BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Sioux Falls SD 709 PM CDT Thu Aug 20 2026 The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Northeastern Minnehaha County in southeastern South Dakota... * Until 730 PM CDT. * At 709 PM CDT, a severe thunderstorm was located near Lyons, or 13 miles north of Sioux Falls, moving east at 40 mph. HAZARD...Golf ball size hail and 60 mph wind gusts. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect hail damage to roofs, siding, windows, and vehicles. Expect wind damage to roofs, siding, and trees. * This severe thunderstorm will be near... Baltic and Dell Rapids around 715 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. To report severe weather, contact your nearest law enforcement agency. They will send your report to the National Weather Service office in Sioux Falls. && LAT...LON 4377 9645 4364 9653 4374 9695 4385 9688 4385 9685 TIME...MOT...LOC 0009Z 287DEG 33KT 4374 9680 THUNDERSTORM DAMAGE THREAT...CONSIDERABLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH
