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FNUS28 KWNS 252034
FWDD38

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0334 PM CDT Mon Sep 25 2017

Valid 271200Z - 031200Z

The upper trough/low centered over the lower Colorado Valley at the
beginning of the Day 3-8 period will slowly migrate northward toward
the Rockies through the weekend. Another upper trough will move
onshore the Pacific Northwest by the end of this week and overspread
much of the Intermountain West region through early next week. The
main fire weather concern during the period will remain over
portions of southern California with hot and dry conditions
persisting in the presence of weak offshore flow through the
weekend.

...Day 3/Wed -- Portions of Southern California Coastal Ranges and
Foothills...

Elevated fire weather conditions will persist into Wednesday across
portions of southern California. Deep layer northerly flow will
likely be strongest during the morning before the upper low begins
to pull away from the region. However, the surface pressure gradient
will remain on the weak side, limiting stronger offshore winds from
developing. Wind speeds around 15-25 mph with gusts to 40 mph will
be possible during the morning in typical wind prone areas with
lighter winds elsewhere. By afternoon, wind speeds should begin to
diminish. High temperatures will again be in the 80s and 90s with RH
values dropping into the 10-15 percent range. This could again
result in some localized brief critical conditions.

Weak offshore winds will continue into the weekend, though speeds
will be much lighter compared to the Day 1-3 period. However,
temperatures will climb even higher, with some valley locations
reaching triple digits and RH values perhaps falling into the single
digits. A lack of stronger winds will preclude introduction of any
fire weather areas at this time however.

..Leitman.. 09/25/2017

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

$$


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