A cold front is right in the middle of its passage through KELOLAND. Rapid City is quite cool, and Sioux Falls is almost 25° warmer than its neighbors in the west. There is plenty of breeze to go along with it, with gusts from the south near 30 mph in eastern South Dakota. We’ve had limited rain action, though, with very isolated showers in the northern 1/3 of South Dakota.
These thin bands of showers are just the first wave of a larger system coming out of Colorado. This will QUICKLY make its way into SW South Dakota later this evening. Rain is very likely tonight and tomorrow in both Rapid City and Pierre. There’s the potential for heavier moisture arriving, especially for the southern Black Hills. That will amplify flooding concerns in the west because the rain will melt off much the snow in an instant. The Flood Watch sticks around in the west, and for now goes through Saturday. This is a broad system but has a track farther to the west than last week’s record storm.
The center of the storm will speedily move NNE towards Mobridge by tomorrow. Also like the last storm, dry air cuts up in SE South Dakota. Sioux Falls has less overall chance of rain than the other cities, both tonight and tomorrow. Still, we’re expecting scattered showers East River tonight and tomorrow. Friday will also be cooler across the board, with strong winds taking over. We have Rapid City’s wind forecast at 30-60 mph and Pierre is right there, too. Sioux Falls and Aberdeen are facing a south wind, which will be very breezy, just not quite as windy.
The weekend is shaping up to have partly cloudy skies and cooler temperatures. Patchy frost is possible for many this weekend. There’s also another storm worth watching for next Monday and Tuesday. Wintry mix is possible in both Aberdeen and Rapid City. Early moisture outlooks show another round of heavy moisture is likely. Sunshine returns by Wednesday.