URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 459 NWS Storm Prediction Center Norman OK 855 AM CDT Mon Aug 21 2017 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southern South Dakota * Effective this Monday morning and afternoon from 855 AM until 200 PM CDT. * Primary threats include... Isolated very large hail events to 2 inches in diameter possible Isolated damaging wind gusts to 70 mph possible SUMMARY...A pair of intense storms should move east-southeast across south-central SD through midday with a risk of severe hail and wind. The severe thunderstorm watch area is approximately along and 50 statute miles north and south of a line from 90 miles west of Chamberlain SD to 25 miles south of Mitchell SD. 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. && 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 550. Mean storm motion vector 29030. ...GramsRead more
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