Another mild day is forecast Monday, but big changes are on the way Tuesday.
Our weather headlines include a new winter storm warning for the northern Black Hills starting Monday evening and extending into Tuesday. This warning includes Lead, Deadwood, and Hill City. Locally 6+" of snow will be possible in this areas.
A new winter storm watch has been posted for parts of eastern KELOLAND, including Milbank, Watertown, Brookings, and Marshall. The watch does not include Sioux Falls at this time. An accumulation of 3-7" looks likely tomorrow in the watch area, so stay tuned for updates through the day.
Rain will develop initially with this system Monday evening from west to east, with strong winds developing on the back side of the low pressure center. As the rain changes to snow, the heaviest accumulations will be east of the James Valley and mainly north of Sioux Falls. We are still watching how far south this system will develop and there are some indicators producing accumulating snow all the way into northeastern Nebraska.
Temperatures will be coldest tomorrow with highs in the 30s and blustery winds. Highs should rebound late Wednesday into Thursday, helping to melt the expected snowfall.