Severe Storms

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

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Sun Aug 25 2019 Valid 260100Z - 261200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE CENTRAL DAKOTAS ARCING INTO NORTHEAST WYOMING... ...SUMMARY... Thunderstorms with isolated large hail and severe gusts are expected over the central Dakotas arcing westward into northeast Wyoming this evening. ...Northern Great Plains... Water-vapor imagery this evening shows an amplifying mid-level trough over MT which is forecast to reach the Dakotas late tonight. A couple of strong to severe thunderstorm clusters are over the central Dakotas this evening near a pre-frontal surface trough and other intensifying severe storms are located near a cold frontal segment over northeast WY. Both boundaries are forecast to move southeast tonight. The 00z North Platte, NE raob sampled a moisture-rich boundary layer (13 g/kg lowest 100mb mean mixing ratio) which likely extends into the central Dakotas. Moderate instability and the increasing westerly flow moving east through the base of the shortwave trough, will combine to favor storm organization and intensity through the evening. A longer-term risk for severe storms will probably occur with the northeast WY storms as they move east-southeastward into western SD and towards far northern NE on the leading edge of stronger mid-level forcing for ascent. Large hail and severe gusts are the primary risks with the stronger storms. A gradual diminishing in storm coverage and intensity are expected by the late overnight hours. ..Smith.. 08/26/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Sun Aug 25 2019 Valid 260100Z - 261200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE CENTRAL DAKOTAS ARCING INTO NORTHEAST WYOMING... ...SUMMARY... Thunderstorms with isolated large hail and severe gusts are expected over the central Dakotas arcing westward into northeast Wyoming this evening. ...Northern Great Plains... Water-vapor imagery this evening shows an amplifying mid-level trough over MT which is forecast to reach the Dakotas late tonight. A couple of strong to severe thunderstorm clusters are over the central Dakotas this evening near a pre-frontal surface trough and other intensifying severe storms are located near a cold frontal segment over northeast WY. Both boundaries are forecast to move southeast tonight. The 00z North Platte, NE raob sampled a moisture-rich boundary layer (13 g/kg lowest 100mb mean mixing ratio) which likely extends into the central Dakotas. Moderate instability and the increasing westerly flow moving east through the base of the shortwave trough, will combine to favor storm organization and intensity through the evening. A longer-term risk for severe storms will probably occur with the northeast WY storms as they move east-southeastward into western SD and towards far northern NE on the leading edge of stronger mid-level forcing for ascent. Large hail and severe gusts are the primary risks with the stronger storms. A gradual diminishing in storm coverage and intensity are expected by the late overnight hours. ..Smith.. 08/26/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Sun Aug 25 2019 Valid 260100Z - 261200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE CENTRAL DAKOTAS ARCING INTO NORTHEAST WYOMING... ...SUMMARY... Thunderstorms with isolated large hail and severe gusts are expected over the central Dakotas arcing westward into northeast Wyoming this evening. ...Northern Great Plains... Water-vapor imagery this evening shows an amplifying mid-level trough over MT which is forecast to reach the Dakotas late tonight. A couple of strong to severe thunderstorm clusters are over the central Dakotas this evening near a pre-frontal surface trough and other intensifying severe storms are located near a cold frontal segment over northeast WY. Both boundaries are forecast to move southeast tonight. The 00z North Platte, NE raob sampled a moisture-rich boundary layer (13 g/kg lowest 100mb mean mixing ratio) which likely extends into the central Dakotas. Moderate instability and the increasing westerly flow moving east through the base of the shortwave trough, will combine to favor storm organization and intensity through the evening. A longer-term risk for severe storms will probably occur with the northeast WY storms as they move east-southeastward into western SD and towards far northern NE on the leading edge of stronger mid-level forcing for ascent. Large hail and severe gusts are the primary risks with the stronger storms. A gradual diminishing in storm coverage and intensity are expected by the late overnight hours. ..Smith.. 08/26/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733 PM CDT Sun Aug 25 2019 Valid 260100Z - 261200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE CENTRAL DAKOTAS ARCING INTO NORTHEAST WYOMING... ...SUMMARY... Thunderstorms with isolated large hail and severe gusts are expected over the central Dakotas arcing westward into northeast Wyoming this evening. ...Northern Great Plains... Water-vapor imagery this evening shows an amplifying mid-level trough over MT which is forecast to reach the Dakotas late tonight. A couple of strong to severe thunderstorm clusters are over the central Dakotas this evening near a pre-frontal surface trough and other intensifying severe storms are located near a cold frontal segment over northeast WY. Both boundaries are forecast to move southeast tonight. The 00z North Platte, NE raob sampled a moisture-rich boundary layer (13 g/kg lowest 100mb mean mixing ratio) which likely extends into the central Dakotas. Moderate instability and the increasing westerly flow moving east through the base of the shortwave trough, will combine to favor storm organization and intensity through the evening. A longer-term risk for severe storms will probably occur with the northeast WY storms as they move east-southeastward into western SD and towards far northern NE on the leading edge of stronger mid-level forcing for ascent. Large hail and severe gusts are the primary risks with the stronger storms. A gradual diminishing in storm coverage and intensity are expected by the late overnight hours. ..Smith.. 08/26/2019 Read more

