Skip Navigation Links weather.gov 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap


 
USA.gov is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

    Day 2 FW Outlook >
Dec 15, 2017 Day 1 Fire Weather Outlook
Updated: Fri Dec 15 07:04:03 UTC 2017 (Print Version | 20171215 1200Z Day 1 FireWX shapefile | 20171215 1200Z Day 1 FireWX KML)
Day 1 Fire
 Population  Cities/Towns  CWAs  Interstates  Counties  FEMA Regions  Day 1 Surface Analysis

Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
Critical 8,191 6,962,791 Riverside, CA...Glendale, CA...San Bernardino, CA...Ontario, CA...Fontana, CA...
   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 150702

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   0102 AM CST Fri Dec 15 2017

   Valid 151200Z - 161200Z

   ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF SOUTHERN CALIFORNIA...

   ...Synopsis...
   ...Portions of Central CA...

   An upper ridge over the western U.S. will break down this period as
   a shortwave trough moves over the Pacific Northwest. Overnight this
   trough will dig southward, becoming oriented from southwest MT to
   southern CA by Saturday morning. Strong deep-layer northerly flow on
   the back side of the trough will overspread the Pacific Northwest
   and much of California. Elevated to locally critical conditions are
   expected to develop over the mountains and foothills in the vicinity
   of the Bay Area along the central CA coast and adjacent portions of
   the Sacramento Valley late in the period. In higher elevations, RH
   values will begin to fall into the 20-35 percent range early
   Saturday morning as sustained north winds increase to 15-25 mph with
   higher gusts. 

   ...Portions of Southern CA...

   High pressure over the Great Basin this morning will weaken later
   today as the upper ridge breaks down ahead of the shortwave trough
   moving into the Pacific Northwest. Gusty offshore winds will
   continue across the southern CA mountains and foothills this morning
   and several hours of critical conditions are expected. While wind
   speeds are then expected to weaken during the afternoon and evening,
   conditions will remain very dry and elevated fire weather conditions
   will continue for much of the period, especially in higher
   elevations where overnight RH recovery will be poor.

   ..Leitman.. 12/15/2017

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

   CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)
      
Related Fire Weather Web Links
Top/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
spc.feedback@noaa.gov
Page last modified: December 15, 2017
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities