BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 643 PM CDT Thu Aug 20 2026 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Southern Minnehaha County in southeastern South Dakota... East central McCook County in southeastern South Dakota... * Until 730 PM CDT. * At 643 PM CDT, a severe thunderstorm was located near Humboldt, or 7 miles northeast of Lake Vermillion State Recreation Area, moving east at 35 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. * This severe thunderstorm will be near... Hartford and Humboldt around 650 PM CDT. Sioux Falls, Crooks, Wall Lake, and Ellis around 655 PM CDT. Renner around 700 PM CDT. Other locations in the path of this severe thunderstorm include Brandon and Corson. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4365 9653 4350 9664 4350 9692 4365 9724 4378 9716 TIME...MOT...LOC 2343Z 292DEG 31KT 4369 9709 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH
