NOAA
SPC Severe Thunderstorm Watch 645
WW 645 SEVERE TSTM MT 232055Z – 240300Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 645 NWS Storm Prediction Center Norman OK 255 PM MDT Fri Aug 23 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western and Central Montana * Effective this Friday afternoon and evening from 255 PM until 900 PM MDT. * Primary threats include... Isolated significant damaging wind gusts to 75 mph possible SUMMARY...Scattered thunderstorms will continue to develop and move north-northeastward across the region through early evening, with severe-caliber wind gusts a possibility. The severe thunderstorm watch area is approximately along and 95 statute miles east and west of a line from 25 miles north of Cut Bank MT to 40 miles south of Dillon MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU5). 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 1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 20030. ...Guyer
SPC – No watches are valid as of Fri Aug 23 05:02:01 UTC 2024
No watches are valid as of Fri Aug 23 05:02:01 UTC 2024.
SPC Severe Thunderstorm Watch 644
WW 644 SEVERE TSTM CO KS NE 222325Z – 230500Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 644 NWS Storm Prediction Center Norman OK 525 PM MDT Thu Aug 22 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Eastern Colorado Western Kansas Far Southwest Nebraska * Effective this Thursday afternoon and evening from 525 PM until 1100 PM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph possible Isolated very large hail events to 2 inches in diameter possible SUMMARY...Thunderstorms should continue to congeal into a cluster this evening while moving eastward across eastern Colorado into western Kansas, with mainly a threat for scattered severe/damaging winds around 60-70 mph. Isolated gusts up to 75 mph appear possible, along with occasional large hail around 1-1.75 inches in diameter. The severe thunderstorm watch area is approximately along and 60 statute miles north and south of a line from 5 miles north northwest of Limon CO to 50 miles east northeast of Goodland KS. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). 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 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25025. ...Gleason
SPC – No watches are valid as of Thu Aug 22 04:33:02 UTC 2024
No watches are valid as of Thu Aug 22 04:33:02 UTC 2024.
SPC Severe Thunderstorm Watch 643
WW 643 SEVERE TSTM MT 220025Z – 220700Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 643 NWS Storm Prediction Center Norman OK 625 PM MDT Wed Aug 21 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northeast Montana * Effective this Wednesday night and Thursday morning from 625 PM until 100 AM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph possible Scattered large hail and isolated very large hail events to 2.5 inches in diameter possible SUMMARY...Thunderstorms should continue to intensify this evening across parts of northeast Montana, while posing a threat for large to very large hail around 1.5-2.5 inches in diameter, along with severe/damaging winds up to 65-75 mph. The severe thunderstorm watch area is approximately along and 120 statute miles east and west of a line from 50 miles north of Glasgow MT to 95 miles south of Glasgow MT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). 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 642... AVIATION...A few severe thunderstorms with hail surface and aloft to 2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 26025. ...Gleason
SPC Severe Thunderstorm Watch 642
WW 642 SEVERE TSTM MT SD 212100Z – 220400Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 642 NWS Storm Prediction Center Norman OK 400 PM CDT Wed Aug 21 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southeast Montana Western South Dakota * Effective this Wednesday afternoon and evening from 400 PM until 1100 PM CDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail and isolated very large hail events to 2 inches in diameter possible SUMMARY...Thunderstorms will develop across southeast Montana and western South Dakota through the afternoon and evening. The strongest cells may produce damaging winds and large hail. The severe thunderstorm watch area is approximately along and 55 statute miles north and south of a line from 145 miles west northwest of Broadus MT to 25 miles north northeast of Philip SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). 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 25030. ...Hart