Severe Storms

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0112 AM CDT Mon Aug 26 2019 Valid 261200Z - 271200Z ...NO CRITICAL AREAS... ...Synopsis... A broad upper-level trough will continue to move east through the central Rockies today, with remnant enhanced mid-level flow along the back edge of this feature. An upper-level ridge will again build across the Pacific Northwest coast. At the surface, an anticyclone will build within the northern Rockies as a thermally induced pressure trough sets up across northern California into parts of the Oregon coast. While fire weather concerns will be greatly reduced from Sunday, a few areas of locally elevated conditions are probable. ...Southwestern Wyoming and Central Utah... With some stronger northwesterly flow aloft, areas of southwestern Wyoming and within the lee of the Wasatch range may experience 15-20 mph winds, with potentially higher gusts, during the afternoon. These conditions, however, are not expected to be widespread or long-lasting as surface pressure gradient remains weak under the influence of the anticyclone. ...Willamette Valley Vicinity... The surface pressure pattern will favor offshore flow across much of the Oregon coast, particularly during the evening and overnight hours. Guidance differs on how low the RH will fall (most likely 25-35%), but there is ample agreement that sustained 15 mph winds will be localized in nature. Dry offshore flow may also occur in southwestern Oregon, but confidence in even locally elevated conditions is less farther south. ..Wendt.. 08/26/2019 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1246 AM CDT Mon Aug 26 2019 Valid 271200Z - 281200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM NORTHWEST TEXAS/SOUTHWEST OKLAHOMA SOUTHEASTWARD INTO WESTERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms are possible from northwest Texas/southwest Oklahoma southeastward into western Louisiana on Tuesday. ...Synopsis... Maturing mid-latitude cyclone, centered near the southern Manitoba/Ontario border early Tuesday morning, is expected continue eastward into far northwest Ontario. Expansive cyclonic flow throughout the base of this system (and attendant enhanced westerly flow aloft) will also progress eastward over the upper/middle MS Valleys into the OH Valley. Surface low attendant to this upper system is expected to be centered over northwestern Ontario Tuesday morning. A cold front will extend southeastward from this low into the Upper Great Lakes then southwestward through the middle MS Valley into southwest TX. Northern/eastern portion of this front will remain progressive, continuing eastward through the OH Valley and Lower Great Lakes. Southern/western portion of this front will be less progressive with outflow from an MCS likely becoming the effective boundary across southern OK/northern TX. ...Far Northwest TX/Southeast OK into Western LA... Showers and thunderstorm will likely be ongoing at the beginning of the period as a decaying MCS moves into the region. Isolated damaging wind gusts are possible with the strongest cells along the outflow boundary. Warm and moist conditions are anticipated south of the composite outflow boundary Tuesday afternoon. Mid-level temperatures will be relatively warm, but the warm and moist low-levels will likely result in an erosion of any convective inhibition. Convergence along the boundary will then lead to thunderstorm development. However, given the mesoscale nature of this boundary, its location is hard to ascertain with much confidence at this point. Most of the convection-allowing guidance suggests a more southerly boundary location during the afternoon and the 5% threat area was adjusted accordingly. The lack of stronger vertical shear suggests minimal storm organization and a predominantly multicellular mode. Even so, strong water-loaded downbursts are possible with the strongest updrafts. ...Upper Midwest... A shortwave trough embedded within the base of the larger parent mid-latitude cyclone is expected to move into the region during the afternoon. Cool mid-level temperatures and large-scale forcing for ascent associated with this trough will led to thunderstorm development. Given the weak instability, storms are generally expected to remain sub-severe with some small hail possible within the strongest updrafts. ...MAXIMUM RISK BY HAZARD... Tornado: 2% - Marginal Wind: 5% - Marginal Hail: 5% - Marginal ..Mosier.. 