Possible Winter Event Late This Week - Updated Monday Evening

The National Weather Service
Building a Weather-Ready Nation

Summary | Forecast | Monitoring & Reporting Snowfall | Safety

One of the first major winter weather events may be in development for later this week. Models have been indicating a strong potential for a wave of low pressure to swing through the state Thursday through Sunday, bringing potentially widespread winter weather. Models have indicated the potential for significant snowfall across the mountain areas through the event, with much colder temperatures bringing snowfall across many basins and valleys. Because this storm is far enough in the future, this news story will be updated frequently. Now is the time to make sure you and your family are ready for Wyoming winter. The information below will be updated semi-frequently, please keep an eye on this page as the system gets closer.

Models continue to indicate a ridge of high pressure early in the forecast period. This first system will leave relatively dry and mild condtions across the area through the middle portion of the week. Some instances of light shower activity will be possible across the northwestern mountains as disturbances move along the ridge.

The big story will then begin to develop Thursday evening as an area of low pressure moves over the Pacific Northwest. This system will create a southwest flow over the area, with moisture moving across the western mountains and valleys by late Thursday and into Friday. As this system moves further inland, it will dig deeper south, though the center of the low pressure is generally expected to stay north of Wyoming. The associated wave of low pressure will usher in much cooler temperatures, and an active winter weather pattern for the end of the week and into the weekend. The loop below demonstrates the progression of weather systems according the most recent model solutions. Below the loop are images of forecasted maximum temperatures for Wednesday and Saturday to show the possible temperature change.

Forecast Loop
ECMWF Model Solution through the afternoon of 11/12/2012
Forecast Temps Nov 7th Forecast Temps Nov 10th
Forecast Max Temperatures for Wednesday 11/7/2012 Forecast Max Temperatures for Saturday 11/10/2012


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