The big weather story today will be the heat across KELOLAND. A heat advisory has been posted for much of central and parts of eastern South Dakota. This includes Mobridge, Pierre, Mitchell, Yankton, and Aberdeen. Heat index values will reach 100 or higher this afternoon in these areas. Sioux Falls will be hot as well, with highs in the lower 90s. Rapid City will also be hot in the upper 90s, but dewpoints are expected to be lower. Isolated thunderstorms could develop late this afternoon in the Black Hills region. We will keep an eye on that for any isolated severe weather potential. Otherwise, the forecast overnight includes a slight chance of isolated rain affecting Pierre and the Missouri River Valley. Most areas will be dry, but a cold front will move in from North Dakota late tonight affecting Aberdeen and Watertown.
This cold front could be associated with a few isolated pockets of rain tomorrow, perhaps a bit more south of I-90 by late morning. The main effect from this cold front will be slightly cooler weather on Saturday. Highs will range from the mid to upper 80s in both Aberdeen and Sioux Falls, to around 93 in Pierre. The best chance of scattered thunderstorms will be West River tomorrow.
Sunday's forecast looks warm with slight chance of rain in both Aberdeen and Rapid City. As we turn the page to next week, Monday's forecast looks hotter again in southern KELOLAND with highs returning to the low 90s in Sioux Falls. We’ll have a chance of rain again on Tuesday into early Wednesday as a push of cooler air tries to head south. We might get close to “normal” highs again by midweek, but there are signs of another warming trend toward the end of next week too. Stay cool.