Severe Storms

WW 0571 Status Updates
STATUS REPORT ON WW 571 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 E CDR TO 30 SW PHP TO 30 NW PHP TO 65 NNE RAP TO 35 SSE 2WX TO 45 SW 2WX TO 25 SSE 4BQ TO 30 SE SHR. ..COOK..08/12/19 ATTN...WFO...BYZ...UNR... STATUS REPORT FOR WT 571 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-011-017-025-075-087-103-120340- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARTER CUSTER FALLON POWDER RIVER ROSEBUD TREASURE SDC007-055-063-071-095-105-121-123-137-120340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BENNETT HAAKON HARDING JACKSON MELLETTE PERKINS TODD TRIPP ZIEBACH WYC033-120340- WY . WYOMING COUNTIES INCLUDED ARE Read more

WW 571 TORNADO MT SD WY 112000Z - 120300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 571 NWS Storm Prediction Center Norman OK 200 PM MDT Sun Aug 11 2019 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southern Montana Western South Dakota Northeast Wyoming * Effective this Sunday afternoon and evening from 200 PM until 900 PM MDT. * Primary threats include... A couple tornadoes possible Scattered damaging winds and isolated significant gusts to 80 mph possible Scattered large hail and isolated very large hail events to 3 inches in diameter possible SUMMARY...Multiple discrete supercells will progress east-northeast from northeast Wyoming and south-central Montana. Large hail and a couple tornadoes should be the primary threat during the first few hours. Severe wind gust potential will increase later into the evening as cells likely consolidate into one or more clusters, especially across southern Montana. The tornado watch area is approximately along and 85 statute miles north and south of a line from 20 miles west northwest of Billings MT to 50 miles northeast of Rapid City SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and 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. && OTHER WATCH INFORMATION...CONTINUE...WW 569...WW 570... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 24030. ...Grams Read more

MD 1710 CONCERNING TORNADO WATCH 572... FOR SOUTHERN NEBRASKA AND NORTHERN KANSAS
Mesoscale Discussion 1710 NWS Storm Prediction Center Norman OK 0911 PM CDT Sun Aug 11 2019 Areas affected...southern Nebraska and northern Kansas Concerning...Tornado Watch 572... Valid 120211Z - 120415Z The severe weather threat for Tornado Watch 572 continues. SUMMARY...Tornado risk has diminished some across the watch, while risk for damaging winds and marginal hail continues. Wind risk is expected to spread eastward out of the watch over the next couple of hours, with new WW expected. DISCUSSION...Latest radar loop shows that earlier, supercell storms have congealed into an eastward-moving storm cluster, with a rather strong mesolow moving out of Cheyenne and into Rawlins County in Kansas. At this time, it appears that damaging wind risk will not only continue within WW 572, but will also spread eastward, downstream of the watch with time. Given the very moist boundary layer/unstable airmass in place across the central Plains, risk will likely warrant new watch issuance, possibly including southeast Nebraska and northeast Kansas. ..Goss/Hart.. 08/12/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OAX...TOP...ICT...GID...LBF...DDC...GLD...PUB... BOU... LAT...LON 38510213 39310258 40380193 41020228 41320199 41390043 41589705 39409669 38179817 38280111 38300188 38510213 Read more

MD 1709 CONCERNING SEVERE THUNDERSTORM WATCH 573... FOR NORTHEASTERN MONTANA
Mesoscale Discussion 1709 NWS Storm Prediction Center Norman OK 0838 PM CDT Sun Aug 11 2019 Areas affected...northeastern Montana Concerning...Severe Thunderstorm Watch 573... Valid 120138Z - 120245Z The severe weather threat for Severe Thunderstorm Watch 573 continues. SUMMARY...The severe threat continues across WW 573. DISCUSSION...Storms have congealed into a forward-propagating linear complex over the past couple of hours while migrating eastward into WW 573. Based on radar and objective analyses, the greatest severe threat with this activity appears to be tied to the southern end of this complex, where surface-based buoyancy is strongest (around 2000 J/kg). Although instability is lower with northward and eastward extent, the organized nature of the convection, 40 kts of deep shear, and weak to moderate instability should foster at least an isolated, yet continued threat for damaging wind gusts as storms move through the WW. Storms should reach the eastern extent of the WW through 05Z or so, though it is uncertain whether storms will maintain their intensity with eastward extent toward the MT/ND border region where surface temperatures cool into the mid 60s F. Behind the line, the severe threat will diminish such that those portions of WW 573 may be cancelled early. ..Cook.. 08/12/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BIS...BYZ...GGW...TFX... LAT...LON 48970818 49150704 49080482 48660400 47370389 46680388 46480477 46540599 46650718 46620795 46780847 47760863 48410851 48970818 Read more

