Fire Weather Outlook Discussion
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FNUS21 KWNS 181550
FWDDY1

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0949 AM CST Mon Dec 18 2017

Valid 181700Z - 191200Z

The ongoing forecast is on track, with a few areas of gusty winds
remaining likely within the elevated area through at least 18Z/10am
PST.  See the previous discussion below for more details.

..Cook.. 12/18/2017

.PREV DISCUSSION... /ISSUED 1216 AM CST Mon Dec 18 2017/

...Synopsis...
An upper trough over northern Mexico will slowly shift east toward
the southern Rockies and Rio Grande Valley. In the wake of the
trough, a broad upper ridge will overspread the Pacific coast.
Deep-layer northerly flow will remain over CA but will diminish
greatly by midday. At the surface, high pressure over the Great
Basin will weaken, resulting weakening of offshore winds across
southern CA by late morning.

...Portions of Southern CA...

Gusty winds may continue for a few hours this morning before the
surface pressure gradient weakens considerably after about 15-18z.
However, RH values will start the day higher than in previous days,
in the 25-45 percent range. Elevated fire weather conditions are
possible during the morning until gusty winds diminish, especially
near ongoing fires. By afternoon, RH values will fall into the 15-25
percent range, except near the coast and valley locations where
values will remain higher. However, wind speeds will be much lighter
during the afternoon. Overnight, RH values will again see good
recovery and winds will remain light.

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

$$


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