National Weather Service United States Department of Commerce

South to southeast winds increase today along and west of the Missouri River with gusts of 30 to 40 mph, highest north of Eagle Butte. Combined with humidity between 20 and 25 percent by afternoon, grassland fire danger will be high to very high.
Winds shift to the west to northwest Thursday afternoon and increase with gusts 35 to 50 mph. On Thursday, winds will be strongest across north central SD, but the gusty winds spread east on Friday. As humidity falls to 15 to 25 percent each day, fire conditions will become critical. Blowing dust may also be an issue each day with the strongest winds.