Southeast Wyoming welcomed warmth in the Cheyenne region as temperatures rose above 40F Sunday. That is due to a frontal boundary that has stalled over Wyoming from the northwest to southeast part of the state. There is a tight pressure gradient east of the quasi-stationary boundary that will produce breezy winds in eastern Wyoming. A couple High Wind Warnings have been issued today west of Cheyenne along I-80. They expire by Monday at 5:00pm. A Winter Storm Watch is issued along the west Wyoming border where snow showers will start Monday and expire by Wednesday at 11:00pm. A Wind Chill Watch that started in northeast Wyoming has now expanded to the eastern third of Wyoming that spans from Wednesday to Friday. Low temperatures combined with the wind are going to harsh from Wednesday to Friday.
A couple High Wind Warnings remain after a wild wintery week of weather. These warnings will expire Sunday morning and temperatures will warm some going into the afternoon. It will still be breezy in localized valleys and the Wyoming eastern interior with gusts in the mid 20 mph range in the morning and afternoon hours. The breeze-swept region will migrate to southeast Wyoming Monday morning gusting past 30 mph to start the week. A week of breezy winds in Wyoming will be upstream of the Wind Chill Watch in northeast Wyoming, across much of South Dakota and north-central Nebraska from Monday to Friday as a tight pressure gradient and a cold air mass settle over the region for several days.
Heavy snow is in the forecast. While most of us enjoyed a warm Sunday, a large winter weather system is engulfing the western United States. Snow showers are currently over the west Wyoming border spilling from north Utah and east Idaho. Monday morning will bring snow north and south of the Wind River Range. It won’t be until Monday evening when a large influx of moisture from northern Colorado and the Central Plains injects additional moisture along the cold front that will have passed most of Wyoming. The moisture from the plains will overrun the frontal boundary and produce large amounts of snow on the west side of the boundary into eastern Wyoming, northwest Nebraska, and southwest South Dakota.
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