Fire Weather Outlook Discussion
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743
FNUS21 KWNS 150703
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0102 AM CST Fri Dec 15 2017

Valid 151200Z - 161200Z

...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF SOUTHERN CALIFORNIA...

...Synopsis...
...Portions of Central CA...

An upper ridge over the western U.S. will break down this period as
a shortwave trough moves over the Pacific Northwest. Overnight this
trough will dig southward, becoming oriented from southwest MT to
southern CA by Saturday morning. Strong deep-layer northerly flow on
the back side of the trough will overspread the Pacific Northwest
and much of California. Elevated to locally critical conditions are
expected to develop over the mountains and foothills in the vicinity
of the Bay Area along the central CA coast and adjacent portions of
the Sacramento Valley late in the period. In higher elevations, RH
values will begin to fall into the 20-35 percent range early
Saturday morning as sustained north winds increase to 15-25 mph with
higher gusts.

...Portions of Southern CA...

High pressure over the Great Basin this morning will weaken later
today as the upper ridge breaks down ahead of the shortwave trough
moving into the Pacific Northwest. Gusty offshore winds will
continue across the southern CA mountains and foothills this morning
and several hours of critical conditions are expected. While wind
speeds are then expected to weaken during the afternoon and evening,
conditions will remain very dry and elevated fire weather conditions
will continue for much of the period, especially in higher
elevations where overnight RH recovery will be poor.

..Leitman.. 12/15/2017

...Please see www.spc.noaa.gov/fire for graphic product...

$$



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