Winter Finally Heading For Wyoming!

Winter Finally Heading For Wyoming!

A major change in the weather pattern is about to take place.  Riverton WFO has provided a comprehensive discussion of what can be expected this next week.  It appears now that the primary effect will occur initially east of the Continental Divide but all of the Cowboy State will see a major change beginning by Monday.

Old Man Winter arrives late this weekend and he will decide to stay a while this time. After a warm and at times, breezy weekend, expect a sharp change to cold and wintry conditions Sunday night into Monday morning. Widespread accumulating snow, well below normal temperatures, and gusty north wind will accompany an arcitc push east of the Divide on Monday, with a re-enforcing shot of cold air arriving on Tuesday into Wednesday. Temperatures will begin to rebound a bit on Thursday with another system possibly bringing rain and snow showers to the I-80 corridor. A little less impact is expected west of the Divide and across the south as the brunt of the storm remains east; only isolated snow showers and cooler temperatures are expected there. 

Hunters and others who expect to be outdoors late this weekend into Veterans’ Day should prepare for a significant shift to cold, wet, and windy conditions.
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Stay up to date with our current products, and what they mean as they will be updated throughout the weekend: 

NWS Text Products and Forecasts
  Area Forecast Discussion   Winter Watch / Warning   Special Weather Statement    What’s a “Watch?” 
  Watch/Warning Map  Freeze Watch / Warning  Weather Story   Rain and Snow Reports
Storm Timing and Impacts

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Model Depiction of Temperature at 10k feet.
Green and orange shades show more mild air, the white line is the freezing line, and anything in the blue to purple shades is cold…the icy blue to navy blue shades are very cold for this time of year, and the tan shades inside of the navy blue shades show near record breaking cold temperatures!
The loop advances in 6 hour time steps, beginning at 5am Friday morning and ending next Friday afternoon. The time stamp in the bottom right hand corner shows the valid time in “Z Time” (where 00Z = 5pm and 12Z = 5am MST)
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Storm Impacts

The main storm impact is expected to be a result of the very cold temperatures that will be moving in; after such a long and mild fall, this sudden and severe temperature drop will be a shock to the system. Those who plan to be outdoors for Veteran’s Day should plan for very cold temperatures, wet conditions, and gusty winds; especially Hunters.
Roads in the low elevations will be on the warm side at the beginning of the storm, this could limit snow accumulation at first on Monday but it will eventually cool enough to allow some accumulation as well as result in some icy spots, especially Monday Night and Tuesday.
Storm Total Snow Through Monday

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Storm total snow forecast through Monday Afternoon (issued Friday Morning) 

Snow and Wind Forecasts – Update Every 3 Hours

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12 Hour Snow Accumulation Forecast 
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12 Hour Peak Wind Gusts 

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24 Hour Snow Accumulation Forecast
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24 Hour Peak Wind Gusts
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36 Hour Snow Accumulation Forecast
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36 Hour Peak Wind Gusts

Temperature Change Sunday (11/9) Versus Wednesday (11/12)

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Sunday’s High Temperature
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Wednesday’s High Temperature

Also of interest for those who are traveling: there is a tool available on this websitethat gives you the expected weather conditions along your customized route(instructions here). This web page also displays an array of data that comes out of our office in a very attractive and easy to understand format. Give it a try. In addition, you may also want to check out the web cameras along your route using our handy web cam mosaic page.  
Current Conditions – Click Thumbnails To Enlarge

Northern Rockies Radar

Riverton Radar



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Casper Webcam

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Buffalo Webcam

Riverton Webcam

Big Horn Lake Webcam

Brooks Lake Webcam

Lander Webcam

Thermopolis Webcam

Togwotee Pass Webcam

Granite Pass Webcam

Powder River Pass Webcam

South Pass Webcam

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