weather.gov Site Map News Organization Search for: SPC NCEP All NOAA Search by city or zip code. Press enter or select the go button to submit request Local forecast by "City, St" or "ZIP" SPC on Facebook @NWSSPC NCEP Quarterly Newsletter Home ( Classic ) SPC Products All SPC Forecasts Current Watches Meso. Discussions Conv. Outlooks Tstm. Outlooks Fire Wx Outlooks RSS Feeds E-Mail Alerts Weather Information Storm Reports Storm Reports Dev. NWS Hazards Map National RADAR Product Archive NOAA Weather Radio Research Non-op. Products Forecast Tools Svr. Tstm. Events SPC Publications SPC-NSSL HWT Education & Outreach About the SPC SPC FAQ About Tornadoes About Derechos Video Lecture Series WCM Page Enh. Fujita Page Our History Public Tours Misc. Staff Contact Us SPC Feedback Day 2 FW Outlook > Oct 27, 2020 Day 1 Fire Weather Outlook Updated: Tue Oct 27 06:08:03 UTC 2020 ( Print Version | | ) Day 1 Fire Pop. Cities CWAs RFCs Interstates Counties ARTCC FEMA Regions Day 1 Surface Analysis Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area Critical 29,878 14,484,626 Sacramento, CA...Santa Ana, CA...Anaheim, CA...Riverside, CA...Stockton, CA... ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 270607
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
0107 AM CDT Tue Oct 27 2020
Valid 271200Z - 281200Z
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF NORTHERN CALIFORNIA...
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF SOUTHERN CALIFORNIA...
...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF THE LOWER COLORADO
RIVER VALLEY...
...Synopsis...
Persistent surface ridging across a large part of the Intermountain
West/Great Basin and surface troughing from the California coast
southeastward through Baja California and the Lower Colorado River
Valley will continue to foster elevated to critical fire-weather
conditions in several areas across California, Nevada, and Arizona.
Models do indicate that the gradient between these two synoptic
features will slacken over the course of the forecast period and
reduce surface wind speeds especially in northern California.
...Northern/central California...
Over the course of the day, surface heating/vertical mixing and the
existing pressure gradient across the area will once again increase
wind speeds into the 20-35 mph range, with higher gusts (to 60 mph)
expected in typical terrain-favored areas. The residing airmass is
dry and will remain so throughout the period, with critically low RH
values through the day (5-15%) and poor overnight recoveries.
Elevated to critical fire weather remains likely - with critical
highlights tied to areas of strongest surface winds.
...Southern California...
The aforementioned offshore gradient will continue to maintain a
very dry airmass across much of the region, with very poor overnight
recovery resulting in critically low RH (5-15%) even at the start of
the forecast period (12Z Tue). These dry conditions will persist
throughout the day as temperatures warm into the 70s and low 80s F.
Meanwhile, 25-35 mph northeasterly surface winds will develop
through the day, with gusts perhaps exceeding 60 mph especially in
terrain-favored areas. Fuels remain dry across the region and
support of fire spread. Elevated and critical delineations remain
in place to address the aforementioned scenario.
...Lower Colorado River Valley...
Latest models (and particularly high-resolution guidance) depict
areas of gusty northerly winds in the vicinity of the Lower Colorado
River that will strengthen into the 20-25 mph range with higher
gusts. These winds will occur within a dry airmass, with widespread
single-digit RH values expected during the afternoon as temperatures
rise into the 70s and 80s F. Dry fuel beds will potentially carry
large fires. Thus, the critical delineation has been added.
..Cook.. 10/27/2020
...Please see www.spc.noaa.gov/fire for graphic product...
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