CW3E AR Update: 18-23 October 2017 Summary

October 26, 2017

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Two Early Season Atmospheric Rivers Make Landfall over the Pacific Northwest

• The first AR made landfall over WA and OR ~1200 UTC 18 October 2017
• This AR produced >300 mm of precipitation over the Olympic Mountains in 72 hours (R-Cat 2)
• The second AR made landfall over OR ~0600 UTC 21 October 2017
• This AR produced >400 mm of precipitation over the Cascade Mountains in OR in 72 hours (R-Cat 3)

Click IVT or IWV image to see loop of GFS analysis Valid 0000 UTC 18 October – 0000 UTC 24 October 2017

Images from CIMSS/Univ. of Wisconsin

Summary provided by B. Kawzenuk, C. Hecht, and F.M. Ralph; 1 PM PT Thursday 26 October 2017