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Day 1 Fire Weather Outlook  
NWS Storm Prediction Center Norman OK
1129 AM CDT Fri Jul 22 2022

Valid 221700Z - 231200Z

...CRITICAL FIRE WEATHER AREA FOR PARTS OF THE SNAKE RIVER PLAIN...

Critical conditions are still expected across portions of the Snake
River Plain (see previous forecast below for more details). At least
locally Elevated conditions may extend as far east as the northern
High Plains this afternoon in tandem with surface low development as
a mid-level trough traverses the northern Rockies through the
period. The primary factor in withholding fire weather highlights
was the lack of a more widespread 15+ mph sustained wind field.
Deep-layer ascent acco*panying the mid-level trough will also
trigger isolated thunderstorms across the central and northern
Rockies by afternoon peak heating given the presence of adequate
mid-level moisture. Isolated dry thunderstorm highlights have been
added where coverage of fast-moving high-based storms is expected to
be greatest, and where fuels are receptive to fire spread. In
addition, brief but erratic wind gusts may acco*pany the stronger
storms, potentially exacerbating the spread of ongoing fires, or
agitating lightning-induced ignitions. Otherwise, locally Elevated
conditions are still expected this afternoon across portions of the
Great Basin, and within a confined area of southern California
(Tejon Pass into the Tehachapi mountains).

..Squitieri.. 07/22/2022

.PREV DISCUSSION... /ISSUED 0202 AM CDT Fri Jul 22 2022/

...Synopsis...
A midlevel shortwave trough and enhanced west-southwesterly flow
aloft will track eastward across the Northern Great Basin into the
northern Rockies during peak heating, while a secondary shortwave
impulse crosses the Sierra late in the period. 

...Northern Great Basin into the central/northern Rockies...
As the strong/deep west-southwesterly flow overspreads portions of
the Northern Great Basin, deep boundary-layer mixing will result in
single-digit to lower teens RH amid breezy westerly surface winds.
The best overlap of strong winds and low RH is expected along
portions of the Snake River Plain -- where 20-25 mph sustained
westerly surface winds (with higher gusts) will overspread
critically dry fuels. Therefore, Critical highlights have been
maintained over this area. 

Farther west in the lee of the Sierra, dry/breezy conditions will be
possible as modest west-southwesterly flow preceding the second
midlevel impulse crosses the area. However, these conditions appear
too brief/localized for highlights. 

...Parts of Southern California...
Enhanced onshore flow peripheral to the midlevel trough will result
in warming/drying over parts of inland southern California -- where
widespread single-digit to lower teens RH is expected. These dry
conditions, coupled with breezy/terrain-enhanced surface winds, will
support locally enhanced fire-weather conditions along the I-5
corridor. Highlights have been withheld owing to the localized
nature of the fire-weather threat.

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