CW3E AR Update: 11 April 2017 Outlook

April 11, 2017

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AR Currently Impacting West Coast

An AR is currently impacting Northern CA producing widespread precipitation over the region
A second AR is forecast to merge with the current AR, prolonging AR conditions over Northern CA
.25 to .88 inches of precipitation has already fallen across portions of Northern CA with >2.5 inches forecasted for higher elevations
This event could produce enough precipitation to make water year 2017 the wettest year recorded by the Northern Sierra 8-station index

SSMI Integrated Water Vapor (IWV)

Valid 10-11 April 2017

Click IVT or IWV image to see loop of 0-51 hour GFS forecast Valid 1200 UTC 11 April – 1500 UTC 11 April 2017 A second AR with a separate parent low-pressure system is forecast to merge with the current AR, which could prolong AR conditions over portions of Northern CA

Summary provided by C. Hecht and F.M. Ralph; 1 PM PT Tuesday 11 April 2017

Entry posted in: Atmospheric Rivers, CW3E AR Updates, Extreme Events, FIRO
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