Sioux Falls, South Dakota – Intense heat is surging back into eastern South Dakota, northwest Iowa, and northeast Nebraska, pushing heat index values up to 108 degrees from 2 p.m. to 8 p.m. Friday. Residents in Sioux Falls, Yankton, Storm Lake, and surrounding communities face another round of dangerous heat, increasing the risk for heat-related illnesses and straining local infrastructure.
According to the National Weather Service in Sioux Falls, the new Heat Advisory follows a string of 100-plus degree heat index readings Thursday. The alert includes cities such as Sioux Center, Cherokee, Le Mars, and North Sioux City. Health officials urge people to avoid strenuous outdoor activity, check on neighbors, and stay hydrated. Car interiors can reach deadly temperatures within minutes, making it crucial not to leave children or pets unattended.
Roadways like I-29, I-90, and Highways 75 and 20 may see increased pavement buckling and breakdowns as the extreme temperatures continue. Power grids in Sioux Falls and the Siouxland area could be stressed by peak air conditioner use. Those working outdoors in places like Lyon County, Dakota County, or Clay County should take frequent breaks in shaded or air-conditioned spaces.
The highest danger window runs from mid-afternoon through early evening Friday. Cooling centers remain open in Sioux Falls, Yankton, and Storm Lake. More advisories are possible if the heat wave lingers.
