Storm Prediction Center Day 1 Fire Weather Outlook

Created: Thu Oct 31 05:05:02 UTC 2019 ( | )

Click for Day 1 FireWX Areal Outline Product

   ZCZC SPCFWDDY1 ALL
   FNUS21 KWNS 310503

   Day 1 Fire Weather Outlook  
   NWS Storm Prediction Center Norman OK
   1203 AM CDT Thu Oct 31 2019

   Valid 311200Z - 011200Z

   ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE LOS ANGELES AND
   VENTURA COUNTY MOUNTAINS...
   ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR THE RIVERSIDE AND SAN
   DIEGO COUNTY MOUNTAINS...
   ...CRITICAL FIRE WEATHER AREA FOR THE PENINSULAR AND TRANSVERSE
   RANGES IN SOUTHERN CALIFORNIA...

   ...Synopsis...
   A strong surface high pressure centered over the Central Rockies
   will lead to a strong offshore pressure gradient across southern
   California to start the period. This will lead to extremely critical
   fire weather conditions for at least the morning hours today before
   winds weaken during the afternoon.

   ...Southern California...
   Current 05Z observations show around 20 observation sites in
   southern California with extremely critical fire weather conditions
   (30 to 40 mph sustained winds and RH around 5 to 8 percent) ongoing.
   The LAX-DAG pressure gradient is 7.1 mb with strengthening of 1 to 2
   mb expected this morning as the Great Basin radiates and high
   pressure increases. Considering ongoing widespread extremely
   critical conditions, further drying downslope flow across the
   region, and a slight tightening of the gradient, expect extremely
   critical fire weather conditions to persist through at least the
   morning hours. Daytime heating across the Central Rockies and Great
   Basin will lead to significant lowering of the surface pressure
   which should slacken the gradient and bring lighter winds during the
   afternoon hours. Winds may weaken to around 10 to 15 mph, but some
   strengthening is expected again tonight due to a combination of
   another very cold night in the Great Basin and a reinforcing area of
   high pressure moving out of Canada. Winds may increase to near
   critical strength again tonight, but the strongest winds will likely
   be confined to the highest peaks.

   ...Southeast Arizona and Far Southwest New Mexico...
   The same pressure gradient which will be causing the strong offshore
   flow in southern California will also cause some stronger winds in
   southeast Arizona and far southwest New Mexico. Winds are expected
   to be 15 to 20 mph with relative humidity in the 12 to 18 percent
   range. The peak wind speeds are expected during the afternoon during
   the strongest mixing.

   ..Bentley.. 10/31/2019

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

      

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