08/26/2019 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1246 AM CDT Mon Aug 26 2019 Valid 271200Z - 281200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM NORTHWEST TEXAS/SOUTHWEST OKLAHOMA SOUTHEASTWARD INTO WESTERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms are possible from northwest Texas/southwest Oklahoma southeastward into western Louisiana on Tuesday. ...Synopsis... Maturing mid-latitude cyclone, centered near the southern Manitoba/Ontario border early Tuesday morning, is expected continue eastward into far northwest Ontario. Expansive cyclonic flow throughout the base of this system (and attendant enhanced westerly flow aloft) will also progress eastward over the upper/middle MS Valleys into the OH Valley. Surface low attendant to this upper system is expected to be centered over northwestern Ontario Tuesday morning. A cold front will extend southeastward from this low into the Upper Great Lakes then southwestward through the middle MS Valley into southwest TX. Northern/eastern portion of this front will remain progressive, continuing eastward through the OH Valley and Lower Great Lakes. Southern/western portion of this front will be less progressive with outflow from an MCS likely becoming the effective boundary across southern OK/northern TX. ...Far Northwest TX/Southeast OK into Western LA... Showers and thunderstorm will likely be ongoing at the beginning of the period as a decaying MCS moves into the region. Isolated damaging wind gusts are possible with the strongest cells along the outflow boundary. Warm and moist conditions are anticipated south of the composite outflow boundary Tuesday afternoon. Mid-level temperatures will be relatively warm, but the warm and moist low-levels will likely result in an erosion of any convective inhibition. Convergence along the boundary will then lead to thunderstorm development. However, given the mesoscale nature of this boundary, its location is hard to ascertain with much confidence at this point. Most of the convection-allowing guidance suggests a more southerly boundary location during the afternoon and the 5% threat area was adjusted accordingly. The lack of stronger vertical shear suggests minimal storm organization and a predominantly multicellular mode. Even so, strong water-loaded downbursts are possible with the strongest updrafts. ...Upper Midwest... A shortwave trough embedded within the base of the larger parent mid-latitude cyclone is expected to move into the region during the afternoon. Cool mid-level temperatures and large-scale forcing for ascent associated with this trough will led to thunderstorm development. Given the weak instability, storms are generally expected to remain sub-severe with some small hail possible within the strongest updrafts. ...MAXIMUM RISK BY HAZARD... Tornado: 2% - Marginal Wind: 5% - Marginal Hail: 5% - Marginal ..Mosier.. 08/26/2019 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1246 AM CDT Mon Aug 26 2019 Valid 271200Z - 281200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM NORTHWEST TEXAS/SOUTHWEST OKLAHOMA SOUTHEASTWARD INTO WESTERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms are possible from northwest Texas/southwest Oklahoma southeastward into western Louisiana on Tuesday. ...Synopsis... Maturing mid-latitude cyclone, centered near the southern Manitoba/Ontario border early Tuesday morning, is expected continue eastward into far northwest Ontario. Expansive cyclonic flow throughout the base of this system (and attendant enhanced westerly flow aloft) will also progress eastward over the upper/middle MS Valleys into the OH Valley. Surface low attendant to this upper system is expected to be centered over northwestern Ontario Tuesday morning. A cold front will extend southeastward from this low into the Upper Great Lakes then southwestward through the middle MS Valley into southwest TX. Northern/eastern portion of this front will remain progressive, continuing eastward through the OH Valley and Lower Great Lakes. Southern/western portion of this front will be less progressive with outflow from an MCS likely becoming the effective boundary across southern OK/northern TX. ...Far Northwest TX/Southeast OK into Western LA... Showers and thunderstorm will likely be ongoing at the beginning of the period as a decaying MCS moves into the region. Isolated damaging wind gusts are possible with the strongest cells along the outflow boundary. Warm and moist conditions are anticipated south of the composite outflow boundary Tuesday afternoon. Mid-level temperatures will be relatively warm, but the warm and moist low-levels will likely result in an erosion of any convective inhibition. Convergence along the boundary will then lead to thunderstorm development. However, given the mesoscale nature of this boundary, its location is hard to ascertain with much confidence at this point. Most of the convection-allowing guidance suggests a more southerly boundary location during the afternoon and the 5% threat area was adjusted accordingly. The lack of stronger vertical shear suggests minimal storm organization and a predominantly multicellular mode. Even so, strong water-loaded downbursts are possible with the strongest updrafts. ...Upper Midwest... A shortwave trough embedded within the base of the larger parent mid-latitude cyclone is expected to move into the region during the afternoon. Cool mid-level temperatures and large-scale forcing for ascent associated with this trough will led to thunderstorm development. Given the weak instability, storms are generally expected to remain sub-severe with some small hail possible within the strongest updrafts. ...MAXIMUM RISK BY HAZARD... Tornado: 2% - Marginal Wind: 5% - Marginal Hail: 5% - Marginal ..Mosier.. 08/26/2019 Read more

