655  
FNUS76 KSTO 271641  
FWSSTO  
 
SPOT FORECAST FOR AMERICAN VALLEY 5...USFS  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
941 AM PDT THU APR 27 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 PDT ON APRIL 27.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
NORTHWEST FLOW ALOFT WILL PREVAIL OVER THE BURN SITE FOR THE NEXT  
SEVERAL DAYS AS HIGH PRESSURE BUILDS OVER THE WEST COAST. SKIES  
EXPECTED TO CLEAR TODAY AS DRIER AIR SPREADS OVER THE REGION.  
LOW PRESSURE DEVELOPING OVER THE GREAT BASIN LATER TONIGHT AND  
FRIDAY WILL CAUSE WINDS TO SHIFT TO THE NORTHEAST SPREADING DRIER  
AIR OVER THE FIRE SITE. WARMING AND DRYING WEATHER CONDITIONS  
CONTINUE THROUGH THE WEEKEND.  
 
   
TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY IN THE MORNING THEN BECOMING  
MOSTLY SUNNY.  
CWR.................0 PERCENT.  
MAX TEMPERATURE.....59-64.  
MIN HUMIDITY........30-35 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......VARIABLE LESS THAN 5 MPH BECOMING WEST TO  
NORTHWEST 3 TO 7 MPH IN THE AFTERNOON.  
RIDGETOP...........NORTHWEST 6 TO 12 MPH.  
MIXING HEIGHT.......RISING TO 7500-8000 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 12 MPH.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY IN THE EVENING THEN CLEARING.  
CWR.................0 PERCENT.  
MIN TEMPERATURE.....33-39.  
MAX HUMIDITY........87-92 PERCENT VALLEYS, 60-67 PERCENT OVER RIDGES.  
WIND (20 FT)........  
SLOPE/VALLEY.......WEST WINDS 4 TO 7 MPH SHIFTING TO THE NORTHEAST  
UP TO 6 MPH AFTER MIDNIGHT.  
RIDGETOP...........NORTHWEST 6 TO 11 MPH SHIFTING TO THE NORTHEAST  
10 TO 15 MPH AFTER MIDNIGHT.  
MIXING HEIGHT.......LOWERING TO 1000-2000 FT AGL OVERNIGHT.  
TRANSPORT WINDS.....NORTHWEST 5 TO 11 MPH SHIFTING TO THE NORTHEAST  
10 TO 15 MPH AFTER MIDNIGHT.  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY.  
CWR.................0 PERCENT.  
MAX TEMPERATURE.....58-63.  
MIN HUMIDITY........12-17 PERCENT RIDGES AND 22-28 PERCENT VALLEYS.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHEAST WINDS 4 TO 10 MPH.  
RIDGETOP...........NORTHEAST 9 TO 16 MPH.  
MIXING HEIGHT.......RISING TO 6500-7000 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 6 TO 13 MPH.  
 

 
FORECASTER...JM  
REQUESTED BY...DISTRICT FUELS OFFICER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1707881.0/STO  
.EMAIL RFTORRES@FS.FED.US  
 
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