A dangerous wave of heat is returning to eastern South Dakota, northwest Iowa, and northeast Nebraska Friday afternoon. From 2 p.m. to 8 p.m., the heat index could reach 108°F in cities like Sioux Falls, Yankton, Storm Lake, and nearby communities. The National Weather Service warns that these conditions can quickly cause heat-related illnesses, especially for those without air conditioning.
Where the Heat Advisory Applies
The alert includes Sioux Center, Cherokee, Le Mars, North Sioux City, and other towns in the region. The advisory follows Thursday’s stretch of triple-digit heat index readings, making it the second day in a row of dangerous heat.
Health Risks and Safety Warnings
Officials urge residents to avoid strenuous outdoor activities during the hottest hours. Drink plenty of water, wear light clothing, and check on elderly neighbors or those with medical conditions. Never leave children or pets in vehicles, as car interiors can become deadly within minutes.
Impact on Roads and Infrastructure
Highways like I-29, I-90, and US-75 and US-20 could see pavement buckling in extreme heat. Power grids in Sioux Falls and the Siouxland area may be strained by heavy air conditioner use. Outdoor workers in counties such as Lyon, Dakota, and Clay should take frequent breaks in shaded or cool areas.
Cooling Centers and Local Resources
Cooling centers are open in Sioux Falls, Yankton, and Storm Lake for anyone who needs relief from the heat. Residents can contact local emergency management offices for exact locations.
Looking Ahead
The most dangerous period for heat-related illness will be between mid-afternoon and early evening Friday. If extreme heat continues into the weekend, more advisories could be issued.
Western Iowa, southeast South Dakota, and parts of northeast Nebraska are facing another day of extreme heat, with heat indexes up to 108°F. Staying hydrated, limiting outdoor exposure, and using cooling centers can help reduce the risk of illness. With infrastructure also under stress, caution is advised for both residents and travelers.
