Severe Storms

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNE AKO TO 30 S VTN. ..BROYLES..08/12/24 ATTN...WFO...GLD...BOU...LBF... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-063-095-115-120240- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE KIT CARSON PHILLIPS SEDGWICK KSC109-181-193-199-120240- KS . KANSAS COUNTIES INCLUDED ARE LOGAN SHERMAN THOMAS WALLACE NEC029-091-101-117-135-120240- NE . NEBRASKA COUNTIES INCLUDED ARE CHASE HOOKER KEITH MCPHERSON PERKINS Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNE AKO TO 30 S VTN. ..BROYLES..08/12/24 ATTN...WFO...GLD...BOU...LBF... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-063-095-115-120240- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE KIT CARSON PHILLIPS SEDGWICK KSC109-181-193-199-120240- KS . KANSAS COUNTIES INCLUDED ARE LOGAN SHERMAN THOMAS WALLACE NEC029-091-101-117-135-120240- NE . NEBRASKA COUNTIES INCLUDED ARE CHASE HOOKER KEITH MCPHERSON PERKINS Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NNE AKO TO 30 S VTN. ..BROYLES..08/12/24 ATTN...WFO...GLD...BOU...LBF... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-063-095-115-120240- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE KIT CARSON PHILLIPS SEDGWICK KSC109-181-193-199-120240- KS . KANSAS COUNTIES INCLUDED ARE LOGAN SHERMAN THOMAS WALLACE NEC029-091-101-117-135-120240- NE . NEBRASKA COUNTIES INCLUDED ARE CHASE HOOKER KEITH MCPHERSON PERKINS Read more

