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SEL1 URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 661 NWS Storm Prediction Center Norman OK 440 PM CDT Wed Aug 28 2024 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of South central North Dakota North central South Dakota * Effective this Wednesday afternoon and evening from 440 PM until 1100 PM CDT. * Primary threats include... A few tornadoes possible Scattered large hail and isolated very large hail events to 3 inches in diameter likely Scattered damaging wind gusts to 70 mph possible SUMMARY...Supercell development is expected soon near the central North Dakota/South Dakota border, with additional storm development in the next 1-3 hours farther north and south in the watch area. The storm environment initially favors supercells with tornadoes and very large hail (up to 3 inches in diameter), while some clustering of storms later this evening will lead to some increase in the potential for damaging winds of 60-70 mph. The tornado watch area is approximately along and 60 statute miles east and west of a line from 40 miles east northeast of Garrison ND to 80 miles south southeast of Mobridge SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU1). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Tornado Watch means conditions are favorable for tornadoes and 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. && AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 3 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 25015. ...Thompson