Severe Storms

WW 567 SEVERE TSTM ID MT 101935Z - 110300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 567 NWS Storm Prediction Center Norman OK 135 PM MDT Sat Aug 10 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Idaho Western Montana * Effective this Saturday afternoon and evening from 135 PM until 900 PM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Scattered thunderstorms will develop from the Oregon-Idaho border region across southwest Montana. Some of these should become strong to severe, producing large hail and damaging winds. The severe thunderstorm watch area is approximately along and 115 statute miles north and south of a line from 35 miles west northwest of Boise ID to 60 miles southeast of Helena MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU7). 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 21030. ...Grams Read more

MD 1695 CONCERNING SEVERE THUNDERSTORM WATCH 567...568... FOR SOUTHERN MONTANA...NORTHEAST WYOMING...AND WESTERN SOUTH DAKOTA
Mesoscale Discussion 1695 NWS Storm Prediction Center Norman OK 0934 PM CDT Sat Aug 10 2019 Areas affected...southern Montana...northeast Wyoming...and western South Dakota Concerning...Severe Thunderstorm Watch 567...568... Valid 110234Z - 110400Z The severe weather threat for Severe Thunderstorm Watch 567, 568 continues. SUMMARY...Local severe risk -- mainly in the form of gusty/damaging winds -- continues, but should gradually diminish over the next 1-2 hours. DISCUSSION...Latest IR satellite and radar loops show convection gradually decreasing in intensity across WW 567 and 568, with the most persistent/intense storms occurring across portions of southwestern Montana, as well as over northeast Wyoming -- within WW 568. Here, local severe risk continues. Otherwise, a continued diurnally driven decrease in storm intensity is expected through watch expiration. ..Goss.. 08/11/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...UNR...CYS...BYZ...GGW...RIW...TFX...MSO... LAT...LON 46151044 45941209 46771247 46911068 46490559 44910197 42710179 43320697 44920754 46150994 46151044 Read more

WW 0568 Status Updates
STATUS REPORT ON WW 568 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NNW DGW TO 35 SW GCC TO 40 E SHR TO 55 NNE SHR TO 55 E BIL TO 20 N BIL TO 30 WSW 3HT. ..COOK..08/11/19 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 568 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC011-037-065-075-087-103-107-110240- MT . MONTANA COUNTIES INCLUDED ARE CARTER GOLDEN VALLEY MUSSELSHELL POWDER RIVER ROSEBUD TREASURE WHEATLAND SDC019-033-047-081-093-102-103-110240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER LAWRENCE MEADE OGLALA LAKOTA PENNINGTON WYC005-011-045-110240- WY . WYOMING COUNTIES INCLUDED ARE Read more