WW 0620 Status Updates
STATUS FOR WATCH 0620 HAS NOT BEEN ISSUED YET Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 S Y22 TO 40 SE Y22 TO 50 SSW BIS TO 30 SSW BIS TO 5 SSE BIS TO 35 N BIS TO 35 SE MOT TO 30 ESE MOT TO 40 NE MOT TO 55 NNE MOT. ..WENDT..08/26/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC005-015-027-029-031-043-047-051-069-079-083-085-093-095-103- 260140- ND . NORTH DAKOTA COUNTIES INCLUDED ARE BENSON BURLEIGH EDDY EMMONS FOSTER KIDDER LOGAN MCINTOSH PIERCE ROLETTE SHERIDAN SIOUX STUTSMAN TOWNER WELLS SDC007-017-021-031-041-045-049-055-059-065-069-071-075-085-089- 095-107-117-119-121-123-129-137-260140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT BUFFALO CAMPBELL CORSON DEWEY EDMUNDS FAULK HAAKON HAND HUGHES HYDE JACKSON JONES LYMAN MCPHERSON Read more

MD 1859 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR NORTHEASTERN WYOMING...BLACK HILLS VICINITY
Mesoscale Discussion 1859 NWS Storm Prediction Center Norman OK 0715 PM CDT Sun Aug 25 2019 Areas affected...Northeastern Wyoming...Black Hills vicinity Concerning...Severe potential...Watch likely Valid 260015Z - 260215Z Probability of Watch Issuance...80 percent SUMMARY...Storms capable of large hail are likely this evening/overnight. An upgrade to Slight Risk in the highlighted area will be forthcoming in the 01Z Convective Outlook. A WW is also being considered. DISCUSSION...Storms have rapidly intensified in northeast Wyoming early this evening. With subtle mid-level ascent approaching, this activity is likely to continue. While buoyancy will generally be weak, mid-level lapse rates of 8+ C/km, strong effective shear, and long hodographs will support a threat for large hail. Buoyancy will increase to 500-1000 J/kg MLCAPE as storms enter southwest South Dakota. Furthermore, a modest increase in the low-level jet across western Nebraska into southwest will also support continued storm activity this evening. A upgrade to Slight Risk for this area for the 01Z Convective Outlook is forthcoming. A WW is also being considered for this region. ..Wendt/Guyer.. 08/26/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...UNR...CYS... LAT...LON 44160587 44800575 44960501 44630337 44280234 43560244 43120283 43080386 43410455 44160587 Read more