SPC 0600Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1246 AM CDT Mon Aug 26 2019 Valid 271200Z - 281200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM NORTHWEST TEXAS/SOUTHWEST OKLAHOMA SOUTHEASTWARD INTO WESTERN LOUISIANA... ...SUMMARY... Isolated severe thunderstorms are possible from northwest Texas/southwest Oklahoma southeastward into western Louisiana on Tuesday. ...Synopsis... Maturing mid-latitude cyclone, centered near the southern Manitoba/Ontario border early Tuesday morning, is expected continue eastward into far northwest Ontario. Expansive cyclonic flow throughout the base of this system (and attendant enhanced westerly flow aloft) will also progress eastward over the upper/middle MS Valleys into the OH Valley. Surface low attendant to this upper system is expected to be centered over northwestern Ontario Tuesday morning. A cold front will extend southeastward from this low into the Upper Great Lakes then southwestward through the middle MS Valley into southwest TX. Northern/eastern portion of this front will remain progressive, continuing eastward through the OH Valley and Lower Great Lakes. Southern/western portion of this front will be less progressive with outflow from an MCS likely becoming the effective boundary across southern OK/northern TX. ...Far Northwest TX/Southeast OK into Western LA... Showers and thunderstorm will likely be ongoing at the beginning of the period as a decaying MCS moves into the region. Isolated damaging wind gusts are possible with the strongest cells along the outflow boundary. Warm and moist conditions are anticipated south of the composite outflow boundary Tuesday afternoon. Mid-level temperatures will be relatively warm, but the warm and moist low-levels will likely result in an erosion of any convective inhibition. Convergence along the boundary will then lead to thunderstorm development. However, given the mesoscale nature of this boundary, its location is hard to ascertain with much confidence at this point. Most of the convection-allowing guidance suggests a more southerly boundary location during the afternoon and the 5% threat area was adjusted accordingly. The lack of stronger vertical shear suggests minimal storm organization and a predominantly multicellular mode. Even so, strong water-loaded downbursts are possible with the strongest updrafts. ...Upper Midwest... A shortwave trough embedded within the base of the larger parent mid-latitude cyclone is expected to move into the region during the afternoon. Cool mid-level temperatures and large-scale forcing for ascent associated with this trough will led to thunderstorm development. Given the weak instability, storms are generally expected to remain sub-severe with some small hail possible within the strongest updrafts. ...MAXIMUM RISK BY HAZARD... Tornado: 2% - Marginal Wind: 5% - Marginal Hail: 5% - Marginal ..Mosier.. 08/26/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1240 AM CDT Mon Aug 26 2019 Valid 261200Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL MISSOURI SOUTHWESTWARD INTO NORTHEAST OKLAHOMA... ...SUMMARY... Severe thunderstorms are expected this afternoon through the evening from the Middle Mississippi Valley region into eastern Kansas and Oklahoma. Large hail, severe gusts, and a few tornadoes are possible before the threat transitions to mainly a risk for severe gusts and wind damage tonight. ...Lower MO Valley into OK... A mid-level trough over the Upper Midwest today will evolve into a closed low near the MN/Canada border by early Tuesday. A belt of strong westerly 500mb flow will overspread the lower MO Valley during the day. A complicating factor for this forecast will involve an MCS over the north-central Plains which is forecast to move into the lower MO Valley during the morning hours. Model guidance generally depicts this scenario with some severe risk perhaps ongoing early this morning before possibly waning with the MCS dissipating over the lower MO Valley. Renewed storm development is likely by late afternoon along a cold front forecast to move southeast across the central Great Plains and lower MO Valley. The intersection of possible earlier-day outflow with the front may serve as a preferred storm initiation zone before additional storms develop along the southwest-northeast oriented boundary. The pre-convective airmass is forecast to become very unstable from central OK northeast into eastern KS and MO with MLCAPE ranging from 3000-4000 J/kg. An initial window of opportunity (2 hours) may exist for a supercell risk capable of all hazards. Precipitable water around 2 inches and large CAPE, a wind profile strengthening from the low into the midlevels (40-50kt) and weakening in the high levels, and strong agreement of convection-allowing model guidance all suggest a relatively quick transition to a linear band of storms from northern MO zippering southwest into central OK during the evening. Wind damage from severe gusts will likely become most prevalent during the cellular to squall line transition (possible HP supercells) and the initial 1-3 hours afterwards during the evening. A gradual diminishing in storm intensity and potential severe coverage is expected by late evening into the overnight as storms move to the MS river and the Ark-La-Tex. ..Smith/Wendt.. 