WW 0567 Status Updates
STATUS REPORT ON WW 567 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 WNW MYL TO 15 ENE MYL TO 30 SSW SMN TO 30 WNW MQM TO 20 SSE DLN TO 25 ENE DLN TO 10 ESE HLN TO 25 E GTF. ..COOK..08/11/19 ATTN...WFO...BOI...MSO...PIH...TFX... STATUS REPORT FOR WS 567 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IDC001-003-015-027-037-039-045-073-075-085-087-110240- ID . IDAHO COUNTIES INCLUDED ARE ADA ADAMS BOISE CANYON CUSTER ELMORE GEM OWYHEE PAYETTE VALLEY WASHINGTON MTC007-027-031-043-045-057-059-110240- MT . MONTANA COUNTIES INCLUDED ARE BROADWATER FERGUS GALLATIN JEFFERSON JUDITH BASIN MADISON MEAGHER 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 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743 PM CDT Sat Aug 10 2019 Valid 110100Z - 111200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN ROCKIES/HIGH PLAINS AND THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue this evening across the northern Rockies region into the central High Plains. Wind and hail remain the primary threats. ...01z Update... Scattered robust convection continues across the northern Rockies, arcing east-southeast over southern MT into the Black Hills region. This activity is partly driven by a weak short-wave trough that is ejecting across western MT ahead of the main Pacific northwest trough. Given the large-scale support, scattered severe thunderstorms should focus along a corridor primarily across southern MT into northeast WY through late evening. Farther south across the central High Plains, scattered thunderstorms developed within easterly low-level flow regime over northeast CO/southwest NE. This activity is beginning to cluster and an MCS may ultimately evolve over south-central NE/north-central KS along nose of LLJ. Have adjusted severe probs to account for this higher severe probability development. ..Darrow.. 08/11/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743 PM CDT Sat Aug 10 2019 Valid 110100Z - 111200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN ROCKIES/HIGH PLAINS AND THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue this evening across the northern Rockies region into the central High Plains. Wind and hail remain the primary threats. ...01z Update... Scattered robust convection continues across the northern Rockies, arcing east-southeast over southern MT into the Black Hills region. This activity is partly driven by a weak short-wave trough that is ejecting across western MT ahead of the main Pacific northwest trough. Given the large-scale support, scattered severe thunderstorms should focus along a corridor primarily across southern MT into northeast WY through late evening. Farther south across the central High Plains, scattered thunderstorms developed within easterly low-level flow regime over northeast CO/southwest NE. This activity is beginning to cluster and an MCS may ultimately evolve over south-central NE/north-central KS along nose of LLJ. Have adjusted severe probs to account for this higher severe probability development. ..Darrow.. 08/11/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743 PM CDT Sat Aug 10 2019 Valid 110100Z - 111200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN ROCKIES/HIGH PLAINS AND THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue this evening across the northern Rockies region into the central High Plains. Wind and hail remain the primary threats. ...01z Update... Scattered robust convection continues across the northern Rockies, arcing east-southeast over southern MT into the Black Hills region. This activity is partly driven by a weak short-wave trough that is ejecting across western MT ahead of the main Pacific northwest trough. Given the large-scale support, scattered severe thunderstorms should focus along a corridor primarily across southern MT into northeast WY through late evening. Farther south across the central High Plains, scattered thunderstorms developed within easterly low-level flow regime over northeast CO/southwest NE. This activity is beginning to cluster and an MCS may ultimately evolve over south-central NE/north-central KS along nose of LLJ. Have adjusted severe probs to account for this higher severe probability development. ..Darrow.. 08/11/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743 PM CDT Sat Aug 10 2019 Valid 110100Z - 111200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN ROCKIES/HIGH PLAINS AND THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue this evening across the northern Rockies region into the central High Plains. Wind and hail remain the primary threats. ...01z Update... Scattered robust convection continues across the northern Rockies, arcing east-southeast over southern MT into the Black Hills region. This activity is partly driven by a weak short-wave trough that is ejecting across western MT ahead of the main Pacific northwest trough. Given the large-scale support, scattered severe thunderstorms should focus along a corridor primarily across southern MT into northeast WY through late evening. Farther south across the central High Plains, scattered thunderstorms developed within easterly low-level flow regime over northeast CO/southwest NE. This activity is beginning to cluster and an MCS may ultimately evolve over south-central NE/north-central KS along nose of LLJ. Have adjusted severe probs to account for this higher severe probability development. ..Darrow.. 08/11/2019 Read more

SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743 PM CDT Sat Aug 10 2019 Valid 110100Z - 111200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN ROCKIES/HIGH PLAINS AND THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms will continue this evening across the northern Rockies region into the central High Plains. Wind and hail remain the primary threats. ...01z Update... Scattered robust convection continues across the northern Rockies, arcing east-southeast over southern MT into the Black Hills region. This activity is partly driven by a weak short-wave trough that is ejecting across western MT ahead of the main Pacific northwest trough. Given the large-scale support, scattered severe thunderstorms should focus along a corridor primarily across southern MT into northeast WY through late evening. Farther south across the central High Plains, scattered thunderstorms developed within easterly low-level flow regime over northeast CO/southwest NE. This activity is beginning to cluster and an MCS may ultimately evolve over south-central NE/north-central KS along nose of LLJ. Have adjusted severe probs to account for this higher severe probability development. ..Darrow.. 08/11/2019 Read more

