Storms will continue to track in from Wyoming and Montana this evening but not everyone will see rains tonight. Some of the storms this evening could be severe, mainly for hail and winds and mainly West River. Our most accurate computer models have pulled these storms into more of a line this evening and there is a Severe Thunderstorm Watch for our NW through 9:00 p.m. MDT. These storms will push to the east during the evening hours but it does look like they will fall apart before reaching Sioux Falls. Still, the SE could catch just a little bit of rain. We'll likely drop our rain chances for Aberdeen and Pierre, too. Tomorrow, another wave comes in with twin fronts. If cloud cover is thick in the southeast, the severe threat will be lower. That would keep more intense heat out of Sioux Falls. But with the heat strong-to-severe storms could form late tomorrow afternoon. Slightly better chances are in the northeast parts of South Dakota.
By Saturday and Sunday much cooler air arrives. These will be more average-type highs, with some spots not even hitting 80. There will be plentiful sunshine over the mainly dry weekend.
By Monday, more heat arrives as West River climbs back above 90. We carry a slight chance of rain on Tuesday.