Dissertation/Thesis Abstract

The Diablo Winds of Northern California: Climatology and Numerical Simulations
by Bowers, Carrie, M.S., San Jose State University, 2018, 65; 13424229
Abstract (Summary)

Extreme fire behavior in the San Francisco Bay Area (SFBA) has historically been associated with strong offshore wind events referred to locally as Diablo winds. A 17 year surface-based climatological analysis was performed to establish a definition of Diablo winds and to identify their frequency and spatial distribution. Synoptic composites of events were constructed using North American Regional Reanalysis, and high resolution Weather Research and Forecasting (WRF) model simulations were used to investigate the mesoscale dynamics of three significant Diablo wind events. Diablo winds were defined as dry northeasterly, downslope winds that occur in the SFBA with minimum sustained wind speeds of 6 m s –1. Climatological analysis results illustrate that Diablo winds most frequently impact the Coast Ranges nearest the Sacramento Valley and occur, on average, 2.5 times annually. The highest monthly frequency occurs in October when live fuel moisture is at its driest, creating the most severe fire danger for the SFBA during that time. Numerical simulations of significant Diablo events revealed that Diablo winds have complex character with contributions from small-scale downslope winds, as well as large-scale mountain waves interacting with terrain.

Indexing (document details)
Advisor: Clements, Craig C.
Commitee: Chiao, Sen, Kochanski, Adam, Lareau, Neil
School: San Jose State University
Department: Meteorology
School Location: United States -- California
Source: MAI 58/04M(E), Masters Abstracts International
Subjects: Meteorology
Keywords: Diablo winds, Downslope winds, Fire weather, Foehn winds, Oakland Hills Fire, Tubbs Fire
Publication Number: 13424229
ISBN: 978-0-438-88995-8
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