WUUS53 KFSD 182308 SVRFSD IAC149-167-NEC043-051-SDC027-127-182345- /O.NEW.KFSD.SV.W.0054.260518T2308Z-260518T2345Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 608 PM CDT Mon May 18 2026 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Southwestern Sioux County in northwestern Iowa... Northwestern Plymouth County in northwestern Iowa... Northwestern Dakota County in northeastern Nebraska... Northeastern Dixon County in northeastern Nebraska... Southeastern Clay County in southeastern South Dakota... Union County in southeastern South Dakota... * Until 645 PM CDT. * At 607 PM CDT, a severe thunderstorm was located over Martinsburg, or near Ponca, moving north at 60 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Trained weather spotters. At 605pm, a trained weather spotter reported quarter size hail in Allen, Nebraska! IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * This severe thunderstorm will be near... Ponca, Newcastle, Martinsburg, and Ponca State Park around 610 PM CDT. Elk Point around 615 PM CDT. Akron around 625 PM CDT. Other locations in the path of this severe thunderstorm include Hawarden and Alcester. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4240 9673 4244 9693 4306 9679 4296 9632 TIME...MOT...LOC 2307Z 200DEG 50KT 4249 9680 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Meyers