National Weather Service United States Department of Commerce

Today will be hot with temperatures rising into the 90s to 102 degrees. The hot and humid conditions will result in heat index values of 98 to 102 degrees over much of central South Dakota this afternoon, where a Heat Advisory is in effect. Stay safe this afternoon by taking frequent breaks from the summer heat, drinking plenty of water, and watching for signs of heat illness. There is also a Marginal Risk (level 1 out of 5) of severe weather late this evening into the overnight hours across portions of north central South Dakota (mainly Corson and Dewey Counties). Looking ahead to Thursday, highs will be in the 80s under a cloudy sky with showers and thunderstorm. There is a Marginal Risk (level 1 out of 5) of severe weather Thursday afternoon and evening.
There is also a Marginal Risk (level 1 out of 5) of severe weather late this evening into the overnight hours across portions of north central South Dakota. This includes Corson and Dewey Counties. A couple of storms could become strong to severe, with damaging winds to 60 mph being the main concern. Hail of 1" in diameter (quarter size) is also possible, mainly west of Corson and Dewey Counties. Those with outdoor plans are asked to remain weather aware late this evening into the overnight hours, and seek an indoor shelter if storms near.
Expect a change in our hot and humid weather on Thursday, with highs only in the 80s. Thursday will feature off and on showers under a cloudy sky. Isolated severe storms will be possible, mainly during the afternoon and evening hours, with a Marginal Risk of severe storms (level 1 out of 5). Damaging winds will be the main concern with the strongest storms.
The Air Quality Index (AQI) ranges from Good to Hazardous. Now is the time to monitor the air quality, and alter outdoor plans when unhealthy to hazardous air quality is occurring.