WW 0572 Status Updates
STATUS REPORT ON WW 572 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 SW ITR TO 35 SSW IML TO 40 W IML. ..GOSS..08/12/19 ATTN...WFO...GLD...LBF... STATUS REPORT FOR WT 572 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC017-063-120240- CO . COLORADO COUNTIES INCLUDED ARE CHEYENNE KIT CARSON KSC023-039-063-071-109-153-179-181-193-199-203-120240- KS . KANSAS COUNTIES INCLUDED ARE CHEYENNE DECATUR GOVE GREELEY LOGAN RAWLINS SHERIDAN SHERMAN THOMAS WALLACE WICHITA NEC029-049-057-063-085-087-101-111-135-145-120240- NE . NEBRASKA COUNTIES INCLUDED ARE CHASE DEUEL DUNDY Read more

WW 0571 Status Updates
STATUS REPORT ON WW 571 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..COOK..08/12/19 ATTN...WFO...BYZ...UNR... STATUS REPORT FOR WT 571 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-009-011-017-025-037-065-075-087-095-103-111-120240- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARBON CARTER CUSTER FALLON GOLDEN VALLEY MUSSELSHELL POWDER RIVER ROSEBUD STILLWATER TREASURE YELLOWSTONE SDC019-033-047-063-081-093-102-103-105-120240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER HARDING LAWRENCE MEADE OGLALA LAKOTA PENNINGTON PERKINS WYC005-011-033-045-120240- WY . WYOMING COUNTIES INCLUDED ARE Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..COOK..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-033-055-069-071-079-083-085-105-109-120240- MT . MONTANA COUNTIES INCLUDED ARE DAWSON GARFIELD MCCONE PETROLEUM PHILLIPS PRAIRIE RICHLAND ROOSEVELT VALLEY WIBAUX 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 0759 PM CDT Sun Aug 11 2019 Valid 120100Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF MT AND ALONG THE KS/NE BORDER... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. Damaging wind gusts, and large hail remain possible. ...01z Update... Strong convection that developed off the higher terrain of southeast WY/CO is gradually maturing as it advances east into more moist/buoyant air mass, especially along the NE/KS border. Latest diagnostic data exhibits seasonally large CAPE values with adequate shear for an upward evolving MCS. Organizing cluster of storms over northeast CO/northwest KS is expected to propagate east this evening, just north of a synoptic front draped along the I-70 corridor. As this activity matures, damaging wind threat should increase, especially if a bow-type squall line evolves. Farther north, strongly forced convection over central MT is spreading east into the northern High Plains. This activity is expected to remain organized, possibly evolving into an MCS as it approaches the ND border region. With LLJ expected to focus across western Dakotas tonight, a long-lived convective event seems likely. ..Darrow.. 08/12/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sun Aug 11 2019 Valid 120100Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF MT AND ALONG THE KS/NE BORDER... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. Damaging wind gusts, and large hail remain possible. ...01z Update... Strong convection that developed off the higher terrain of southeast WY/CO is gradually maturing as it advances east into more moist/buoyant air mass, especially along the NE/KS border. Latest diagnostic data exhibits seasonally large CAPE values with adequate shear for an upward evolving MCS. Organizing cluster of storms over northeast CO/northwest KS is expected to propagate east this evening, just north of a synoptic front draped along the I-70 corridor. As this activity matures, damaging wind threat should increase, especially if a bow-type squall line evolves. Farther north, strongly forced convection over central MT is spreading east into the northern High Plains. This activity is expected to remain organized, possibly evolving into an MCS as it approaches the ND border region. With LLJ expected to focus across western Dakotas tonight, a long-lived convective event seems likely. ..Darrow.. 08/12/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sun Aug 11 2019 Valid 120100Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF MT AND ALONG THE KS/NE BORDER... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. Damaging wind gusts, and large hail remain possible. ...01z Update... Strong convection that developed off the higher terrain of southeast WY/CO is gradually maturing as it advances east into more moist/buoyant air mass, especially along the NE/KS border. Latest diagnostic data exhibits seasonally large CAPE values with adequate shear for an upward evolving MCS. Organizing cluster of storms over northeast CO/northwest KS is expected to propagate east this evening, just north of a synoptic front draped along the I-70 corridor. As this activity matures, damaging wind threat should increase, especially if a bow-type squall line evolves. Farther north, strongly forced convection over central MT is spreading east into the northern High Plains. This activity is expected to remain organized, possibly evolving into an MCS as it approaches the ND border region. With LLJ expected to focus across western Dakotas tonight, a long-lived convective event seems likely. ..Darrow.. 08/12/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0759 PM CDT Sun Aug 11 2019 Valid 120100Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF MT AND ALONG THE KS/NE BORDER... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. Damaging wind gusts, and large hail remain possible. ...01z Update... Strong convection that developed off the higher terrain of southeast WY/CO is gradually maturing as it advances east into more moist/buoyant air mass, especially along the NE/KS border. Latest diagnostic data exhibits seasonally large CAPE values with adequate shear for an upward evolving MCS. Organizing cluster of storms over northeast CO/northwest KS is expected to propagate east this evening, just north of a synoptic front draped along the I-70 corridor. As this activity matures, damaging wind threat should increase, especially if a bow-type squall line evolves. Farther north, strongly forced convection over central MT is spreading east into the northern High Plains. This activity is expected to remain organized, possibly evolving into an MCS as it approaches the ND border region. With LLJ expected to focus across western Dakotas tonight, a long-lived convective event seems likely. ..Darrow.. 08/12/2019 Read more

