894  
WWUS86 KSGX 210941  
RFWSGX  
 
URGENT - FIRE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE SAN DIEGO CA  
241 AM PDT SAT OCT 21 2017  
 
...CRITICAL FIRE WEATHER CONDITIONS THIS WEEKEND THROUGH TUESDAY  
BECAUSE OF LOW HUMIDITY AND STRONG GUSTY WINDS...  
 
.HIGH PRESSURE AND AREAS OF STRONG OFFSHORE WINDS WILL BRING  
AREAS OF GUSTY NORTHEAST TO EAST WINDS...ESPECIALLY BELOW PASSES  
AND CANYONS...VERY LOW HUMIDITY...AND HOT WEATHER THIS WEEKEND  
THROUGH TUESDAY. THE MOST EXTREME COMBINATION OF LOW HUMIDITY...  
STRONGER AND MORE WIDESPREAD WINDS...AND HEAT IS EXPECTED ON  
MONDAY AND TUESDAY. WINDS WILL BEGIN IN THE SAN BERNARDINO COUNTY  
MOUNTAINS...THE INLAND EMPIRE AND SANTA ANA MOUNTAINS THIS  
MORNING...THEN INCREASE IN COVERAGE TOWARD THE COAST AND SPREAD  
INTO SAN DIEGO COUNTY SUNDAY THROUGH TUESDAY. STRONGEST WINDS WILL  
BE DURING THE MORNINGS MONDAY AND TUESDAY. WINDS WILL DECREASE  
AND HUMIDITY WILL SLOWLY RISE WEDNESDAY AND BEYOND.  
 
CAZ248-255-257-212130-  
/O.CON.KSGX.FW.W.0004.171021T1700Z-171025T0100Z/  
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS - THE INLAND EMPIRE-  
SAN BERNARDINO COUNTY MOUNTAINS-  
INCLUDING THE MOUNTAIN TOP AND FRONT COUNTRY RANGER DISTRICTS OF  
THE SAN BERNARDINO NATIONAL FOREST-SANTA ANA MOUNTAINS-  
INCLUDING THE TRABUCO RANGER DISTRICT OF THE CLEVELAND NATIONAL  
FOREST-  
241 AM PDT SAT OCT 21 2017  
 
...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO  
6 PM PDT TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY...  
 
* WIND...FOR TODAY AND SUNDAY AREAS OF NORTHEAST WINDS 15 TO 25  
MPH WITH GUSTS TO 35 NEAR THE COASTAL FOOTHILLS AND BELOW PASSES  
AND CANYONS. STRONGER AND MORE WIDESPREAD WINDS FOR MONDAY AND  
TUESDAY WITH AREAS OF NORTHEAST WINDS 20 TO 30 MPH WITH GUSTS TO  
45 MPH. ISOLATED GUSTS TO 50 MPH.  
 
* HUMIDITY...LOWEST DAYTIME HUMIDITY OF 10 TO 15 PERCENT TODAY...5  
TO 10 PERCENT SUNDAY...AND AROUND 5 PERCENT MONDAY AND TUESDAY  
WITH POOREST OVERNIGHT RECOVERY IN THE WINDIER AREAS NEAR THE  
COASTAL FOOTHILLS.  
 
* TIMING...TODAY THROUGH TUESDAY...WITH THE MOST EXTREME  
COMBINATION OF LOW HUMIDITY...STRONGER AND MORE WIDESPREAD  
WINDS...AND HEAT ON MONDAY AND TUESDAY.  
 
* OUTLOOK...WINDS SHOULD WEAKEN WEDNESDAY WITH SOME IMPROVEMENT  
IN HUMIDITY.  
 
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY...  
ESPECIALLY MONDAY AND TUESDAY. OUTDOOR BURNING IS NOT  
RECOMMENDED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A FIRE WEATHER WATCH MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
ARE FORECAST TO OCCUR. A COMBINATION OF STRONG WINDS, LOW  
RELATIVE HUMIDITY AND HOT WEATHER CAN CONTRIBUTE TO EXTREME FIRE  
BEHAVIOR. LISTEN FOR LATER FORECASTS AND POSSIBLE RED FLAG  
WARNINGS.  
 
A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
ARE EITHER OCCURRING NOW....OR WILL SHORTLY. A COMBINATION OF  
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 

 
 
CAZ250-256-258-552-554-212130-  
/O.CON.KSGX.FW.A.0003.171022T1300Z-171025T0100Z/  
SAN DIEGO COUNTY INLAND VALLEYS-RIVERSIDE COUNTY MOUNTAINS-  
INCLUDING THE SAN JACINTO RANGER DISTRICT OF THE SAN BERNARDINO  
NATIONAL FOREST-SAN DIEGO COUNTY MOUNTAINS-  
INCLUDING THE PALOMAR AND DESCANSO RANGER DISTRICTS OF THE  
CLEVELAND NATIONAL FOREST-ORANGE COUNTY COASTAL AREAS-  
ORANGE COUNTY INLAND AREAS-  
241 AM PDT SAT OCT 21 2017  
 
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY MORNING  
THROUGH TUESDAY AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY...  
 
* WIND...FOR SUNDAY...AREAS OF NORTHEAST WINDS 15 TO 25 MPH WITH  
GUSTS TO 35 NEAR THE COASTAL FOOTHILLS AND BELOW PASSES AND  
CANYONS. STRONGER AND MORE WIDESPREAD WINDS FOR MONDAY AND  
TUESDAY WITH AREAS OF NORTHEAST WINDS 20 TO 30 MPH WITH GUSTS TO  
45 MPH. ISOLATED GUSTS TO 50 MPH.  
 
* HUMIDITY...LOWEST DAYTIME HUMIDITY OF 5 TO 10 PERCENT SUNDAY...  
AND AROUND 5 PERCENT MONDAY AND TUESDAY WITH POOREST OVERNIGHT  
RECOVERY IN THE WINDIER AREAS NEAR THE COASTAL FOOTHILLS.  
 
* TIMING...SUNDAY THROUGH TUESDAY...WITH THE MOST EXTREME  
COMBINATION OF LOW HUMIDITY...STRONGER AND MORE WIDESPREAD  
WINDS...AND HEAT ON MONDAY AND TUESDAY.  
 
* OUTLOOK...WINDS SHOULD WEAKEN WEDNESDAY WITH SOME IMPROVEMENT  
IN HUMIDITY.  
 
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY...  
ESPECIALLY MONDAY AND TUESDAY. OUTDOOR BURNING IS NOT  
RECOMMENDED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A FIRE WEATHER WATCH MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
ARE FORECAST TO OCCUR. A COMBINATION OF STRONG WINDS, LOW  
RELATIVE HUMIDITY AND HOT WEATHER CAN CONTRIBUTE TO EXTREME FIRE  
BEHAVIOR. LISTEN FOR LATER FORECASTS AND POSSIBLE RED FLAG  
WARNINGS.  
 

 
 

 
 
17  
 
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