WW 619 SEVERE TSTM CO KS NE 112040Z - 120300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 619 NWS Storm Prediction Center Norman OK 240 PM MDT Sun Aug 11 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northeast Colorado Northwest Kansas Western Nebraska * Effective this Sunday afternoon and evening from 240 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 A tornado or two possible SUMMARY...Thunderstorms are strengthening across the Nebraska panhandle and northeast Colorado. This activity will spread eastward through the afternoon, posing a risk of large hail and damaging wind gusts. The severe thunderstorm watch area is approximately along and 50 statute miles east and west of a line from 75 miles north northwest of Mullen NE to 40 miles south of Burlington CO. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 618... 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 29025. ...Hart Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0749 PM CDT Sun Aug 11 2024 Valid 120100Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue across parts of the central High Plains early this evening. Other storms with strong wind gusts may affect parts of Utah, northern Arizona, and western Colorado for the next few hours. ...01z Update... Early-evening water-vapor imagery depicts a well-defined short-wave trough digging southeast across the High Plains of SD/NE. This feature is forecast to approach the mid MO Valley by sunrise. Scattered convection developed in response to the short wave across SD/NE with more isolated activity noted into eastern CO. Over the last hour or so, the primary corridor of robust updrafts is focusing along an instability axis that extends from western NE into western KS. These storms will continue to propagate south along this zone of stronger buoyancy, especially as northwesterly flow dominates the High Plains in the wake of the short wave. Boundary-layer airmass over much of the lower central Plains is not particularly unstable so convection is expected to weaken as it advances atop this cooler, more stable air. For the next few hours hail/wind could accompany the storms from north of LBF to south of GLD. Gusty winds may also be noted with convection across the Great Basin into western CO for the next few hours. Numerous showers/thunderstorms have developed across southern UT/northern AZ into western CO. 00z sounding from GJT exhibits around 400 J/kg MLCAPE with steep 0-3km lapse rates. After sunset low-levels should cool and the prospects for severe gusts should diminish. ..Darrow.. 08/12/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0749 PM CDT Sun Aug 11 2024 Valid 120100Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue across parts of the central High Plains early this evening. Other storms with strong wind gusts may affect parts of Utah, northern Arizona, and western Colorado for the next few hours. ...01z Update... Early-evening water-vapor imagery depicts a well-defined short-wave trough digging southeast across the High Plains of SD/NE. This feature is forecast to approach the mid MO Valley by sunrise. Scattered convection developed in response to the short wave across SD/NE with more isolated activity noted into eastern CO. Over the last hour or so, the primary corridor of robust updrafts is focusing along an instability axis that extends from western NE into western KS. These storms will continue to propagate south along this zone of stronger buoyancy, especially as northwesterly flow dominates the High Plains in the wake of the short wave. Boundary-layer airmass over much of the lower central Plains is not particularly unstable so convection is expected to weaken as it advances atop this cooler, more stable air. For the next few hours hail/wind could accompany the storms from north of LBF to south of GLD. Gusty winds may also be noted with convection across the Great Basin into western CO for the next few hours. Numerous showers/thunderstorms have developed across southern UT/northern AZ into western CO. 00z sounding from GJT exhibits around 400 J/kg MLCAPE with steep 0-3km lapse rates. After sunset low-levels should cool and the prospects for severe gusts should diminish. ..Darrow.. 08/12/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0749 PM CDT Sun Aug 11 2024 Valid 120100Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue across parts of the central High Plains early this evening. Other storms with strong wind gusts may affect parts of Utah, northern Arizona, and western Colorado for the next few hours. ...01z Update... Early-evening water-vapor imagery depicts a well-defined short-wave trough digging southeast across the High Plains of SD/NE. This feature is forecast to approach the mid MO Valley by sunrise. Scattered convection developed in response to the short wave across SD/NE with more isolated activity noted into eastern CO. Over the last hour or so, the primary corridor of robust updrafts is focusing along an instability axis that extends from western NE into western KS. These storms will continue to propagate south along this zone of stronger buoyancy, especially as northwesterly flow dominates the High Plains in the wake of the short wave. Boundary-layer airmass over much of the lower central Plains is not particularly unstable so convection is expected to weaken as it advances atop this cooler, more stable air. For the next few hours hail/wind could accompany the storms from north of LBF to south of GLD. Gusty winds may also be noted with convection across the Great Basin into western CO for the next few hours. Numerous showers/thunderstorms have developed across southern UT/northern AZ into western CO. 00z sounding from GJT exhibits around 400 J/kg MLCAPE with steep 0-3km lapse rates. After sunset low-levels should cool and the prospects for severe gusts should diminish. ..Darrow.. 08/12/2024 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0749 PM CDT Sun Aug 11 2024 Valid 120100Z - 121200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue across parts of the central High Plains early this evening. Other storms with strong wind gusts may affect parts of Utah, northern Arizona, and western Colorado for the next few hours. ...01z Update... Early-evening water-vapor imagery depicts a well-defined short-wave trough digging southeast across the High Plains of SD/NE. This feature is forecast to approach the mid MO Valley by sunrise. Scattered convection developed in response to the short wave across SD/NE with more isolated activity noted into eastern CO. Over the last hour or so, the primary corridor of robust updrafts is focusing along an instability axis that extends from western NE into western KS. These storms will continue to propagate south along this zone of stronger buoyancy, especially as northwesterly flow dominates the High Plains in the wake of the short wave. Boundary-layer airmass over much of the lower central Plains is not particularly unstable so convection is expected to weaken as it advances atop this cooler, more stable air. For the next few hours hail/wind could accompany the storms from north of LBF to south of GLD. Gusty winds may also be noted with convection across the Great Basin into western CO for the next few hours. Numerous showers/thunderstorms have developed across southern UT/northern AZ into western CO. 00z sounding from GJT exhibits around 400 J/kg MLCAPE with steep 0-3km lapse rates. After sunset low-levels should cool and the prospects for severe gusts should diminish. ..Darrow.. 08/12/2024 Read more

