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Fire Weather Forecast for: St. Helena ECC Dispatch
National Weather Service - Monterey, CA
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Click on the link(s) below to go directly to the forecast segments
Coastal North Bay...Including Point Reyes National Seashore
North Bay Interior Valleys
North Bay Mountains
Lake County and Upper Cache Creek Area

Dispatch Area Discussion...
256 PM PST MON NOV 23 2009
 HIGH PRESSURE ALOFT AND LIGHT OFFSHORE FLOW WILL MAINTAIN DRY AND
 MILD WEATHER ACROSS THE DISTRICT THROUGH MIDWEEK. MODERATE NORTH TO
 NORTHEAST WINDS IN THE HILLS WILL DECREASE THROUGH TUESDAY
 AFTERNOON. A WEAK WEATHER SYSTEM MOVING INLAND ACROSS FAR NORTHERN
 CALIFORNIA LATE ON THURSDAY MAY BRING SOME LIGHT RAIN TO THE NORTH
 BAY ON THURSDAY EVENING. HIGH PRESSURE WILL THEN REDEVELOP BY THE
 END OF THE WEEK FOR A RETURN TO DRY WEATHER.
Coastal North Bay...Including Point Reyes National Seashore
Forecast Issuance time: 300 PM PST MON NOV 23 2009
TONIGHT...
 SKY/WEATHER.........CLEAR.
 MIN TEMPERATURE.....42-49.
 MAX HUMIDITY........80-95%.
 20-FOOT WINDS.......NORTHWEST WINDS UP TO 10 MPH SHIFTING TO THE
                     NORTH AFTER MIDNIGHT.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 
 TUESDAY...
 SKY/WEATHER.........MOSTLY SUNNY.
 MAX TEMPERATURE.....60-68.
 MIN HUMIDITY........30-50%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 
 TUESDAY NIGHT...
 SKY/WEATHER.........MOSTLY CLEAR.
 MIN TEMPERATURE.....43-49.
 MAX HUMIDITY........80-95%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 
 WEDNESDAY...
 SKY/WEATHER.........SUNNY.
 MAX TEMPERATURE.....60-68.
 MIN HUMIDITY........30-50%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 
 
 EXTENDED...
 .THANKSGIVING DAY...PARTLY CLOUDY. A CHANCE OF LIGHT RAIN NORTH
 OF SAN FRANCISCO DURING THE EVENING. WEST WINDS 5 TO 10 MPH. LOWS IN
 THE 40S. HIGHS IN THE UPPER 50S TO MID 60S.
 .FRIDAY...MOSTLY CLEAR. NORTHWEST WINDS 5 TO 10 MPH. LOWS IN THE
 40S. HIGHS IN THE UPPER 50S TO LOWER 60S.
 .SATURDAY...MOSTLY CLEAR. NORTH WINDS AROUND 5 MPH. LOWS IN THE
 40S. HIGHS IN THE UPPER 50S TO MID 60S.
North Bay Interior Valleys
Forecast Issuance time: 300 PM PST MON NOV 23 2009
TONIGHT...
 SKY/WEATHER.........CLEAR. PATCHY LATE NIGHT FOG.
 MIN TEMPERATURE.....35-44.
 MAX HUMIDITY........80-95%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 
 TUESDAY...
 SKY/WEATHER.........MOSTLY SUNNY. PATCHY FOG EARLY.
 MAX TEMPERATURE.....64-69.
 MIN HUMIDITY........30-45%.
 20-FOOT WINDS.......NORTHEAST WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 
 TUESDAY NIGHT...
 SKY/WEATHER.........MOSTLY CLEAR.
 MIN TEMPERATURE.....36-45.
 MAX HUMIDITY........80-95%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 
 WEDNESDAY...
 SKY/WEATHER.........SUNNY.
 MAX TEMPERATURE.....64-70.
 MIN HUMIDITY........30-45%.
 20-FOOT WINDS.......NORTH WINDS UP TO 5 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 
 
 EXTENDED...
 .THANKSGIVING DAY...PARTLY CLOUDY. A CHANCE OF RAIN NORTH BAY
 VALLEYS DURING THE EVENING. WEST WINDS AROUND 5 MPH. LOWS IN THE
 MID 30S TO MID 40S. HIGHS IN THE LOWER TO MID 60S.
 .FRIDAY AND SATURDAY...MOSTLY CLEAR. NORTHWEST WINDS AROUND 5 MPH.
 LOWS IN THE MID  30S TO MID 40S. HIGHS IN THE 60S.
North Bay Mountains
Forecast Issuance time: 300 PM PST MON NOV 23 2009
TONIGHT...
 SKY/WEATHER.........CLEAR.
 MIN TEMPERATURE.....40-48.
 MAX HUMIDITY........50-80%.
 20-FOOT WINDS.VALLEYS/SLOPE....NORTH WINDS 5 TO 15 MPH.
    RIDGE TOPS.......NORTH WINDS 10 TO 15 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 FREEZING LEVEL......7500 FT ASL.
 
 TUESDAY...
 SKY/WEATHER.........SUNNY.
 MAX TEMPERATURE.....58-69.
 MIN HUMIDITY........35-45%.
 20-FOOT WINDS.VALLEYS/SLOPE....NORTHEAST WINDS 5 TO 15 MPH...DECREASING IN
                     THE AFTERNOON.
    RIDGE TOPS.......NORTHEAST WINDS 10 TO 15 MPH...DECREASING IN
                     THE AFTERNOON.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 MARINE LAYER........NONE.
 FREEZING LEVEL......8000 FT ASL.
 
