A hot and humid weekend lies ahead for much of southeastern South Dakota, with some heat indices forecast to reach triple digits, according to the National Weather Service in Sioux Falls.

The heat could be lessened by cloud cover on Aug. 15, making Aug. 16 likely to be the hotter day, with the warmest conditions expected south of Interstate 90, the weather service said. In Yankton, near the Nebraska border, the heat index was predicted to reach 105 degrees on Aug. 15 and 106 degrees on Aug. 16.

There's also a possibility of isolated strong to severe thunderstorms the night of Aug. 15, with 60 mph winds and half-dollar-sized hail being the main threats. The main round of storms is expected to develop over western South Dakota and move east, reaching the eastern part of the state overnig

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