana east-northeastward into the Florida Panhandle and southern Alabama. Most of the precipitation is in the form of snow, with some reports of heavy snow. The latest model forecasts suggest that a band of strong isentropic ascent will continue to spread eastward across the central Gulf Coast region, making conditions favorable for heavy snow over the next few hours. Snowfall rates are expected to exceed 1 inch per hour in some locations. The potential for heavy snow is expected to continue into early to mid evening over southern Alabama and the Florida Panhandle. Further to the west, snowfall rates should gradually decrease over parts of far southeast Louisiana and southern Mississippi. ..Broyles/Smith.. 01/21/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TAE...BMX...MOB...LIX... LAT...LON 31968552 31388505 30768485 30258490 29918518 29958587 30098666 30118728 29978839 29728905 29538948 29508972 29708985 29978979 30298952 30718851 31188774 32058650 31968552 Read more

MD 0051 CONCERNING HEAVY SNOW FOR PORTIONS OF SOUTHERN GA AND NORTHERN FL
Mesoscale Discussion 0051 NWS Storm Prediction Center Norman OK 0354 PM CST Tue Jan 21 2025 Areas affected...portions of southern GA and northern FL Concerning...Heavy snow Valid 212154Z - 220400Z SUMMARY...Wintry precipitation to the west and north should gradually expand in coverage and intensity over portions of southern GA and northern FL late this afternoon and evening. An initial wintry mix of snow, sleet and freezing rain will be possible before heavy snow, with rates near 1 in/hr, develops this evening. DISCUSSION...As of 2140 UTC, regional radar analysis showed a broad area of winter precipitation ongoing over much of the northern Gulf Coast and Southeast. A band of moderate snow was also expanding over portions of south-central GA. So far, temperatures have remained above freezing over portions of southern GA and northern FL. Strong cold advection from upstream stations in the mid to low 20s F should support a continued cooling trend through the remainder of the afternoon and into this evening. Columnar cooling will be further aided by rapid moistening as deep-layer ascent increases with the approach of the main precipitation shield. This should result in temperatures falling to near or below freezing in the next couple of hours, concurrent with the onset of precipitation from heavier banding to the north and west. As precipitation rates intensify, an initial wintry mix of sleet and freezing rain will develop from southwest to northeast. This should be followed by a relatively fast transition to all snow from the far eastern FL Panhandle and across southern GA between 23-02z. Strong frontogenetic response in the 850-700 mb layer and rapidly cooling temperatures may support snowfall rates near 1"/hr for a few hours as snow gradually expands northeastward through the evening hours. ..Lyons.. 01/21/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CHS...CAE...JAX...FFC...TAE... LAT...LON 30088437 30198306 31128159 31988108 32488132 32928181 33008217 32508404 31498515 30518497 30088437 Read more

MD 0050 CONCERNING HEAVY SNOW FOR SOUTHERN MISSISSIPPI...SOUTHERN ALABAMA...AND THE WESTERN FLORIDA PANHANDLE
Mesoscale Discussion 0050 NWS Storm Prediction Center Norman OK 0203 PM CST Tue Jan 21 2025 Areas affected...southern Mississippi...southern Alabama...and the western Florida Panhandle Concerning...Heavy snow Valid 212003Z - 212300Z SUMMARY...Moderate to heavy snow will continue through the afternoon. DISCUSSION...A broad area of snow continues to shift east and northeast into portions of southern Alabama and the Florida Panhandle from Louisiana/southern Mississippi. Occasional sleet and freezing rain reports have occurred across the coast, but the main precipitation type has become snow area wide. Enhanced upper-level flow and 925-850 mb frontegenetic forcing are aiding in moderate to heavy snow production across these regions. Heavy snow observations have been reported from Gulfport, MS to Mobile, AL and into portions of southeastern Alabama over the last hour with visibility dropping to 1/4-1/2 mile. Guidance suggests snowfall rates may occasionally approach 1"/hr across southern Alabama near the Florida state line over the next 1-3 hours before tapering off later this evening as upper-level support shifts northward. ..Thornton.. 01/21/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TAE...BMX...MOB...LIX... LAT...LON 30808926 31278793 31768651 31768557 31218510 31028522 30748608 30478665 30218854 30318931 30808926 Read more

