National Weather Service United States Department of Commerce

Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

Ice/freezing rain with accumulations approaching a tenth of an inch Wednesday night through Thursday over northwestern South Dakota.
Probability of Precipitation (%) for selected locations in western South Dakota and northeastern Wyoming from Wednesday through Sunday.
Timeline chart showing expected precipitation types for selected cities in South Dakota and nearby areas from Tuesday to Friday morning.