Fire Weather Outlook Discussion
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FNUS21 KWNS 230649

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0148 AM CDT Sat Sep 23 2017

Valid 231200Z - 241200Z

A large-scale upper trough/low centered over the Great Basin will
continue to move slowly eastward across the western CONUS today. An
upper ridge will persist over much of the eastern CONUS. While
enhanced mid-level southwesterly winds will remain present over
portions of the Southwest into the High Plains this afternoon, RH
values behind a surface cold front are generally expected to remain
above critical levels across these areas.

...Portions of the Sacramento Valley and Adjacent Coastal Ranges of
Northern CA...
On the back side of the upper trough/low described above, enhanced
northerly winds will persist over much of CA today. As diurnal
mixing of the boundary layer occurs, some increase in low-level
winds appears likely across parts of the Sacramento Valley and
adjacent Coastal Ranges of northern CA. Consensus of recent
short-term guidance indicates sustained northerly winds around 15
mph should occur in conjunction with RH values becoming lowered
generally into the 15-20% range for a few hours this afternoon. Fuel
guidance suggests most fuels remain receptive to large fire starts,
and therefore a small elevated area has been introduced across this

...Portions of the Southwest...
Locally elevated fire weather conditions may briefly occur across
parts of northern AZ and southeastern UT this afternoon where RH
values will become lowered to around 15-20% in conjunction with
strong/gusty surface winds of 15-25 mph. However, only marginally
receptive to unreceptive fuels across this region and cooler
temperatures behind the surface cold front preclude the introduction
of an elevated area.

..Gleason.. 09/23/2017

...Please see for graphic product...

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