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Heavy Rainfall in Southern California and in the Southern Plains; Heavy Snow in the Sierra Nevada Mountains and Rockies

A Pacific storm will bring coastal/lower elevation heavy to excessive rainfall to southern California and the Southern Rockies today, with localized flash flooding possible, especially near recent burn scars. Heavy snow is forecast over parts of the Sierra Nevada Mountains today and over the Northern Rockies on Wednesday. Several inches of snowfall accumulation is possible. Read More >

  Overview

December 21, 2017  A strong cold front pushed south across Wyoming Wednesday afternoon and evening.  Strong north winds accompanied the front with the Buffalo Airport recording a peak wind gust of 54 mph Wednesday evening. The heaviest snow fell across the WInd River Basin and in the Casper area Wednesday night, with over 8 inches of snow measured in Lander, and nearly 7 inches of snow reported at the Natrona International Airport in Casper.  

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Map of Storm Total Snowfall for December 20-21, 2017 (click to enlarge)
Snow and blowing snow at the Riverton National Weather
Service Office around 9 pm Wednesday
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