Severe Storms

WW 0639 Status Updates
STATUS REPORT ON WW 639 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE DEN TO 35 WNW AKO TO 30 NNE AKO TO 40 ENE SNY AND 30 WSW PUB TO 35 SSE ITR TO 45 NNW GLD TO 30 W AKO. ..HALBERT..08/20/24 ATTN...WFO...GLD...PUB...BOU...CYS... STATUS REPORT FOR WS 639 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC025-061-089-101-121-200340- CO . COLORADO COUNTIES INCLUDED ARE CROWLEY KIOWA OTERO PUEBLO WASHINGTON THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 639 SEVERE TSTM CO NE WY 191945Z - 200300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 639 NWS Storm Prediction Center Norman OK 145 PM MDT Mon Aug 19 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Eastern Colorado Nebraska Panhandle Southeast Wyoming * Effective this Monday afternoon and evening from 145 PM until 900 PM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Thunderstorms are expected to build eastward off the foothills of this afternoon, spreading across the watch area. The strongest storms will pose a risk of large hail and locally damaging wind gusts. The severe thunderstorm watch area is approximately along and 35 statute miles east and west of a line from 25 miles southeast of Pueblo CO to 20 miles northwest of Chadron NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU9). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24025. ...Hart Read more

WW 0640 Status Updates
STATUS REPORT ON WW 640 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SE GTF TO 35 SW GTF TO 10 ESE 3DU TO 50 NW SMN. ..GOSS..08/20/24 ATTN...WFO...MSO...TFX... STATUS REPORT FOR WS 640 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC013-015-027-029-035-039-041-045-047-049-051-063-073-077-081- 099-101-200340- MT . MONTANA COUNTIES INCLUDED ARE CASCADE CHOUTEAU FERGUS FLATHEAD GLACIER GRANITE HILL JUDITH BASIN LAKE LEWIS AND CLARK LIBERTY MISSOULA PONDERA POWELL RAVALLI TETON TOOLE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0640 Status Updates
STATUS REPORT ON WW 640 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SE GTF TO 35 SW GTF TO 10 ESE 3DU TO 50 NW SMN. ..GOSS..08/20/24 ATTN...WFO...MSO...TFX... STATUS REPORT FOR WS 640 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC013-015-027-029-035-039-041-045-047-049-051-063-073-077-081- 099-101-200340- MT . MONTANA COUNTIES INCLUDED ARE CASCADE CHOUTEAU FERGUS FLATHEAD GLACIER GRANITE HILL JUDITH BASIN LAKE LEWIS AND CLARK LIBERTY MISSOULA PONDERA POWELL RAVALLI TETON TOOLE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 640 SEVERE TSTM ID MT 192050Z - 200400Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 640 NWS Storm Prediction Center Norman OK 250 PM MDT Mon Aug 19 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northeast Idaho Western and Central Montana * Effective this Monday afternoon and evening from 250 PM until 1000 PM MDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Thunderstorms are forming over the mountains of northern Idaho and western Montana. These storms will intensify and organize through the afternoon and spread northeastward across the watch area. Damaging wind gusts will be possible in the strongest storms. The severe thunderstorm watch area is approximately along and 70 statute miles east and west of a line from 35 miles east southeast of Salmon ID to 35 miles northeast of Cut Bank MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU0). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 639... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 23025. ...Hart Read more

WW 0640 Status Updates
STATUS REPORT ON WW 640 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 NW SMN TO 10 ESE 3DU TO 35 SW GTF TO 35 SE GTF. ..GOSS..08/20/24 ATTN...WFO...MSO...TFX... STATUS REPORT FOR WS 640 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC013-015-027-029-035-039-041-045-047-049-051-063-073-077-081- 099-101-200240- MT . MONTANA COUNTIES INCLUDED ARE CASCADE CHOUTEAU FERGUS FLATHEAD GLACIER GRANITE HILL JUDITH BASIN LAKE LEWIS AND CLARK LIBERTY MISSOULA PONDERA POWELL RAVALLI TETON TOOLE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

MD 1960 CONCERNING SEVERE THUNDERSTORM WATCH 640... FOR WESTERN MONTANA AND ADJACENT PORTIONS OF IDAHO
Mesoscale Discussion 1960 NWS Storm Prediction Center Norman OK 0705 PM CDT Mon Aug 19 2024 Areas affected...western Montana and adjacent portions of Idaho Concerning...Severe Thunderstorm Watch 640... Valid 200005Z - 200200Z The severe weather threat for Severe Thunderstorm Watch 640 continues. SUMMARY...Scattered strong thunderstorms moving northeastward across the western Montana vicinity remain capable of producing locally gusty/damaging outflow winds. DISCUSSION...Latest radar loop shows scattered thunderstorms moving northeastward across the western Montana vicinity, including a few embedded/stronger cells. The storms are very high-based, with surface temperatures in convectively unperturbed areas in the low 90s, and dewpoints in the 30s. With the mixed layer extending to around 600 mb, and modest CAPE (around 500 J/kg) above, potential for substantial evaporatively driven downdraft acceleration is evident. This suggests ongoing risk for locally damaging wind gusts as storms continue shifting across the area. Eventually, diurnal cooling of the boundary layer will begin to hinder the severe risk, but until then, risk persists in/near WW 640. ..Goss.. 08/20/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BYZ...TFX...PIH...MSO...BOI...OTX... LAT...LON 48811460 48931353 48491164 47511027 46230952 45410976 45061178 44631441 44751547 45631623 48811460 Read more

