As southeast Wyoming braces for exceptionally cold weather and wind chills that could reach -70, the Cheyenne Office of the National Weather Service is offering updated information on the threat posed by the arctic blast of cold air.

The agency posted this on its website:

The added the following information in an email:

Good morning,The weather Impact Level for extreme, life-threatening cold temperatures and wind chills Today through Friday, and for local snow squall impacts this morning - evening is: High 

NWS Cheyenne will conduct another Webinar Briefing today, Wednesday, Dec. 21st, at 10am MST. Please use the link below to register/join.


Registration link:


Key Messages:

  • Confidence remains high on extreme cold starting mid-day today north, worsening through the evening and especially Thursday southward. Temperatures will fall significantly behind cold front today. Low temperatures Thursday will drop to -20F to -30F. Highs Thursday will be -5F to -15F. Friday High temperatures should reach zero and above most locations but wind chills will remain dangerously cold.


  • Wind chills will drop as low as -40F to -75F with sustained winds of 25 to 35 mph during this time frame. Wind gusts could be as high as 45-75 mph this afternoon, and 45-50mph tonight to late Thursday.


  • Localized moderate to heavy banded snow will occur along and just behind the cold front. Local snow squalls are expected late this morning through this evening - ending north to south.


  • Cold will ease Saturday (Christmas Eve) into Sunday (Christmas) with Highs back in the +30s to +40s.

Recent Updates:
  • Winter Weather Advisories were expanded to account for localized snow squall impacts today. Travel could be locally impacted.

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