Storm Prediction Center Day 1 Fire Weather Outlook
Created: Thu Oct 31 05:05:02 UTC 2019 ( | )
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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...