 TUESDAY NIGHT...
 SKY/WEATHER.........MOSTLY CLEAR.
 MIN TEMPERATURE.....41-50.
 MAX HUMIDITY........60-90%.
 20-FOOT WINDS.VALLEYS/SLOPE....NORTH WINDS AROUND 5 MPH.
    RIDGE TOPS.......NORTH WINDS UP TO 10 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 FREEZING LEVEL......8000 FT ASL.
 
 WEDNESDAY...
 SKY/WEATHER.........SUNNY.
 MAX TEMPERATURE.....61-70.
 MIN HUMIDITY........30-45%.
 20-FOOT WINDS.VALLEYS/SLOPE....NORTH WINDS AROUND 5 MPH.
    RIDGE TOPS.......NORTH WINDS UP TO 10 MPH.
 CWR (>= 0.10 IN)....0.
 LAL.................1.
 FREEZING LEVEL......8000 FT ASL.
 
 
 EXTENDED...
 .THANKSGIVING DAY...PARTLY CLOUDY. A CHANCE OF RAIN NORTH BAY
 MOUNTAINS DURING THE EVENING. WEST WINDS 5 TO 15 MPH. LOWS IN THE
 40S. HIGHS IN THE UPPER 50S TO MID 60S.
 .FRIDAY AND SATURDAY...MOSTLY CLEAR. NORTH WINDS 5 TO 10 MPH. LOWS
 IN THE UPPER 30S AND 40S. HIGHS IN THE 50S TO LOWER 60S.
Lake County and Upper Cache Creek Area
Forecast Issuance time: 300 PM PST MON NOV 23 2009
TONIGHT...
 SKY/WEATHER.........MOSTLY CLEAR. PATCHY VALLEY FOG AFTER MIDNIGHT. 
 MIN TEMPERATURE.....36-42. 
 MAX HUMIDITY........48-68 PERCENT LOWER ELEVATIONS...AND 35-50 
                     PERCENT HIGHER ELEVATIONS. 
 20-FOOT WINDS....... 
     VALLEYS/LWR SLOPES...NORTH WINDS 6 TO 13 MPH. 
     RIDGES/UPR SLOPES....NORTHEAST WINDS 10 TO 20 MPH WITH LOCAL     
                          GUSTS UP TO 35 MPH. 
 CWR (>= 0.10 IN)....0. 
 
 TUESDAY...
 SKY/WEATHER.........SUNNY. PATCHY VALLEY FOG EARLY IN THE MORNING. 
 MAX TEMPERATURE.....61-71. 
 MIN HUMIDITY........19-35 PERCENT. 
 20-FOOT WINDS....... 
     VALLEYS/LWR SLOPES...UPSLOPE/UPVALLEY 2 TO 6 MPH.     
     RIDGES/UPR SLOPES....NORTH WINDS 7 TO 15 MPH IN THE MORNING      
                          BECOMING VARIABLE 3 TO 8 MPH. 
 CWR (>= 0.10 IN)....0. 
 
 TUESDAY NIGHT...
 SKY/WEATHER.........CLEAR. 
 MIN TEMPERATURE.....39-45. 
 MAX HUMIDITY........58-74 PERCENT LOWER ELEVATIONS...AND 46-66 
                     PERCENT HIGHER ELEVATIONS. 
 20-FOOT WINDS....... 
     VALLEYS/LWR SLOPES...DOWNSLOPE/DOWNVALLEY 3 TO 7 MPH BECOMING    
                          NORTH 5 TO 10 MPH AFTER MIDNIGHT.           
     RIDGES/UPR SLOPES....NORTH WINDS 8 TO 16 MPH WITH LOCAL GUSTS UP 
                          TO 28 MPH. 
 CWR (>= 0.10 IN)....0. 
 
 WEDNESDAY...
 SKY/WEATHER.........SUNNY. 
 MAX TEMPERATURE.....60-71. 
 MIN HUMIDITY........21-36 PERCENT. 
 20-FOOT WINDS....... 
     VALLEYS/LWR SLOPES...UPSLOPE/UPVALLEY 2 TO 6 MPH. 
     RIDGES/UPR SLOPES....VARIABLE 3 TO 8 MPH. 
 CWR (>= 0.10 IN)....0.
EXTENDED...
 .THANKSGIVING DAY...MOSTLY CLEAR. SLIGHT CHANCE OF RAIN AND SNOW. 
 LOWS IN THE 30S. HIGHS 45 TO 55. SOUTH WINDS 10 TO 20 MPH. 
 .FRIDAY...MOSTLY CLOUDY. RAIN LIKELY AND A CHANCE OF SNOW SHOWERS 
 THURSDAY NIGHT INTO EARLY FRIDAY. LOWS IN THE 30S. HIGHS IN THE 40S. 
 NORTH WINDS 10 TO 20 MPH WITH LOCAL GUSTS 30 TO 40 MPH. 
 .SATURDAY...PARTLY CLOUDY. LOWS 25 TO 35. HIGHS 45 TO 55.
 NORTHEAST WINDS 10 TO 20 MPH WITH LOCAL GUSTS 30 TO 40 MPH.

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Page last Modified: Update - 05/13/2009

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