WW 0618 Status Updates
STATUS REPORT ON WW 618 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR TO 40 NW PHP. ..BROYLES..08/11/24 ATTN...WFO...UNR... STATUS REPORT FOR WS 618 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-093-095-102-103-121-112340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD 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 0618 Status Updates
STATUS REPORT ON WW 618 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR TO 40 NW PHP. ..BROYLES..08/11/24 ATTN...WFO...UNR... STATUS REPORT FOR WS 618 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-093-095-102-103-121-112340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD 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 0618 Status Updates
STATUS REPORT ON WW 618 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR TO 40 NW PHP. ..BROYLES..08/11/24 ATTN...WFO...UNR... STATUS REPORT FOR WS 618 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-093-095-102-103-121-112340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD 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 1883 CONCERNING SEVERE THUNDERSTORM WATCH 618...619... FOR FAR SOUTHWEST SOUTH DAKOTA...WESTERN NEBRASKA...NORTHEAST COLORADO...FAR NORTHWEST KANSAS
Mesoscale Discussion 1883 NWS Storm Prediction Center Norman OK 0518 PM CDT Sun Aug 11 2024 Areas affected...Far Southwest South Dakota...Western Nebraska...Northeast Colorado...Far Northwest Kansas Concerning...Severe Thunderstorm Watch 618...619... Valid 112218Z - 120015Z The severe weather threat for Severe Thunderstorm Watch 618, 619 continues. SUMMARY...A threat for large hail and severe wind gusts will continue across the central Plains over the next few hours. There is a localized potential for hail over 2 inches in diameter. DISCUSSION...Water vapor imagery shows northwest flow over much of the central U.S., with a subtle shortwave trough moving through the central High Plains. At the surface, a quasi-stationary front is located from southwestern South Dakota extending southward into far eastern Colorado. Scattered to widely scattered thunderstorms are ongoing just to the east of the boundary. The RAP suggests that the storms are near an axis of instability, with MLCAPE just to the east of the front estimated to be in the 1000 to 2000 J/kg range. In addition, regional WSR-88D VWPs also show moderate deep-layer shear in place across much of the central High Plains. 0-6 km shear appears to be in the 40 to 50 knot range along and near the instability axis. This will continue to support supercell development over the next few hours. Severe wind gusts and isolated large hail will be the primary threats. Hailstones of greater than 2 inches in diameter will be possible locally, mainly over far northeast Colorado and far northwest Kansas, where the combination of instability and shear appears to be maximized. ..Broyles.. 08/11/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR...GLD...BOU... LAT...LON 41640244 40420263 39900254 39570221 39510183 39620134 40040105 41390060 42350032 42910030 43230057 43410129 43350191 43170218 42840231 41640244 Read more

MD 1883 CONCERNING SEVERE THUNDERSTORM WATCH 618...619... FOR FAR SOUTHWEST SOUTH DAKOTA...WESTERN NEBRASKA...NORTHEAST COLORADO...FAR NORTHWEST KANSAS
Mesoscale Discussion 1883 NWS Storm Prediction Center Norman OK 0518 PM CDT Sun Aug 11 2024 Areas affected...Far Southwest South Dakota...Western Nebraska...Northeast Colorado...Far Northwest Kansas Concerning...Severe Thunderstorm Watch 618...619... Valid 112218Z - 120015Z The severe weather threat for Severe Thunderstorm Watch 618, 619 continues. SUMMARY...A threat for large hail and severe wind gusts will continue across the central Plains over the next few hours. There is a localized potential for hail over 2 inches in diameter. DISCUSSION...Water vapor imagery shows northwest flow over much of the central U.S., with a subtle shortwave trough moving through the central High Plains. At the surface, a quasi-stationary front is located from southwestern South Dakota extending southward into far eastern Colorado. Scattered to widely scattered thunderstorms are ongoing just to the east of the boundary. The RAP suggests that the storms are near an axis of instability, with MLCAPE just to the east of the front estimated to be in the 1000 to 2000 J/kg range. In addition, regional WSR-88D VWPs also show moderate deep-layer shear in place across much of the central High Plains. 0-6 km shear appears to be in the 40 to 50 knot range along and near the instability axis. This will continue to support supercell development over the next few hours. Severe wind gusts and isolated large hail will be the primary threats. Hailstones of greater than 2 inches in diameter will be possible locally, mainly over far northeast Colorado and far northwest Kansas, where the combination of instability and shear appears to be maximized. ..Broyles.. 08/11/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR...GLD...BOU... LAT...LON 41640244 40420263 39900254 39570221 39510183 39620134 40040105 41390060 42350032 42910030 43230057 43410129 43350191 43170218 42840231 41640244 Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNW LAA TO 25 E AIA TO 60 S PHP. ..BROYLES..08/11/24 ATTN...WFO...GLD...BOU...LBF... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-063-095-115-125-120040- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE KIT CARSON PHILLIPS SEDGWICK YUMA KSC023-109-153-181-193-199-120040- KS . KANSAS COUNTIES INCLUDED ARE CHEYENNE LOGAN RAWLINS SHERMAN THOMAS WALLACE NEC005-029-031-049-057-069-075-087-091-101-117-135-120040- NE . NEBRASKA COUNTIES INCLUDED ARE ARTHUR CHASE CHERRY DEUEL DUNDY GARDEN Read more

