Scattered thunderstorms have developed this morning in eastern KELOLAND, some with large hail. We’ll continue to track the storms, but a decrease in the activity is expected by mid to late morning. Highs will be warm in the mid to upper80s with southeast winds.
New storms are likely by late afternoon and early evening between the Missouri and James River Valleys. The Storm Prediction Center has issued a slight risk of severe weather for much of eastern KELOLAND, including Sioux Falls. We expect clusters of strong to severe storms to track east along and ahead of a low pressure system and associated warm front. All modes of severe weather will be possible initially, with very large hail to the size of baseballs and isolated tornadoes possible. The storms will become more likely toward I-29 by mid to late evening. Heavy rain and severe weather threats will continue after sunset, so stay alert to the latest forecast.
Most of the rain will clear the region by early morning. Look for another muggy day tomorrow with highs in the mid to upper 80s. The heat index will be in the 90s in many spots. Friday looks hot and humid too, with highs once again in the 80s and plenty of humidity.
While some scattered rain can’t be ruled out Thursday night or Friday AM, the best chance of new storms will be Friday night and Saturday. Some severe weather will be possible again and locally heavy rain is expected. Chances of rain will linger into Sunday as well as we watch a cold front moving slowly through the region.
Cooler weather is expected early next week, but more rain is likely by Tuesday and Wednesday.