Los Angeles, CA...Long Beach, CA...Santa Ana, CA...Anaheim, CA...Riverside, CA...
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 230650
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0150 AM CDT Mon Oct 23 2017
Valid 231200Z - 241200Z
...CRITICAL FIRE WEATHER AREA FOR COASTAL RANGES OF SOUTHERN
A broad anticyclone will continue to overspread areas of the
Intermountain West and Great Basin, with 1042mb centered over
northern Idaho by the end of the period. East of the high, a low
will rapidly deepen to around 988 mb over the Great Lakes region
late in the forecast period, setting up a favorable surface pressure
gradient for gusty winds in portions of the central and northern
Plains. Meanwhile, the high over the Intermountain West and a weak
trough along the California coast will favor an extended period of
offshore flow and fire weather concerns across coastal ranges of
southern California and the immediate Lower Colorado River Valley
...Coastal Ranges of southern California...
The aforementioned offshore flow will persist throughout the
forecast period, with northeasterly 15-25 mph sustained surface
winds gusting to 40-50 mph especially in terrain-favored areas.
Meanwhile, a continued dry airmass will remain in place across the
region, with already low (near-critical) RH values falling into the
single digits in a few locales as temperatures rise into the 90s F
during peak heating hours. With dry fuels in place, elevated and
critical fire weather delineations remain in place, with critical
areas corresponding to regions of strongest surface flow and
...Southeastern Montana southeastward to central Kansas...
The aforementioned surface pressure gradient between the western
high and Great Lakes low will foster widespread areas of 25-35 mph
northwesterly surface flow with higher gusts in the afternoon -
strongest in areas from west-central South Dakota southward to
northwestern Kansas. Both fuels and RH appear to be limiting
factors for a higher fire weather threat - fuels only marginally
support rapid fire spread and are most favorable in western
Nebraska, while RH values will only fall below critical thresholds
on a spotty basis. An elevated delineation has been made for this
forecast, and morning observations and fuels guidance will be used
to determine whether an upgrade to critical and/or spatial
adjustments to the ongoing elevated area need to be made.
...Lower Colorado River Valley...
Northerly 15-25 mph low-level flow will develop during much of the
day in response to a favorable pressure gradient in the across the
region. Meanwhile, insolation will aid in temperatures rising into
the low 90s F along with very low RH values (around 7-10%).
Elevated to locally critical fire weather conditions will exist,
especially where fuels are dry.
...Please see www.spc.noaa.gov/fire for graphic product...
CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)