08/26/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1240 AM CDT Mon Aug 26 2019 Valid 261200Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL MISSOURI SOUTHWESTWARD INTO NORTHEAST OKLAHOMA... ...SUMMARY... Severe thunderstorms are expected this afternoon through the evening from the Middle Mississippi Valley region into eastern Kansas and Oklahoma. Large hail, severe gusts, and a few tornadoes are possible before the threat transitions to mainly a risk for severe gusts and wind damage tonight. ...Lower MO Valley into OK... A mid-level trough over the Upper Midwest today will evolve into a closed low near the MN/Canada border by early Tuesday. A belt of strong westerly 500mb flow will overspread the lower MO Valley during the day. A complicating factor for this forecast will involve an MCS over the north-central Plains which is forecast to move into the lower MO Valley during the morning hours. Model guidance generally depicts this scenario with some severe risk perhaps ongoing early this morning before possibly waning with the MCS dissipating over the lower MO Valley. Renewed storm development is likely by late afternoon along a cold front forecast to move southeast across the central Great Plains and lower MO Valley. The intersection of possible earlier-day outflow with the front may serve as a preferred storm initiation zone before additional storms develop along the southwest-northeast oriented boundary. The pre-convective airmass is forecast to become very unstable from central OK northeast into eastern KS and MO with MLCAPE ranging from 3000-4000 J/kg. An initial window of opportunity (2 hours) may exist for a supercell risk capable of all hazards. Precipitable water around 2 inches and large CAPE, a wind profile strengthening from the low into the midlevels (40-50kt) and weakening in the high levels, and strong agreement of convection-allowing model guidance all suggest a relatively quick transition to a linear band of storms from northern MO zippering southwest into central OK during the evening. Wind damage from severe gusts will likely become most prevalent during the cellular to squall line transition (possible HP supercells) and the initial 1-3 hours afterwards during the evening. A gradual diminishing in storm intensity and potential severe coverage is expected by late evening into the overnight as storms move to the MS river and the Ark-La-Tex. ..Smith/Wendt.. 08/26/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1240 AM CDT Mon Aug 26 2019 Valid 261200Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL MISSOURI SOUTHWESTWARD INTO NORTHEAST OKLAHOMA... ...SUMMARY... Severe thunderstorms are expected this afternoon through the evening from the Middle Mississippi Valley region into eastern Kansas and Oklahoma. Large hail, severe gusts, and a few tornadoes are possible before the threat transitions to mainly a risk for severe gusts and wind damage tonight. ...Lower MO Valley into OK... A mid-level trough over the Upper Midwest today will evolve into a closed low near the MN/Canada border by early Tuesday. A belt of strong westerly 500mb flow will overspread the lower MO Valley during the day. A complicating factor for this forecast will involve an MCS over the north-central Plains which is forecast to move into the lower MO Valley during the morning hours. Model guidance generally depicts this scenario with some severe risk perhaps ongoing early this morning before possibly waning with the MCS dissipating over the lower MO Valley. Renewed storm development is likely by late afternoon along a cold front forecast to move southeast across the central Great Plains and lower MO Valley. The intersection of possible earlier-day outflow with the front may serve as a preferred storm initiation zone before additional storms develop along the southwest-northeast oriented boundary. The pre-convective airmass is forecast to become very unstable from central OK northeast into eastern KS and MO with MLCAPE ranging from 3000-4000 J/kg. An initial window of opportunity (2 hours) may exist for a supercell risk capable of all hazards. Precipitable water around 2 inches and large CAPE, a wind profile strengthening from the low into the midlevels (40-50kt) and weakening in the high levels, and strong agreement of convection-allowing model guidance all suggest a relatively quick transition to a linear band of storms from northern MO zippering southwest into central OK during the evening. Wind damage from severe gusts will likely become most prevalent during the cellular to squall line transition (possible HP supercells) and the initial 1-3 hours afterwards during the evening. A gradual diminishing in storm intensity and potential severe coverage is expected by late evening into the overnight as storms move to the MS river and the Ark-La-Tex. ..Smith/Wendt.. 08/26/2019 Read more

SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1240 AM CDT Mon Aug 26 2019 Valid 261200Z - 271200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL MISSOURI SOUTHWESTWARD INTO NORTHEAST OKLAHOMA... ...SUMMARY... Severe thunderstorms are expected this afternoon through the evening from the Middle Mississippi Valley region into eastern Kansas and Oklahoma. Large hail, severe gusts, and a few tornadoes are possible before the threat transitions to mainly a risk for severe gusts and wind damage tonight. ...Lower MO Valley into OK... A mid-level trough over the Upper Midwest today will evolve into a closed low near the MN/Canada border by early Tuesday. A belt of strong westerly 500mb flow will overspread the lower MO Valley during the day. A complicating factor for this forecast will involve an MCS over the north-central Plains which is forecast to move into the lower MO Valley during the morning hours. Model guidance generally depicts this scenario with some severe risk perhaps ongoing early this morning before possibly waning with the MCS dissipating over the lower MO Valley. Renewed storm development is likely by late afternoon along a cold front forecast to move southeast across the central Great Plains and lower MO Valley. The intersection of possible earlier-day outflow with the front may serve as a preferred storm initiation zone before additional storms develop along the southwest-northeast oriented boundary. The pre-convective airmass is forecast to become very unstable from central OK northeast into eastern KS and MO with MLCAPE ranging from 3000-4000 J/kg. An initial window of opportunity (2 hours) may exist for a supercell risk capable of all hazards. Precipitable water around 2 inches and large CAPE, a wind profile strengthening from the low into the midlevels (40-50kt) and weakening in the high levels, and strong agreement of convection-allowing model guidance all suggest a relatively quick transition to a linear band of storms from northern MO zippering southwest into central OK during the evening. Wind damage from severe gusts will likely become most prevalent during the cellular to squall line transition (possible HP supercells) and the initial 1-3 hours afterwards during the evening. A gradual diminishing in storm intensity and potential severe coverage is expected by late evening into the overnight as storms move to the MS river and the Ark-La-Tex. ..Smith/Wendt.. 08/26/2019 Read more

WW 0621 Status Updates
STATUS REPORT ON WW 621 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 SE AIA TO 55 WNW VTN. ..GLEASON..08/26/19 ATTN...WFO...LBF... STATUS REPORT FOR WS 621 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NEC005-009-015-017-031-041-071-075-089-091-103-113-115-117-149- 171-183-260640- NE . NEBRASKA COUNTIES INCLUDED ARE ARTHUR BLAINE BOYD BROWN CHERRY CUSTER GARFIELD GRANT HOLT HOOKER KEYA PAHA LOGAN LOUP MCPHERSON ROCK THOMAS WHEELER 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 0620 Status Updates
STATUS REPORT ON WW 620 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 W VTN TO 40 S PHP TO 10 E PHP TO 30 NNW PIR. ..GLEASON..08/26/19 ATTN...WFO...UNR... STATUS REPORT FOR WS 620 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-095-121-123-260640- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MELLETTE TODD TRIPP 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 620 SEVERE TSTM SD WY 260030Z - 260700Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 620 NWS Storm Prediction Center Norman OK 630 PM MDT Sun Aug 25 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and south-central South Dakota Northeast Wyoming * Effective this Sunday night and Monday morning from 630 PM until 100 AM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Isolated significant damaging wind gusts to 75 mph possible SUMMARY...Severe storms will likely continue to increase in coverage/intensity across northeast Wyoming this evening, and then spread into southwest/south-central South Dakota later this evening. Damaging winds and large hail will be possible. The severe thunderstorm watch area is approximately along and 60 statute miles north and south of a line from 100 miles west of Rapid City SD to 40 miles south southeast of Pierre SD. 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 619... AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 31025. ...Guyer Read more

WW 0620 Status Updates
STATUS REPORT ON WW 620 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ENE CDR TO 55 NNW PHP. ..GOSS..08/26/19 ATTN...WFO...UNR... STATUS REPORT FOR WS 620 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-055-071-095-102-121-123-260540- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON JACKSON MELLETTE OGLALA LAKOTA TODD TRIPP 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 0621 Status Updates