SPC Day 3-8 Fire Weather Outlook
Day 3-8 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...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 0402 PM CST Tue Jan 21 2025 Valid 231200Z - 291200Z ...Day 3/Thursday - Southern California... A shortwave trough will advance southeastward from the Four Corners region into the southern Plains, while a midlevel ridge gradually deamplifies over the West Coast. As a result, surface high pressure will persist across the Intermountain West, favoring dry/windy offshore flow across much of southern CA. Sustained surface winds of 20+ mph (with higher gusts) will coincide with single-digit to lower teens RH into Day 3/Thursday afternoon. Given very dry fuels, critical fire-weather conditions are expected. The pressure gradient will weaken substantially by Day 4/Friday, though dry conditions will persist -- with locally breezy/gusty winds still possible over terrain-favored areas. By Day 5/Saturday, onshore flow and the potential for rain will overspread southern CA, reducing the overall fire-weather risk. ...Southwest and Southern Plains... On Day 3/Thursday, dry/breezy conditions are expected across portions of southern/central AZ -- along the southern periphery of the expansive surface high pressure. While elevated fire-weather conditions are possible, critical conditions are not currently expected. On Day 4/Friday, dry/breezy pre-frontal conditions will develop across the southern Plains, as westerly flow strengthens across the southern Rockies. Current indications are that marginal fuels will keep any fire-weather concerns localized. Dry/windy conditions are once again expected across the Southwest on Day 5/Saturday -- ahead of a strong midlevel trough moving across the southern Great Basin. However, fuels do not appear supportive of Critical probabilities at this time. ..Weinman.. 01/21/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

MD 0049 CONCERNING HEAVY SNOW FOR SOUTHERN JEFFERSON AND NORTHERN LEWIS COUNTIES DOWNSTREAM OF LAKE ONTARIO
Mesoscale Discussion 0049 NWS Storm Prediction Center Norman OK 1028 AM CST Tue Jan 21 2025 Areas affected...Southern Jefferson and northern Lewis counties downstream of Lake Ontario Concerning...Heavy snow Valid 211628Z - 212230Z SUMMARY...Heavy lake-effect snow to continue downstream of Lake Ontario to continue for another 10 to 12 hours. Snowfall rates of 2+ inches per hour expected. DISCUSSION...A strong lake-effect snow band which developed yesterday evening and slowly shifted north has now stalled over the same location since around 10Z this morning with snowfall rates in excess of 2 inches per hour. Forecast soundings show a similar wind direction and EL depth which should support similar intensity through at least 00Z. After this time, winds become more erratic and the depth of the convective layer will become more shallow which will likely result in a weaker, more erratic snow band. However, until that time, 2+ inch per hour snowfall rates are expected to persist through the afternoon and into the early evening across the same area across southern Jefferson and northern Lewis counties. ..Bentley.. 01/21/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BUF... LAT...LON 43947628 44037579 44007543 43897536 43767560 43717592 43697613 43707625 43847635 43947628 Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0158 PM CST Tue Jan 21 2025 Valid 221200Z - 231200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... The Critical highlights were expanded to the Malibu Coast vicinity, and nudged westward toward the coast in southern Orange County and San Diego County with this update. For both areas, the latest high-resolution guidance is in good agreement, depicting 20+ mph sustained east-northeasterly surface winds (with higher gusts) amid single-digit to lower teens RH. The strongest winds are currently expected Wednesday night into Day 3/Thursday. For additional details, see the previous discussion below. ..Weinman.. 01/21/2025 .PREV DISCUSSION... /ISSUED 0157 AM CST Tue Jan 21 2025/ ...Synopsis... A surface pressure gradient will persist across southern California, with some strengthening of the gradient likely by late Wednesday afternoon as another in a series of mid-level troughs overspread the Great Basin tomorrow (Wednesday). Another day of offshore flow capable of supporting rapid wildfire spread is expected. By afternoon peak heating, widespread sustained 20-30 mph wind speeds are likely, along with RH dropping to at least the 10-15 percent range. Locally higher wind speeds/gusts are also likely in terrain-favoring areas. Anywhere from the Ventura Valley region to the Laguna Mountains may experience the aforementioned meteorological surface conditions, necessitating the introduction of Critical fire weather highlights this outlook. ...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 0158 PM CST Tue Jan 21 2025 Valid 221200Z - 231200Z ...CRITICAL FIRE WEATHER AREA FOR MUCH OF SOUTHERN CALIFORNIA... The Critical highlights were expanded to the Malibu Coast vicinity, and nudged westward toward the coast in southern Orange County and San Diego County with this update. For both areas, the latest high-resolution guidance is in good agreement, depicting 20+ mph sustained east-northeasterly surface winds (with higher gusts) amid single-digit to lower teens RH. The strongest winds are currently expected Wednesday night into Day 3/Thursday. For additional details, see the previous discussion below. ..Weinman.. 01/21/2025 .PREV DISCUSSION... /ISSUED 0157 AM CST Tue Jan 21 2025/ ...Synopsis... A surface pressure gradient will persist across southern California, with some strengthening of the gradient likely by late Wednesday afternoon as another in a series of mid-level troughs overspread the Great Basin tomorrow (Wednesday). Another day of offshore flow capable of supporting rapid wildfire spread is expected. By afternoon peak heating, widespread sustained 20-30 mph wind speeds are likely, along with RH dropping to at least the 10-15 percent range. Locally higher wind speeds/gusts are also likely in terrain-favoring areas. Anywhere from the Ventura Valley region to the Laguna Mountains may experience the aforementioned meteorological surface conditions, necessitating the introduction of Critical fire weather highlights this outlook. ...Please see www.spc.noaa.gov/fire for graphic product... Read more