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Day 1 Fire Weather Outlook  
NWS Storm Prediction Center Norman OK
0102 AM CST Tue Dec 10 2024

Valid 101200Z - 111200Z

...EXTREMELY CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE SOUTHERN
CALIFORNIA COAST...
...CRITICAL FIRE WEATHER AREA FOR THE SOUTHERN CALIFORNIA COAST...

...Synopsis...
Critical to extremely critical fire weather conditions are expected
today along the southern CA coast, posing a high-end fire weather
threat. 06 UTC surface observations within the southern CA coastal
mountains are showing widespread RH reductions into the low to mid
teens with sustained winds between 25-35 mph and frequent gusts
upwards of 40-50 mph (occasionally gusting to 60-75 mph in a few
locations). Other observed trends across the region suggest that
winds will increase through the early to mid-morning hours (most
likely peaking during the 12-17 UTC period). Surface pressure obs
across northeast NV are reporting a 1036 mb surface high with
further pressure rises to around 1037-1039 mb expected through 15
UTC. Additionally, latest upper-air analyses show a low to mid-level
cold front pushing south into southern CA. The arrival of the
cooler/more dense air mass and stronger mid-level flow, acco*panied
by further surface pressure rises, should result in strengthening
winds through the morning hours. 

The observed LAX-DAG pressure gradient has also been trending lower
(i.e. stronger) than depicted by most deterministic solutions, but
guidance that has captured recent trends well shows increasingly
widespread 60+ mph wind gusts within the Sierra Madre, San Gabriel,
and San Jacinto mountains by mid-morning. Single-digit RH values
will also beco*e more co*mon by the afternoon hours, given the
duration of the downslope wind event coupled with the diurnal
heating cycle. The prolonged nature of the event is also promoting
rapid drying of 1- and 10-hour fuels, which will increase the fire
weather threat through the day. Extremely critical wind speeds will
gradually begin to abate after roughly 20 UTC, as the surface high
over the Great Basin begins to weaken. However, widespread critical
fire weather conditions should still persist well into early
Wednesday morning.

..Moore.. 12/10/2024

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