STATUS FOR WATCH 0621 HAS NOT BEEN ISSUED YET Read more

MD 1860 CONCERNING SEVERE THUNDERSTORM WATCH 620... FOR PARTS OF SOUTHERN SOUTH DAKOTA...AND ADJACENT NORTHERN NEBRASKA
Mesoscale Discussion 1860 NWS Storm Prediction Center Norman OK 0949 PM CDT Sun Aug 25 2019 Areas affected...parts of southern South Dakota...and adjacent northern Nebraska Concerning...Severe Thunderstorm Watch 620... Valid 260249Z - 260445Z The severe weather threat for Severe Thunderstorm Watch 620 continues. SUMMARY...Some severe risk continues across portions of South Dakota, in and near WW 620. With storms -- and possibly some severe risk -- likely to spread southeastward into northern Nebraska with time, some need for a new WW south of the existing watch could arise. DISCUSSION...Latest radar loop shows a band of storms -- with embedded stronger cells -- crossing eastern North Dakota and central South Dakota, through remaining portions of WW 619. These storms are gradually moving into a less unstable environment with eastward extent, and should gradually diminish. Meanwhile, a fast-moving cluster of cells continues moving across southwest South Dakota, and is likely producing strong wind gusts and possibly hail. As these storms continue moving southeastward and encounter a more unstable airmass over northern parts of the Nebraska Panhandle, some expansion/intensification of this convection is expected. Progression of these storms south of WW 620 into the next hour or so may require new WW issuance across parts of Nebraska. ..Goss.. 08/26/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...CYS... LAT...LON 42600398 43540406 44200390 44050230 44399989 42959765 41809759 41479854 41660120 42100276 42600398 Read more

WW 0620 Status Updates
STATUS REPORT ON WW 620 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..WENDT..08/26/19 ATTN...WFO...UNR... STATUS REPORT FOR WS 620 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC007-019-033-047-055-071-081-093-095-102-103-121-123-260340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT BUTTE CUSTER FALL RIVER HAAKON JACKSON LAWRENCE MEADE MELLETTE OGLALA LAKOTA PENNINGTON TODD TRIPP WYC011-045-260340- WY . WYOMING COUNTIES INCLUDED ARE CROOK WESTON 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 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 NW PHP TO 50 SW MBG TO 5 SE MBG TO 40 NE MBG TO 45 E BIS TO 45 ENE BIS TO 35 NNW JMS TO 35 SSE DVL. ..WENDT..08/26/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC029-043-047-051-093-260240- ND . NORTH DAKOTA COUNTIES INCLUDED ARE EMMONS KIDDER LOGAN MCINTOSH STUTSMAN SDC017-021-041-045-049-059-065-069-075-085-089-107-117-119-129- 260240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUFFALO CAMPBELL DEWEY EDMUNDS FAULK HAND HUGHES HYDE JONES LYMAN MCPHERSON POTTER STANLEY SULLY WALWORTH THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 NW PHP TO 50 SW MBG TO 5 SE MBG TO 40 NE MBG TO 45 E BIS TO 45 ENE BIS TO 35 NNW JMS TO 35 SSE DVL. ..WENDT..08/26/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC029-043-047-051-093-260240- ND . NORTH DAKOTA COUNTIES INCLUDED ARE EMMONS KIDDER LOGAN MCINTOSH STUTSMAN SDC017-021-041-045-049-059-065-069-075-085-089-107-117-119-129- 260240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUFFALO CAMPBELL DEWEY EDMUNDS FAULK HAND HUGHES HYDE JONES LYMAN MCPHERSON POTTER STANLEY SULLY WALWORTH THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 NW PHP TO 50 SW MBG TO 5 SE MBG TO 40 NE MBG TO 45 E BIS TO 45 ENE BIS TO 35 NNW JMS TO 35 SSE DVL. ..WENDT..08/26/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC029-043-047-051-093-260240- ND . NORTH DAKOTA COUNTIES INCLUDED ARE EMMONS KIDDER LOGAN MCINTOSH STUTSMAN SDC017-021-041-045-049-059-065-069-075-085-089-107-117-119-129- 260240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUFFALO CAMPBELL DEWEY EDMUNDS FAULK HAND HUGHES HYDE JONES LYMAN MCPHERSON POTTER STANLEY SULLY WALWORTH THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 619 SEVERE TSTM ND SD 252020Z - 260300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 619 NWS Storm Prediction Center Norman OK 320 PM CDT Sun Aug 25 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central North Dakota Central South Dakota * Effective this Sunday afternoon and evening from 320 PM until 1000 PM CDT. * Primary threats include... Scattered large hail likely with isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph likely SUMMARY...Scattered thunderstorm development is expected this afternoon into this evening across the central Dakotas. The storm environment will initially support supercells capable of producing large hail, while storms should merge into clusters and line segments this evening with an attendant threat for damaging gusts. The severe thunderstorm watch area is approximately along and 70 statute miles east and west of a line from 70 miles northeast of Minot ND to 65 miles south southwest of Pierre SD. 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 30020. ...Thompson Read more