488  
FNUS76 KMTR 061935  
FWSMTR  
 
SPOT FORECAST FOR GRANT RANCH RX...CALFIRE SANTA CLARA-SCU  
NATIONAL WEATHER SERVICE SAN FRANCISCO CA  
1235 PM PDT MON OCT 6 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 1756 PDT ON OCTOBER 06.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
WESTERLY WINDS WILL PREVAIL THROUGH EARLY AFTERNOON  
BEFORE VEERING NORTHWESTERLY BY LATE AFTERNOON. WINDS WILL THEN  
BECOME NORTHEASTERLY (OFFSHORE) DURING THE OVERNIGHT HOURS AND IN  
INTO EARLY TUESDAY MORNING UNDER CLEAR SKIES. THUS, RELATIVE  
HUMIDITIES WILL BE AROUND 30% THIS AFTERNOON WITH TEMPERATURES  
FORECAST TO BE IN THE UPPER 70S TO LOWER 80S. POOR HUMIDITY  
RECOVERIES ARE EXPECTED OVERNIGHT, ONLY REACHING UP TO 50%.  
ONSHORE FLOW WILL RETURN BY THURSDAY WITH RAIN POSSIBLE STARTING  
FRIDAY AND LASTING THROUGH THE WEEKEND. THE RAIN CHANCES AND  
AMOUNT ARE STILL IN QUESTION, BUT HIGHER HUMIDITY AND COOLER  
WEATHER ARE IN STORE THIS WEEKEND EITHER WAY.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....77-81.  
MIN HUMIDITY........30-34 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS AROUND 13 MPH.  
CWR.................0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
MIXING HEIGHT.......3100 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 10 MPH.  
MARINE LAYER........NONE.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR.  
MIN TEMPERATURE.....57-61.  
MAX HUMIDITY........43-47 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 7 TO 10 MPH.  
CWR.................0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....NORTH AROUND 8 MPH.  
MARINE LAYER........NONE.  
   
TUESDAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....80-84.  
MIN HUMIDITY........25-29 PERCENT.  
WIND (20 FT)........NORTH WINDS 5 TO 9 MPH SHIFTING TO THE WEST 8  
TO 13 MPH IN THE AFTERNOON.  
CWR.................0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
MIXING HEIGHT.......3500 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 8 MPH.  
MARINE LAYER........NONE.  
 

 
FORECASTER...R_GASS  
REQUESTED BY...ERIC COUPER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2522957.1/MTR  
.DELDT 10/06/25  
.FORMATTERVERSION 2.0.0  
.EMAIL SCU.ECC@FIRE.CA.GOV,ALEX.MIKESELL@FIRE.CA.GOV,COLE.PERIERA@FIRE.CA.GOV  
 
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