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FNUS28 KWNS 222111

Day 3-8 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0410 PM CDT Fri Sep 22 2017

Valid 241200Z - 301200Z

An upper-level trough will linger over the western U.S. through
early next week before shifting eastward and deepening over the
eastern states. Medium range guidance is now forecasting a cut-off
low developing over the southwestern desert region.  This low will
be maintained within larger-scale upper ridge building across the
west by the end of next week. At the surface, high pressure will
build over the Pacific Northwest and Great Basin through at least
Day 6/Wed, leading to a favorable pressure gradient for
northeasterly offshore winds to develop across much of CA.

...Days 3-6/Sun-Wed -- California...

An extended period of warm and dry conditions with occasionally
breezy northeast surface winds is expected this weekend into at
least mid-week next week. Current medium-range guidance suggests the
surface pressure gradient will remain modest, and deep-layer
north/northeasterly flow rather light for much of the period. As a
result, wind speeds are expected to remain below critical thresholds
for now. By Day 5/6 - Tue/Wed, a weak upper low over the Great
Basin/lower Colorado Valley may lend support for relatively stronger
winds, but confidence in this scenario is low at this time.

In addition to periods of gusty winds, high temperatures will climb
into the 80s to near 90 degrees each afternoon and RH values will
fall into the 10-15 percent range. The prolonged period of these
warm and dry conditions will result in drying fuel conditions and at
least elevated fire weather conditions are expected.

..Leitman.. 09/22/2017

...Please see for graphic product...

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