Iowa Severe Thunderstorm Warning | Effective 05/17/2026 17:20

Headline: 
Severe Thunderstorm Warning issued May 17 at 7:20PM CDT until May 17 at 8:00PM CDT by NWS Sioux Falls SD
Event: 
Severe Thunderstorm Warning
Urgency: 
Immediate
Effective: 
May 17, 2026 - 5:20pm
Expires: 
May 17, 2026 - 6:00pm
Description: 
SVRFSD The National Weather Service in Sioux Falls has issued a * Severe Thunderstorm Warning for... Southeastern Sioux County in northwestern Iowa... Northeastern Plymouth County in northwestern Iowa... * Until 800 PM CDT. * At 719 PM CDT, a severe thunderstorm was located near Alton, or near Orange City, moving northeast at 20 mph. HAZARD...Ping pong 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... Orange City, Alton, and Granville around 725 PM CDT. Hospers around 735 PM CDT.
Instruction: 
Prepare immediately for large hail and deadly cloud to ground lightning. Seek shelter inside a well-built structure. Stay away from windows. A Tornado Watch remains in effect until 1000 PM CDT for northwestern Iowa.
Area Description: 
Plymouth, IA; Sioux, IA
Forcast Office: 
NWS Sioux Falls SD
Sender: 
w-nws.webmaster@noaa.gov