SPC Day 1 Fire Weather Outlook
[html]SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1001 AM CST Thu Nov 07 2024
Valid 071700Z - 081200Z
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF VENTURA AND LOS
ANGELES COUNTIES IN SOUTHERN CALIFORNIA...
The previous forecast remains on track, with current surface
observations depicting continued dry offshore flow over southern
California. RH should drop well below 15 percent by afternoon peak
heating, with offshore surface winds sustaining over 20 mph in
terrain-favoring areas, particularly in and near the Ventura Valley,
warranting the continuation of Critical highlights. Elevated
conditions should persist from just east of the Ventura Valley
toward the Laguna Mountains through at least this evening.
..Squitieri.. 11/07/2024
.PREV DISCUSSION... /ISSUED 1247 AM CST Thu Nov 07 2024/
...Synopsis...
A highly amplified large-scale ridge will remain in place across the
West Coast, while a deep midlevel low moves slowly eastward over the
Southwest. Between these two features, a belt of strong deep-layer
northerly flow will continue to overspread the Lower CO River Valley
and southern CA. This large-scale pattern will maintain surface
ridging over the Intermountain West/Great Basin, and an associated
tight offshore pressure gradient across southern CA.
...Southern California...
From Thursday morning through the afternoon, the LAX-DAG gradient
should remain around -4 to -5 mb -- indicating moderate to strong
Santa Ana winds across southern CA. This offshore pressure gradient,
co*bined with the northerly upper-level wind support, will favor
sustained northeasterly surface winds of 20+ mph (with higher gusts)
amid lower teens to single-digit RH across portions of southern CA.
Over the wind-prone corridor of northern Los Angeles into southern
Ventura Counties, several hours of 40-50-mph gusts and single-digit
RH will lead to critical fire-weather conditions -- further
exacerbating a large ongoing wildfire incident in Ventura County.
The pressure gradient will gradually weaken into the evening hours,
with a corresponding decrease in surface winds. However, dry
boundary-layer conditions/poor overnight recoveries are expected
into Day 2/Friday.
...Please see www.spc.noaa.gov/fire for graphic product...
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Source: SPC Day 1 Fire Weather Outlook (http://ht**://www.spc.noaa.gov/products/fire_wx/fwdy1.html)