335  
WWUS86 KMTR 242141 CCA  
RFWMTR  
 
URGENT - FIRE WEATHER MESSAGE...CORRECTED  
NATIONAL WEATHER SERVICE SAN FRANCISCO CA  
241 PM PDT SUN SEP 24 2017  
 
...RED FLAG WARNING NOW IN EFFECT FOR THE EAST BAY HILLS AND  
THE NORTH BAY HILLS THROUGH WEDNESDAY AFTERNOON...  
 
.THE WARM AND DRY AIR MASS THE OVER THE AREA WILL CONTINUE TO  
PREVAIL THROUGH AT LEAST WEDNESDAY. IN ADDITION, PERIODS OF  
MODERATE AND GUSTY MORTHEAST WINDS ARE EXPECTED AT TIMES. LATEST  
MODEL OUTPUT INDICATES ADDITIONAL DRYING AND SOME INCREASE IN THE  
OFFSHORE WINDS LATE TUESDAY INTO WEDNESDAY.  
 
CAZ511-251400-  
/O.EXB.KMTR.FW.W.0004.000000T0000Z-170928T0000Z/  
EAST BAY HILLS AND THE DIABLO RANGE-  
241 PM PDT SUN SEP 24 2017  
 
...RED FLAG WARNING IN EFFECT UNTIL 5 PM PDT WEDNESDAY FOR LOW  
HUMIDITY AND GUSTY WINDS FOR FIRE WEATHER ZONE 511...  
 
THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A RED  
FLAG WARNING, WHICH IS IN EFFECT UNTIL 5 PM PDT WEDNESDAY.  
 
* AFFECTED AREA...FIRE WEATHER ZONE 511.  
 
* WIND...NORTHEAST WINDS 10 TO 15 MPH...GUSTS 20 MPH. STRONGEST  
OVERNIGHT AND MORNING HOURS.  
 
* HUMIDITY...LOWERING TO AROUND 15 PERCENT AFTERNOONS WITH POOR  
RECOVERY OVERNIGHT...LOCALLY LESS THAN 30 PERCENT.  
 
* HIGHEST THREAT...IS LOCATED OVER THE EAST BAY HILLS ABOVE 1000  
FT WHERE WINDS WILL BE STRONGEST. DOWNED POWERLINES IN REMOTE  
AREAS WILL LIKELY CAUSE NEW FIRE STARTS.  
 
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.  
OUTDOOR BURNING IS NOT RECOMMENDED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF  
GUSTY WINDS AND LOW RELATIVE HUMIDITY CAN CONTRIBUTE TO EXTREME  
FIRE BEHAVIOR.  
 

 
 

 
 
CAZ507-251400-  
/O.EXT.KMTR.FW.W.0004.000000T0000Z-170928T0000Z/  
NORTH BAY MOUNTAINS-  
241 PM PDT SUN SEP 24 2017  
 
...RED FLAG WARNING NOW IN EFFECT UNTIL 5 PM PDT WEDNESDAY FOR LOW  
HUMIDITY AND GUSTY WINDS FOR FIRE WEATHER ZONE 507...  
 
* AFFECTED AREA...FIRE WEATHER ZONE 507.  
 
* WIND...NORTHEAST WINDS 10 TO 20 MPH...GUSTS 25 MPH. STRONGEST  
OVERNIGHT AND MORNING HOURS.  
 
* HUMIDITY...LOWERING TO AROUND 15 PERCENT AFTERNOONS WITH POOR  
RECOVERY OVERNIGHT...LOCALLY LESS THAN 30 PERCENT.  
 
* HIGHEST THREAT...IS LOCATED OVER THE NAPA HILLS AND AROUND  
MOUNT SAINT HELENA WHERE WINDS WILL BE STRONGEST AND HUMIDITY  
LOWEST. DOWNED POWERLINES IN REMOTE AREAS WILL LIKELY CAUSE  
NEW FIRE STARTS.  
 
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.  
OUTDOOR BURNING IS NOT RECOMMENDED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF  
GUSTY WINDS AND LOW RELATIVE HUMIDITY CAN CONTRIBUTE TO EXTREME  
FIRE BEHAVIOR.  
 

 
 

 
 
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