URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 432 NWS Storm Prediction Center Norman OK 635 PM MDT Tue Aug 11 2020 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwestern North Dakota Northwestern South Dakota * Effective this Tuesday night and Wednesday morning from 635 PM until 100 AM MDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible Scattered large hail events to 1.5 inches in diameter possible SUMMARY...Clusters of storms forming in southeastern Montana and southwestern North Dakota may persist into the overnight hours while spreading east-southeastward across northwestern South Dakota. Some supercell structures will be possible this evening, while upscale growth into a cluster is expected tonight. The strongest embedded storms will be capable of producing damaging winds and large hail. The severe thunderstorm watch area is approximately along and 45 statute miles north and south of a line from 30 miles northwest of Buffalo SD to 85 miles east southeast of Lemmon SD. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). 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 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 29020. ...ThompsonRead more
from SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0432.html
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