National Weather Service United States Department of Commerce

Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

This evening there is the potential for storms to develop in western ND move into central SD then northeastern SD. There is a slight risk (level 2 out of 5) into a marginal risk (level 1 out of 5) for these storms to be severe, with the main threat of wind gusts of 60 mph and an additional threat of hail up to an inch in diameter.
There is a marginal risk (level 1 out of 5) for severe storms to occur Sunday from the late afternoon into the overnight hours mainly over northeastern SD. The main threats are hail up to an inch in diameter and wind gusts of 60 mph.
A heat advisory will be in effect from 1 PM to 8 PM CDT Sunday afternoon. Heat index values will peak between 95°-103° Sunday afternoon. This level of heat will impact those sensitive to heat and those without effective cooling or adequate hydration. For tips on how to stay safe during excessive heat, visit: weather.gov/safety/heat