WW 0573 Status Updates
STATUS REPORT ON WW 573 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..COOK..08/12/19 ATTN...WFO...GGW... STATUS REPORT FOR WS 573 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC021-033-055-069-071-079-083-085-105-109-120140- MT . MONTANA COUNTIES INCLUDED ARE DAWSON GARFIELD MCCONE PETROLEUM PHILLIPS PRAIRIE RICHLAND ROOSEVELT VALLEY WIBAUX 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 0571 Status Updates
STATUS REPORT ON WW 571 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1707 ..COOK..08/12/19 ATTN...WFO...BYZ...UNR... STATUS REPORT FOR WT 571 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-009-011-017-025-037-065-075-087-095-103-111-120140- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARBON CARTER CUSTER FALLON GOLDEN VALLEY MUSSELSHELL POWDER RIVER ROSEBUD STILLWATER TREASURE YELLOWSTONE SDC019-033-047-063-081-093-102-103-105-120140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER HARDING LAWRENCE MEADE OGLALA LAKOTA PENNINGTON PERKINS WYC005-011-033-045-120140- WY Read more

MD 1708 CONCERNING SEVERE THUNDERSTORM WATCH 570... FOR NORTHEAST COLORADO AND WESTERN NEBRASKA
Mesoscale Discussion 1708 NWS Storm Prediction Center Norman OK 0713 PM CDT Sun Aug 11 2019 Areas affected...northeast Colorado and western Nebraska Concerning...Severe Thunderstorm Watch 570... Valid 120013Z - 120215Z The severe weather threat for Severe Thunderstorm Watch 570 continues. SUMMARY...Severe weather continues moving quickly eastward across WW 570, and will shift east of the watch in northwest Nebraska over the next hour. A new WW may be needed. DISCUSSION...Latest radar loop shows storms now accelerating eastward across WW 570, moving into downstream Tornado Watch 572 in southwest Nebraska/northwest Kansas and far northeast Colorado. Farther north, storms will begin moving out of the watch across northwest Nebraska. With risk for primarily damaging winds potentially accompanying this convection as it exits the eastern fringe of WW 572, a new WW, or WW extension in area, may be needed. ..Goss.. 08/12/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR...GLD...PUB...BOU...CYS... LAT...LON 38500338 38810394 39880361 40590369 42080385 42840368 43200127 42630032 41710052 41350229 40710248 38500338 Read more

WW 0569 Status Updates
STATUS REPORT ON WW 569 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 ENE WEY TO 25 NNE LVM TO 20 SW LWT TO 50 S HVR. ..COOK..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC027-097-107-120040- MT . MONTANA COUNTIES INCLUDED ARE FERGUS SWEET GRASS WHEATLAND 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 0569 Status Updates
STATUS REPORT ON WW 569 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 ENE WEY TO 25 NNE LVM TO 20 SW LWT TO 50 S HVR. ..COOK..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC027-097-107-120040- MT . MONTANA COUNTIES INCLUDED ARE FERGUS SWEET GRASS WHEATLAND 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 0569 Status Updates
STATUS REPORT ON WW 569 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 ENE WEY TO 25 NNE LVM TO 20 SW LWT TO 50 S HVR. ..COOK..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC027-097-107-120040- MT . MONTANA COUNTIES INCLUDED ARE FERGUS SWEET GRASS WHEATLAND 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 0569 Status Updates
STATUS REPORT ON WW 569 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 ENE WEY TO 25 NNE LVM TO 20 SW LWT TO 50 S HVR. ..COOK..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC027-097-107-120040- MT . MONTANA COUNTIES INCLUDED ARE FERGUS SWEET GRASS WHEATLAND 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 0570 Status Updates
STATUS REPORT ON WW 570 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NNW PUB TO 30 WSW AKO TO 30 ESE CYS TO 60 WNW CDR. ..GOSS..08/11/19 ATTN...WFO...BOU...CYS... STATUS REPORT FOR WS 570 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC039-073-075-087-095-115-121-120040- CO . COLORADO COUNTIES INCLUDED ARE ELBERT LINCOLN LOGAN MORGAN PHILLIPS SEDGWICK WASHINGTON NEC007-013-033-045-105-123-157-165-120040- NE . NEBRASKA COUNTIES INCLUDED ARE BANNER BOX BUTTE CHEYENNE DAWES KIMBALL MORRILL SCOTTS BLUFF SIOUX 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 0570 Status Updates
STATUS REPORT ON WW 570 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NNW PUB TO 30 WSW AKO TO 30 ESE CYS TO 60 WNW CDR. ..GOSS..08/11/19 ATTN...WFO...BOU...CYS... STATUS REPORT FOR WS 570 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC039-073-075-087-095-115-121-120040- CO . COLORADO COUNTIES INCLUDED ARE ELBERT LINCOLN LOGAN MORGAN PHILLIPS SEDGWICK WASHINGTON NEC007-013-033-045-105-123-157-165-120040- NE . NEBRASKA COUNTIES INCLUDED ARE BANNER BOX BUTTE CHEYENNE DAWES KIMBALL MORRILL SCOTTS BLUFF SIOUX 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