Severe Thunderstorm Warning

Locations Affected

Crows Nest Peak, SD ∙ Medicine Mountain, SD ∙ Bear Mountain, SD ∙ Flag Mountain, SD ∙ Nipple Butte, SD

Full Alert Message

BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Rapid City SD 506 PM MDT Tue Aug 11 2026 The National Weather Service in Rapid City has issued a * Severe Thunderstorm Warning for... Northwestern Custer County in southwestern South Dakota... West Central Pennington County in west central South Dakota... * Until 600 PM MDT. * At 506 PM MDT, a severe thunderstorm was located near Deerfield, or 18 miles northwest of Hill City, moving southeast at 20 mph. HAZARD...Ping pong ball size hail. SOURCE...Radar indicated. IMPACT...People and animals outdoors will be injured. Expect damage to roofs, siding, windows, and vehicles. * Locations impacted include... Deerfield, Flag Mountain, Deerfield Reservoir, Bear Mountain Lookout, Medicine Mountain and Redbank Spring Campground. PRECAUTIONARY/PREPAREDNESS ACTIONS... Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing large hail. && LAT...LON 4406 10403 4413 10386 4392 10357 4375 10387 TIME...MOT...LOC 2306Z 326DEG 16KT 4404 10390 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.50 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH

---