“Early Significant Snow and Wind east of the Divide and the South,” warns the National Weather Service. “Unseasonably strong.”
Power outages possible. Mountain recreation could be life threatening. Wind chills into the single digits (-12.7C or even lower).

National Weather Service Riverton, Wyoming – 7 Sep 2020

An unseasonably strong storm system for September will impact the Cowboy State Monday afternoon through Tuesday. The associated cold front will push into northern Wyoming Monday morning, and sweep southward to the Continental Divide by mid- afternoon. This front will then sweep across the rest of the area between 9 PM and midnight. Precipitation will begin over the north Monday afternoon spreading south into central Wyoming Monday evening.

In lower elevations the precipitation is expected to begin as rain before changing to snow some time in the evening pretty rapidly depending upon elevation. Significant snowfall is expected for mountains east of the Divide and central Wyoming.

WINTER STORM WARNING from 6 PM this evening to 9 AM Tuesday

Heavy snow expected. Total snow accumulations of 10 to 20 inches. Winds gusting as high as 55 mph.

* WHERE…Owl Creek and Bridger Mountains.

* IMPACTS…Travel may become difficult due to slick and slushy roads and low visibility in falling snow. Damage may occur to trees and power lines, possibly leading to power outages.
Mountain recreation could be life threatening to those caught unprepared for severe winter conditions.

* ADDITIONAL DETAILS…Wind chills will be as low as the single digits. Overnight low temperatures Tuesday night in the Colorado mountains will drop into the low 10s.
https://forecast.weather.gov/wwamap/wwatxtget.php?cwa=cys&wwa=winter%20storm%20warning

Thanks to Kenneth Lund for this link

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September 7, 2020 at 10:36AM