Scattered showers are moving through far SE South Dakota early this morning but should just bypass Sioux Falls to the south. Storms are likely, though, for Yankton and Vermillion. These are a continuation of overnight action coming out of western Nebraska and the Yankton storms could move close to Sioux Falls. Clouds will remain in place this morning for the Black Hills and far west. They’re trapped by a boundary moving slowly eastwards. Strong NW winds will move in behind this. That will signal a pattern change, bringing hot temperatures and more sunshine for the coming days.
Showers should reform in north-central SD this afternoon and could progress closer to Pierre. These will spread east and intensify. Some storms could turn severe. Storms are more likely late in the evening by Aberdeen and into the overnight by Sioux Falls. A few could remain through the early morning hours of tomorrow.
By tomorrow afternoon, we’re really starting to warm up. Some could be close to or above 90°. The air should feel slightly drier and we’ll get some more sunshine. Expect this pattern to last for the foreseeable future.