Fire Weather Outlook Discussion
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FNUS21 KWNS 210748

Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0147 AM CST Tue Nov 21 2017

Valid 211200Z - 221200Z

The mid-level ridge across the western United States will build
northward today. Downstream from the ridge, a series of mid-level
troughs will move across the eastern United States, helping to
produce mean troughing. The result will be a relatively dry airmass
entrenched across most of the United States.

...Southern Plains...
Strong northerly winds in excess of 20 mph, with gusts between 40-50
mph, will develop in the wake of a surface cold front. These winds
will usher in a very dry airmass during the day in the wake of a
surface cold front. Despite cold-air advection, relative humidity
should manage to fall into the 20-30% range across much of the area,
with locally favored areas falling into the teens. The combination
of winds in excess of 20 mph and relative-humidity values in the
20-30% range will result in elevated to locally critical
fire-weather conditions. Peak fire-weather concerns will occur
during the late morning and early afternoon across northern portions
of the outlook area and then shift southward with time as falling
temperatures in the north allows relative humidity to recover

..Southern California...
The overall large-scale pattern will favor weak, easterly, off-shore
flow early on Tuesday. However, the flow looks to remain weak,
precluding the need for fire-weather highlights.

..Marsh.. 11/21/2017

...Please see for graphic product...

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