Another storm system will drop southeast into Idaho on Monday. This will enhance snowfall in the western mountains and valleys by early Monday with the snow prevailing through the day. Snowfall totals in the west will generally range from three to five inches in the valleys and five to ten inches in the mountains. As the storm drops farther south it will drag a cold front south out of Montana and through areas east of the Continental Divide. The front will begin pushing into the northern Big Horn Basin by late Monday afternoon and reach Casper, Lander, and Riverton by mid-evening Monday. By sunrise Tuesday, the front will have pushed through Sweetwater County to the Colorado border.
Widespread light snow is expected to develop behind this front and continue through Tuesday morning. Many lower elevation locations east of the Continental Divide will see snowfall of two to three inches. North wind of 15 to 25 mph will be common. The combination of snow and wind will make for hazardous driving conditions Monday evening. Road surfaces for the Tuesday morning commute will remain icy and snowpacked as much colder temperatures envelop the region. High temperatures will generally be in the single digits and teens for Tuesday and Wednesday, some 20 degrees colder than Monday. The coldest morning of the week will be Wednesday with readings bottoming out between 10 below and 20 below zero.
Stay tuned to the NWS Riverton website and All Hazards NOAA Weather Radio for more information about this incoming system. Be sure to check the latest road conditions courtesy of the Wyoming Department of Transportation via the internet (map or text) or by calling 511.