WW 0639 Status Updates
STATUS REPORT ON WW 639 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE DEN TO 35 WNW AKO TO 30 NNE AKO TO 40 ENE SNY. ..HALBERT..08/20/24 ATTN...WFO...GLD...PUB...BOU...CYS... STATUS REPORT FOR WS 639 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-025-039-041-061-063-073-087-089-101-121-125-200240- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE CROWLEY ELBERT EL PASO KIOWA KIT CARSON LINCOLN MORGAN OTERO PUEBLO WASHINGTON YUMA THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

MD 1961 CONCERNING SEVERE THUNDERSTORM WATCH 639... FOR EASTERN COLORADO
Mesoscale Discussion 1961 NWS Storm Prediction Center Norman OK 0707 PM CDT Mon Aug 19 2024 Areas affected...Eastern Colorado Concerning...Severe Thunderstorm Watch 639... Valid 200007Z - 200100Z The severe weather threat for Severe Thunderstorm Watch 639 continues. SUMMARY...Storms capable of damaging winds and hail are ongoing across the WW 639, and are expected to persist into the early evening hours. DISCUSSION...A few ongoing convective clusters will continue to be capable of damaging winds and hail, supported by MLCAPE > 2000 J/kg and 45-50 kts of deep-layer vertical shear. Recent radar over east-central and southeastern Colorado shows outflow surging ahead of the convection, and the greatest threat for any damaging winds will be with any upscale growth that occurs on the leading edge of this outflow. In northern Colorado, a more isolated supercell thunderstorm is ongoing, with southeasterly flow and temperatures in the mid-to-upper 70s F out ahead of it. This should support at least some maintenance of a severe threat into the evening hours. Convective coverage and intensity should diminish as the nocturnal boundary layer stabilizes, with watch expiration set for 03Z. ..Halbert/Squitieri.. 08/20/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...GLD...PUB...BOU...CYS... LAT...LON 40600210 40460208 38280205 38210268 38220301 38220334 38090342 37860336 37710343 37640359 37610403 37710460 37900485 38170503 38620500 38990499 39500498 39950492 40350492 40700465 40970425 41130393 41180311 41010244 40600210 Read more

WW 0640 Status Updates
STATUS REPORT ON WW 640 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 WNW SMN TO 30 S 3DU TO 25 W HLN TO 15 NE HLN TO 45 ENE HLN. ..GOSS..08/20/24 ATTN...WFO...MSO...TFX... STATUS REPORT FOR WS 640 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC013-015-027-029-035-039-041-045-047-049-051-063-073-077-081- 099-101-200140- MT . MONTANA COUNTIES INCLUDED ARE CASCADE CHOUTEAU FERGUS FLATHEAD GLACIER GRANITE HILL JUDITH BASIN LAKE LEWIS AND CLARK LIBERTY MISSOULA PONDERA POWELL RAVALLI TETON TOOLE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Mon Aug 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE CENTRAL/NORTHERN HIGH PLAINS INTO WESTERN MONTANA... ...SUMMARY... Scattered severe thunderstorms are possible across portions of the northern and central High Plains, and over western Montana. Large hail and severe gusts are the primary hazards. ...01z Update... Notable mid-level short-wave trough is topping the northern High Plains ridge over eastern MT early this evening. A secondary, less amplified disturbance is ejecting across the Bitter Roots of ID into extreme western MT. Each of these features appears partly responsible for scattered robust convection immediately downstream. Latest diagnostic data suggests an axis of 1000-2000 J/kg MLCAPE extends across the central High Plains from eastern CO-NE Panhandle-eastern MT. This axis of buoyancy will be the primary corridor for strong/severe thunderstorms this evening. Both GGW and UNR exhibited modest instability, with ample 0-6km shear, for slow-moving supercells; though, both had CINH and capping at the top of the boundary layer around 1km AGL. Primary concentration of longer-lived clusters will likely shift into the western Dakotas as this is where the LLJ should strengthen after sunset. Hail/wind remain the primary risks. ..Darrow.. 08/20/2024 Read more

WW 0639 Status Updates
STATUS REPORT ON WW 639 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SSW CYS TO 35 ENE SNY. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1961 ..HALBERT..08/20/24 ATTN...WFO...GLD...PUB...BOU...CYS... STATUS REPORT FOR WS 639 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-025-039-041-061-063-073-075-087-089-101-121-123-125- 200140- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE CROWLEY ELBERT EL PASO KIOWA KIT CARSON LINCOLN LOGAN MORGAN OTERO PUEBLO WASHINGTON WELD YUMA NEC033-200140- NE . NEBRASKA COUNTIES INCLUDED ARE CHEYENNE THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more