Sioux Falls, SD – The National Weather Service (NWS) has issued a Heat Advisory for parts of western Iowa and southeast South Dakota, warning residents of heat index values climbing to 108 degrees through 8 p.m. Friday. Officials say the sweltering conditions follow a week of oppressive heat that saw similar readings Thursday, prompting health and safety warnings across the region.
Areas Under Advisory and Safety Concerns
The advisory includes communities such as Sioux Center, Cherokee, Le Mars, and North Sioux City, where the heat index is expected to remain dangerously high. According to the National Weather Service in Sioux Falls, prolonged exposure can cause heat exhaustion or heat stroke, and residents should avoid strenuous outdoor activities, check on elderly neighbors, and ensure pets have access to water and shade.
Officials also warn that vehicle interiors can become deadly within minutes, urging drivers never to leave children or animals unattended.
Impact on Infrastructure and Power Usage
Transportation authorities have cautioned that roadways like I-29, I-90, and Highways 75 and 20 could experience pavement buckling due to the extreme heat. Mechanics report an uptick in roadside breakdowns as engines overheat in the blazing conditions.
Meanwhile, energy providers in Sioux Falls and the broader Siouxland area are monitoring power grid loads as air conditioner use surges during peak afternoon hours.
Risks for Outdoor Workers
Those laboring outside in Lyon County, Dakota County, and Clay County are at heightened risk. Authorities recommend frequent breaks in shaded or air-conditioned spaces, wearing light-colored clothing, and drinking water regularly to prevent dehydration.
Construction crews, agricultural workers, and delivery personnel are among those most vulnerable during this heat wave.
Timing and Cooling Centers
Meteorologists say the most dangerous period will occur from mid-afternoon through early evening Friday. If high temperatures persist, the advisory could be extended into the weekend.
Cooling centers are open in Sioux Falls, Yankton, and Storm Lake, offering air-conditioned relief for anyone in need. Residents are urged to monitor local weather updates for the latest advisories.
How are you staying cool during this extreme heat? Share your tips in the comment.