WW 0567 Status Updates
STATUS REPORT ON WW 567 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1692 ..COOK..08/10/19 ATTN...WFO...BOI...MSO...PIH...TFX... STATUS REPORT FOR WS 567 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IDC001-003-015-027-035-037-039-045-049-059-073-075-085-087- 110040- ID . IDAHO COUNTIES INCLUDED ARE ADA ADAMS BOISE CANYON CLEARWATER CUSTER ELMORE GEM IDAHO LEMHI OWYHEE PAYETTE VALLEY WASHINGTON MTC001-007-023-027-031-039-043-045-049-057-059-061-063-077-081- 093-110040- MT . MONTANA COUNTIES INCLUDED ARE BEAVERHEAD BROADWATER DEER LODGE FERGUS GALLATIN GRANITE JEFFERSON JUDITH BASIN LEWIS AND CLARK MADISON MEAGHER MINERAL MISSOULA POWELL RAVALLI Read more

WW 0568 Status Updates
STATUS REPORT ON WW 568 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1692 ..COOK..08/10/19 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 568 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-009-011-037-065-067-075-087-095-097-103-107-111-110040- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARBON CARTER GOLDEN VALLEY MUSSELSHELL PARK POWDER RIVER ROSEBUD STILLWATER SWEET GRASS TREASURE WHEATLAND YELLOWSTONE SDC019-033-047-081-093-102-103-110040- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER LAWRENCE MEADE OGLALA LAKOTA PENNINGTON WYC003-005-011-019-033-043-045-110040- Read more

MD 1692 CONCERNING SEVERE THUNDERSTORM WATCH 567...568... FOR PORTIONS OF THE PACIFIC NORTHWEST EASTWARD TO THE NORTHERN HIGH PLAINS
Mesoscale Discussion 1692 NWS Storm Prediction Center Norman OK 0553 PM CDT Sat Aug 10 2019 Areas affected...portions of the Pacific Northwest eastward to the northern high Plains Concerning...Severe Thunderstorm Watch 567...568... Valid 102253Z - 110100Z The severe weather threat for Severe Thunderstorm Watch 567, 568 continues. SUMMARY...Scattered strong/locally severe storms continue across a large portion of the northern Intermountain region, and vicinity. Locally damaging winds will remain the primary risk, though large hail also remains possible locally. DISCUSSION...The latest WV loop shows an upper low centered over northern California, with a pronounced dry slot extending from central and southern California across the Great Basin and into southeast Idaho. On either side of -- and near the nose of -- this dry slot, scattered thunderstorms continue to develop late this afternoon. Given the relatively moist/unstable airmass in an anticyclonic arc from eastern portions of the Pacific Northwest across western and northern Idaho and Montana, and into the northern high Plains, expect storms to continue across this region for several hours. A belt of fast/diffluent flow resides across this region -- sandwiched between the northern California upper low, and stout ridging over the central U.S. This flow will continue to support organized/rotating storms, locally capable of gusty/damaging winds and hail. ..Goss.. 08/10/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ABR...BIS...LBF...UNR...CYS...BYZ...GGW...RIW... TFX...PIH...MSO...BOI...LKN...OTX...PDT... LAT...LON 42021689 43411889 45031933 46641810 46811623 47431527 47640889 45710139 42870119 42610259 43230651 44201041 44501382 44031450 41921479 41681651 42021689 Read more

