CW3E Event Summary: 21-23 February 2020

February 25, 2020

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Cutoff low and landfalling AR bring heavy rainfall and mountain snowfall to southwestern U.S.

  • Southern Arizona experienced weak-to-moderate AR conditions for more than 24 hours [AR1/AR2 based on the Ralph et al. (2019) AR Scale]
  • Some locations in central AZ received more than 2 inches of total precipitation from this event
  • Significant snowfall (> 8 inches) also occurred over the higher terrain in south-central UT and central CO

MIMIC-TPW2 Total Precipitable Water

Valid 1200 UTC 20 February – 1200 UTC 23 February

Images from CIMSS/Univ. of Wisconsin

GOES-West GeoColor

Valid 2201 UTC 21 February – 0001 UTC 22 February










Summary provided by C. Castellano, C. Hecht, B. Kawzenuk, N. Oakley, and F. M. Ralph; 25 February 2020