WW 637 SEVERE TSTM SD 122040Z – 130300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 637 NWS Storm Prediction Center Norman OK 240 PM MDT Sat Aug 12 2023 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western South Dakota * Effective this Saturday afternoon and evening from 240 PM until 900 PM MDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Initially isolated thunderstorms near the Black Hills will gradually increase in coverage this evening as the storms develop eastward east of the Black Hills. Large hail will be possible with supercells through this evening. The risk for severe gusts will probably increase once storm coverage increases. The severe thunderstorm watch area is approximately along and 55 statute miles east and west of a line from 45 miles north northeast of Rapid City SD to 80 miles south southwest of Philip SD. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 633...WW 634...WW 635...WW 636... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 29025. ...Smith