MD 1693 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR EASTERN PORTIONS OF WASHINGTON AND OREGON...AND VICINITY
Mesoscale Discussion 1693 NWS Storm Prediction Center Norman OK 0612 PM CDT Sat Aug 10 2019 Areas affected...eastern portions of Washington and Oregon...and vicinity Concerning...Severe potential...Watch unlikely Valid 102312Z - 110115Z Probability of Watch Issuance...20 percent SUMMARY...Scattered thunderstorms continue to develop across portions of the Pacific Northwest. Local/limited severe risk is evident, though threat does not appear sufficient to warrant WW issuance. DISCUSSION...Latest radar loop shows storm coverage continuing to increase across central and eastern Washington/eastern Oregon, and into adjacent northern Idaho, on the northern and eastern side periphery of an upper low center now indicated over northern California. Cold air aloft associated with this feature is combining with diurnal heating and a seasonally moist airmass to result in weak to moderate destabilization, with mixed-layer CAPE near 500 J/kg across eastern and northern Oregon, and as high as 1000 to 1500 J/kg northward into Washington. Deep-layer flow remains somewhat weak across this region, with stronger flow to the south and east, within the height gradient between the low, and a large area of ridging over the central U.S./Rockies. Still, with ample CAPE and enhanced large-scale ascent across the region, a few stronger cells will remain capable of producing locally gusty/damaging winds, and marginal hail. Activity should begin to gradually wane in intensity after dark, with the onset of diurnal cooling. ..Goss/Hart.. 08/10/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MSO...BOI...OTX...PDT...SEW...PQR... LAT...LON 43121711 43231841 44722043 46382171 47422179 48751991 49201632 48001606 44551657 43121711 Read more

MD 1694 CONCERNING SEVERE POTENTIAL...WATCH POSSIBLE FOR WESTERN AND INTO SOUTHERN SOUTH DAKOTA...FAR NORTHEAST COLORADO...AND NORTHERN KANSAS
Mesoscale Discussion 1694 NWS Storm Prediction Center Norman OK 0632 PM CDT Sat Aug 10 2019 Areas affected...western and into southern South Dakota...far northeast Colorado...and northern Kansas Concerning...Severe potential...Watch possible Valid 102332Z - 110130Z Probability of Watch Issuance...40 percent SUMMARY...Isolated/intense thunderstorms continue across portions of western Nebraska and adjacent northeast Colorado. Locally damaging winds and hail remain possible with these storms, with some potential that risk expands eastward this evening. DISCUSSION...Latest objective analyses indicate a very moist/unstable airmass in place from the Nebraska Panhandle into southern Nebraska/northern Kansas, with a handful of strong/severe storms ongoing -- particularly in the southwest Nebraska/northeast Colorado vicinity. While low- to mid-level flow remains quite weak, stronger westerly winds are indicated above h5 -- through middle portions of the unstable/cloud-bearing layer. Risk for locally damaging winds and hail continues with the ongoing cells, but greater risk could evolve if storms can grow upscale and begin shifting eastward. This evolution seems at least possible, given the westerly flow aloft, the current/apparent congealing of convection over the southwest Nebraska vicinity, and the expected development of a southerly low-level jet over the next few hours. Some CAM output suggests this evolution as well, and given the amount of available CAPE, this could result in sufficient expansion of severe risk to warrant WW consideration. We will continue to monitor convective evolution across this area, for signs of an increase, and eastward advance, of the ongoing storms. ..Goss/Hart.. 08/10/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TOP...ICT...GID...LBF...DDC...GLD...BOU...CYS... LAT...LON 38999912 39680288 40800310 42580402 42860395 42760173 42120081 41109756 39609779 38999912 Read more

MD 1692 CONCERNING SEVERE THUNDERSTORM WATCH 567...568... FOR PORTIONS OF THE PACIFIC NORTHWEST EASTWARD TO THE NORTHERN HIGH PLAINS
Mesoscale Discussion 1692 NWS Storm Prediction Center Norman OK 0553 PM CDT Sat Aug 10 2019 Areas affected...portions of the Pacific Northwest eastward to the northern high Plains Concerning...Severe Thunderstorm Watch 567...568... Valid 102253Z - 110100Z The severe weather threat for Severe Thunderstorm Watch 567, 568 continues. SUMMARY...Scattered strong/locally severe storms continue across a large portion of the northern Intermountain region, and vicinity. Locally damaging winds will remain the primary risk, though large hail also remains possible locally. DISCUSSION...The latest WV loop shows an upper low centered over northern California, with a pronounced dry slot extending from central and southern California across the Great Basin and into southeast Idaho. On either side of -- and near the nose of -- this dry slot, scattered thunderstorms continue to develop late this afternoon. Given the relatively moist/unstable airmass in an anticyclonic arc from eastern portions of the Pacific Northwest across western and northern Idaho and Montana, and into the northern high Plains, expect storms to continue across this region for several hours. A belt of fast/diffluent flow resides across this region -- sandwiched between the northern California upper low, and stout ridging over the central U.S. This flow will continue to support organized/rotating storms, locally capable of gusty/damaging winds and hail. ..Goss.. 08/10/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ABR...BIS...LBF...UNR...CYS...BYZ...GGW...RIW... TFX...PIH...MSO...BOI...LKN...OTX...PDT... LAT...LON 42021689 43411889 45031933 46641810 46811623 47431527 47640889 45710139 42870119 42610259 43230651 44201041 44501382 44031450 41921479 41681651 42021689 Read more

