####018002102#### WWUS20 KWNS 152040 SEL1 SPC WW 152040 NEZ000-SDZ000-WYZ000-160400- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 111 NWS Storm Prediction Center Norman OK 240 PM MDT Mon Apr 15 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northwest Nebraska Western and Southern South Dakota Northeast Wyoming * Effective this Monday afternoon and evening from 240 PM until 1000 PM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter likely Scattered damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Scattered thunderstorms will develop late this afternoon through the evening from near the Black Hills east-southeastward into portions of the northern Nebraska and southern South Dakota. The stronger updrafts that develop will probably evolve into supercells. Large hail and severe gusts will be the primary severe hazards with the stronger storms through the mid to late evening. The severe thunderstorm watch area is approximately along and 70 statute miles north and south of a line from 65 miles west of Rapid City SD to 40 miles southeast of Pierre 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 109...WW 110... 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 24035. ...Smith