Meteorological and Hydrometeorological Conditions Associated with the Historic Winter 2017 Heavy Rainfall and Flooding Events in the San Francisco Bay Region
Warren Blier, DOC/NOAA/NWS San Francisco Bay Area, Monterey, CA
Mark Strudley, DOC/NOAA/NWS San Francisco Bay Area
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Abstract
Meteorological and Hydrometeorological Conditions Associated with the Historic Winter 2017 Heavy Rainfall and Flooding Events in the San Francisco Bay Region

Warren Blier and Mark Strudley

NOAA/NWS WFO San Francisco Bay Region/Monterey

During the period 3 January to 21 February 2017, a series of strong Atmospheric River events brought record and near-record rainfall amounts to the greater San Francisco Bay Region.  The California Department of Water Resources rain gauge at Venado, in the coastal mountains 67 miles (108 km) north-northwest of San Francisco, recorded 84 inches of rain in this less than 2-month interval.  Widespread flooding resulted, including historic flooding in the City of San Jose that led to the evacuation of 50,000 residents and damage estimates in excess of $70 Million.

This presentation will examine the meteorological and hydrometeorological conditions that resulted in this historic heavy rainfall and flooding.  With this occurring under ENSO-neutral conditions, the associated synoptic-scale evolution will be compared with that of the similarly anomalously wet 1982-83 and 1997-98 El Nino winters.  In addition, the complex interplay of rainfall and flood infrastructure will be considered.