WW 0567 Status Updates
STATUS REPORT ON WW 567 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..COOK..08/10/19 ATTN...WFO...BOI...MSO...PIH...TFX... STATUS REPORT FOR WS 567 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IDC001-003-015-027-035-037-039-045-049-059-073-075-085-087- 102340- ID . IDAHO COUNTIES INCLUDED ARE ADA ADAMS BOISE CANYON CLEARWATER CUSTER ELMORE GEM IDAHO LEMHI OWYHEE PAYETTE VALLEY WASHINGTON MTC001-007-023-027-031-039-043-045-049-057-059-061-063-077-081- 093-102340- MT . MONTANA COUNTIES INCLUDED ARE BEAVERHEAD BROADWATER DEER LODGE FERGUS GALLATIN GRANITE JEFFERSON JUDITH BASIN LEWIS AND CLARK MADISON MEAGHER MINERAL MISSOULA POWELL RAVALLI SILVER BOW Read more

WW 0568 Status Updates
STATUS REPORT ON WW 568 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..COOK..08/10/19 ATTN...WFO...BYZ...UNR...RIW... STATUS REPORT FOR WS 568 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-009-011-037-065-067-075-087-095-097-103-107-111-102340- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARBON CARTER GOLDEN VALLEY MUSSELSHELL PARK POWDER RIVER ROSEBUD STILLWATER SWEET GRASS TREASURE WHEATLAND YELLOWSTONE SDC019-033-047-081-093-102-103-102340- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER LAWRENCE MEADE OGLALA LAKOTA PENNINGTON WYC003-005-011-019-033-043-045-102340- WY . WYOMING COUNTIES INCLUDED ARE Read more

WW 567 SEVERE TSTM ID MT 101935Z - 110300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 567 NWS Storm Prediction Center Norman OK 135 PM MDT Sat Aug 10 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Idaho Western Montana * Effective this Saturday afternoon and evening from 135 PM until 900 PM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Scattered thunderstorms will develop from the Oregon-Idaho border region across southwest Montana. Some of these should become strong to severe, producing large hail and damaging winds. The severe thunderstorm watch area is approximately along and 115 statute miles north and south of a line from 35 miles west northwest of Boise ID to 60 miles southeast of Helena MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU7). 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 21030. ...Grams Read more

WW 568 SEVERE TSTM MT SD WY 102105Z - 110400Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 568 NWS Storm Prediction Center Norman OK 305 PM MDT Sat Aug 10 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southern Montana Western South Dakota Northern Wyoming * Effective this Saturday afternoon and evening from 305 PM until 1000 PM MDT. * Primary threats include... Isolated significant damaging wind gusts to 75 mph possible Isolated very large hail events to 2 inches in diameter possible SUMMARY...Scattered thunderstorms will pose a risk for isolated severe hail and wind into late evening. The severe thunderstorm watch area is approximately along and 75 statute miles north and south of a line from 65 miles south southwest of Harlowton MT to 45 miles east of Rapid City 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. && OTHER WATCH INFORMATION...CONTINUE...WW 567... 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 550. Mean storm motion vector 25030. ...Grams Read more

WW 0568 Status Updates
STATUS FOR WATCH 0568 HAS NOT BEEN ISSUED YET Read more