WW 0619 Status Updates
STATUS REPORT ON WW 619 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 N Y22 TO 25 SSW N60 TO 10 NW N60 TO 5 WSW MOT TO 20 NW MOT TO 40 NW MOT. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1858 ..WENDT..08/25/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC005-009-015-027-029-031-037-043-047-049-051-055-059-065-069- 075-079-083-085-093-095-101-103-260040- ND . NORTH DAKOTA COUNTIES INCLUDED ARE BENSON BOTTINEAU BURLEIGH EDDY EMMONS FOSTER GRANT KIDDER LOGAN MCHENRY MCINTOSH MCLEAN MORTON OLIVER PIERCE RENVILLE ROLETTE SHERIDAN SIOUX STUTSMAN TOWNER WARD WELLS SDC007-017-021-031-041-045-049-055-059-065-069-071-075-085-089- 095-107-117-119-121-123-129-137-260040- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT BUFFALO CAMPBELL 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

MD 1858 CONCERNING SEVERE THUNDERSTORM WATCH 619... FOR CENTRAL NORTH DAKOTA AND SOUTH DAKOTA
Mesoscale Discussion 1858 NWS Storm Prediction Center Norman OK 0558 PM CDT Sun Aug 25 2019 Areas affected...Central North Dakota and South Dakota Concerning...Severe Thunderstorm Watch 619... Valid 252258Z - 260100Z The severe weather threat for Severe Thunderstorm Watch 619 continues. SUMMARY...Threat for large hail and strong/severe wind gusts will continue into the early evening in portions of WW 619. Storms within North Dakota have generally grown upscale which will limit the severe hail threat. Activity in increasing in central South Dakota. Eastern extent of the threat will be limited by low-level stratus/stable air to the east. Local extension in area of WW 619 may be needed if storms in southwestern South Dakota increase in intensity. DISCUSSION...A few supercell structures produced several reports of severe hail, some of which were 2+ inches, across central North Dakota in the last two hours. Much of this activity has congealed into a linear cluster north of Bismarck. This cluster will likely pose some threat of severe hail and strong/severe wind gusts as it drifts slowly southward within the axis of greatest buoyancy. Activity will be limited in how far east it can progress with very stable air in place. Overall severe threat will diminish from west to east in North Dakota as the cold front continues to move east. Farther south, storms have been slow to initiate but activity has increased within the pre-frontal trough west of Pierre. More nebulous forcing for ascent will likely mean less storm coverage than points northward. Nevertheless, a narrow corridor of 1500-2000 J/kg and 35-40 kts of effective shear will support a threat for large hail and strong/severe wind gusts into the early evening. Storms within the Black Hills and SD/NE border have generally remained below severe limits to this point. Should this activity increase in intensity, a local areal extension of WW 619 may be needed. ..Wendt.. 08/25/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FGF...ABR...BIS...UNR... LAT...LON 46330183 48200172 48860125 48970042 48859951 47479889 45699889 44719917 43909941 43499990 43440098 43780165 44560187 46330183 Read more

No Mesoscale Discussions are in effect as of Sun Aug 25 21:46:05 UTC 2019.

WW 0619 Status Updates
STATUS REPORT ON WW 619 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..WENDT..08/25/19 ATTN...WFO...FGF...BIS...ABR...UNR... STATUS REPORT FOR WS 619 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS NDC005-009-015-027-029-031-037-043-047-049-051-055-057-059-065- 069-075-079-083-085-093-095-101-103-252240- ND . NORTH DAKOTA COUNTIES INCLUDED ARE BENSON BOTTINEAU BURLEIGH EDDY EMMONS FOSTER GRANT KIDDER LOGAN MCHENRY MCINTOSH MCLEAN MERCER MORTON OLIVER PIERCE RENVILLE ROLETTE SHERIDAN SIOUX STUTSMAN TOWNER WARD WELLS SDC017-021-031-041-045-049-055-059-065-069-071-075-085-089-095- 107-117-119-123-129-137-252240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUFFALO CAMPBELL CORSON DEWEY EDMUNDS FAULK HAAKON HAND HUGHES HYDE JACKSON JONES Read more

WW 0619 Status Updates
STATUS FOR WATCH 0619 HAS NOT BEEN ISSUED YET Read more

No watches are valid as of Sun Aug 25 19:58:01 UTC 2019.