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Day 2 Fire Weather Outlook  
NWS Storm Prediction Center Norman OK
0138 PM CST Thu Jan 09 2025

Valid 101200Z - 111200Z

...CRITICAL FIRE WEATHER AREA FOR PARTS OF THE FAR SOUTHERN
CALIFORNIA COASTAL TERRAIN...

A Critical risk area has been introduced for portions of Riverside
and San Diego counties in far southern California. An overall
weakening of the offshore wind gradient is expected through the day
Friday; however, recent guidance suggests that critical (20-25 mph)
wind speeds should persist well into Friday morning, and perhaps
linger in isolated locations until Friday afternoon. These winds are
expected to remain mainly in the immediate lee of the coastal
terrain with localized gusts up to around 60 mph before 18 UTC.
Given the persistent downslope flow regime, conditions are expected
to remain very dry with RH values generally near or below 15% and
will support critical fire weather conditions.

..Moore.. 01/09/2025

.PREV DISCUSSION... /ISSUED 0203 AM CST Thu Jan 09 2025/

...Synopsis...
The upper-level trough in the Northwest will shift south and east on
Friday. This feature is expected to lose amplitude as an upstream
trough moves into the Northwest. As a result, surface high pressure
in the Great Basin/Southwest should lose intensity rather quickly
after the early morning hours.

...Southern California...
The offshore pressure gradient will have been in the process of
gradually weakening for several hours prior to Friday morning. The
weakening trend will continue, especially during the afternoon.
Upper-level wind support will also quickly dissipate after the early
morning as the trough pushes farther east and upper-level ridging
increases in the region. RH will likely remain low through the day.
5-20% RH will be fairly widespread by the afternoon. Winds will
generally reach 15-25 mph. Some locally higher speeds are possible
within the terrain. Given the overall large-scale trends and
high-resolution ensemble guidance, critical fire weather conditions
are expected to occur locally and primarily tied to terrain
features.

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