528 WWUS20 KWNS 232125 SEL9 SPC WW 232125 IDZ000-UTZ000-WYZ000-240400- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 619 NWS Storm Prediction Center Norman OK 330 PM MDT Sun Aug 23 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southeast Idaho Northern Utah Extreme southwest Wyoming * Effective this Sunday afternoon and evening from 330 PM until 1000 PM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Scattered thunderstorms are expected through late evening as a mix of cells and clusters capable of producing severe outflow gusts of 60-75 mph and isolated large hail up to 1.5 inches in diameter. The severe thunderstorm watch area is approximately along and 70 statute miles east and west of a line from 10 miles east northeast of Pocatello ID to 50 miles southwest of Salt Lake City UT. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 617...WW 618... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 25030. ...Thompson  918 WWUS20 KWNS 232145 SEL0 SPC WW 232145 MTZ000-240400- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 620 NWS Storm Prediction Center Norman OK 350 PM MDT Sun Aug 23 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Eastern Montana * Effective this Sunday afternoon and evening from 350 PM until 1000 PM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Scattered high-based thunderstorms will spread eastward from central into eastern Montana through late evening. A few supercell structures with large hail will be possible initially. The threat for severe outflow gusts of 60-75 mph will increase as storms cluster over time. The severe thunderstorm watch area is approximately along and 100 statute miles east and west of a line from 55 miles north northeast of Glasgow MT to 80 miles southeast of Billings MT. 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 617...WW 618...WW 619... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 27030. ...Thompson  296 WWUS20 KWNS 232155 SEL1 SPC WW 232155 NDZ000-240300- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 621 NWS Storm Prediction Center Norman OK 400 PM MDT Sun Aug 23 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwest North Dakota * Effective this Sunday afternoon and evening from 400 PM until 900 PM 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...A few supercells with large hail up to 2 inches in diameter and isolated severe outflow gusts of 60-75 mph will be possible into this evening. The severe thunderstorm watch area is approximately along and 60 statute miles east and west of a line from 55 miles north of Dickinson ND to 30 miles west of Lemmon SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). 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 617...WW 618...WW 619...WW 620... 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 32015. ...Thompson