WW 619 SEVERE TSTM CO KS NE 112040Z - 120300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 619 NWS Storm Prediction Center Norman OK 240 PM MDT Sun Aug 11 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northeast Colorado Northwest Kansas Western Nebraska * Effective this Sunday afternoon and evening from 240 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 A tornado or two possible SUMMARY...Thunderstorms are strengthening across the Nebraska panhandle and northeast Colorado. This activity will spread eastward through the afternoon, posing a risk of large hail and damaging wind gusts. The severe thunderstorm watch area is approximately along and 50 statute miles east and west of a line from 75 miles north northwest of Mullen NE to 40 miles south of Burlington CO. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 618... 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 29025. ...Hart Read more

MD 1881 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PARTS OF UT INTO WESTERN CO
Mesoscale Discussion 1881 NWS Storm Prediction Center Norman OK 0346 PM CDT Sun Aug 11 2024 Areas affected...Parts of UT into western CO Concerning...Severe potential...Watch unlikely Valid 112046Z - 112245Z Probability of Watch Issuance...5 percent SUMMARY...Isolated severe gusts and perhaps some hail are possible this afternoon. DISCUSSION...Convection is gradually increasing across parts of UT into western CO this afternoon. Strong heating of a relatively moist environment has resulted in modest destabilization, with MLCAPE increasing above 500 J/kg in some areas. This region is on the southern periphery of modest midlevel west-northwesterlies associated with a shortwave trough moving across the northern Rockies/High Plains. Effective shear of 20-30 kt could support at least transient storm organization through the afternoon. While some hail cannot be ruled out, isolated severe gusts will likely become the primary threat with time, as outflows grow and intensify within the well-mixed environment. ..Dean/Hart.. 08/11/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...GJT...SLC... LAT...LON 39221384 39911330 40020948 39990747 38890739 37600802 37460952 37311366 37821377 39221384 Read more

WW 0618 Status Updates
STATUS REPORT ON WW 618 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR TO 40 NW PHP. ..BROYLES..08/11/24 ATTN...WFO...UNR... STATUS REPORT FOR WS 618 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-093-095-102-103-121-112340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD 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 0618 Status Updates
STATUS REPORT ON WW 618 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE CDR TO 40 NW PHP. ..BROYLES..08/11/24 ATTN...WFO...UNR... STATUS REPORT FOR WS 618 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-093-095-102-103-121-112340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD 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 618 SEVERE TSTM SD WY 111830Z - 120100Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 618 NWS Storm Prediction Center Norman OK 1230 PM MDT Sun Aug 11 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwest South Dakota Northeast Wyoming * Effective this Sunday afternoon and evening from 1230 PM until 700 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 A tornado or two possible SUMMARY...Thunderstorms will increase in coverage and intensity through the afternoon across the watch area. A few severe storms are expected, capable of large hail and damaging wind gusts. The severe thunderstorm watch area is approximately along and 40 statute miles north and south of a line from 50 miles west of Rapid City SD to 65 miles southeast of Philip SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). 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 28030. ...Hart Read more

MD 1882 CONCERNING SEVERE THUNDERSTORM WATCH 618... FOR PORTIONS OF SOUTHWESTERN SD INTO FAR NORTHWESTERN NE
Mesoscale Discussion 1882 NWS Storm Prediction Center Norman OK 0353 PM CDT Sun Aug 11 2024 Areas affected...Portions of southwestern SD into far northwestern NE Concerning...Severe Thunderstorm Watch 618... Valid 112053Z - 112230Z The severe weather threat for Severe Thunderstorm Watch 618 continues. SUMMARY...Severe wind and large hail threat continues across Severe Thunderstorm Watch 618 -- especially with an organized southeastward-moving cluster. DISCUSSION...The latest radar data from KUDX depicts an organized cluster of thunderstorms (with an intense embedded supercell) tracking southeastward at around 30 kt. This activity will continue to be aided by 40 kt of 0-6 km shear (per UDX VWP data) oriented perpendicular to the associated gust front. Additionally, pre-convective low-level lapse rates continue to diurnally steepen amid middle/upper 50s dewpoints -- which should also support maintained storm intensity with southeastward extent. The primary concern is severe wind gusts (generally up to 70 mph) and large hail to around 2 inches in diameter. While less certain, a brief tornado cannot be ruled out given the embedded supercell mode and moist/backed east-southeasterly low-level flow to the east/southeast of these storms. ..Weinman.. 08/11/2024 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR... LAT...LON 43710293 44020276 44110257 44080226 43800176 43330160 42920199 42870257 43120296 43440321 43710293 Read more