727  
FNUS75 KFGZ 011229  
FWSFGZ  
 
SPOT FORECAST FOR SPENCE BASIN RX...USFS  
NATIONAL WEATHER SERVICE FLAGSTAFF AZ  
529 AM MST WED FEB 1 2023  
 
FORECAST IS BASED ON IGNITION TIME OF 1100 MST ON FEBRUARY 01.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE  
NATIONAL WEATHER SERVICE IN FLAGSTAFF, AZ  
   
DISCUSSION
 
 
   
REST OF TODAY
 
COLD AND MOSTLY CALM CONDITIONS WILL PERSIST THROUGH TODAY (WEDNESDAY),  
WITH TEMPERATURES STAYING 5-10 DEGREES BELOW NORMAL FOR THIS TIME OF YEAR.  
WINDS WILL REMAIN PRIMARILY LIGHT OUT OF THE NORTH-NORTHEAST; HOWEVER, AFTERNOON BREEZES  
OF 10-15 KTS WILL BE POSSIBLE. MOSTLY CLEAR SKIES WILL BE PRESENT THROUGH THURSDAY EVENING.  
A GRADUAL WARMING TREND WILL TAKE PLACE MOVING INTO THE SECOND HALF OF THE WEEK.  
WE WILL BE IN A DRIER PATTERN FOR THE NEXT FEW DAYS TOO.  
 
SKY/WEATHER.........SUNNY.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 49.  
MIN HUMIDITY........31 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS AROUND 5 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MAX VENT RATE.......FAIR.  
CLEARING INDEX......246.  
MIXING HEIGHT.......3300 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 5 KNOTS.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR.  
CHANCE OF PCPN......0 PERCENT.  
MIN TEMPERATURE.....AROUND 24.  
MAX HUMIDITY........65 PERCENT.  
WIND (20 FT)........NORTH WINDS AROUND 5 MPH IN THE EVENING  
BECOMING LIGHT.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIN VENT RATE.......POOR.  
CLEARING INDEX......2.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....NORTH AROUND 5 KNOTS.  
   
THURSDAY
 
 
SKY/WEATHER.........SUNNY.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 53.  
MIN HUMIDITY........23 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING NORTHEAST AROUND 5 MPH IN  
THE AFTERNOON.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MAX VENT RATE.......POOR.  
CLEARING INDEX......47.  
MIXING HEIGHT.......2200 FT AGL.  
TRANSPORT WINDS.....NORTH 0 TO 5 KNOTS.  
 

 
FORECASTER...SWENSON  
REQUESTED BY...ANSGAR MITCHELL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2301721.0/FGZ  
.DELDT 02/01/23  
.FORMATTERVERSION 2.0.0  
.EMAIL ANSGAR.MITCHELL@USDA.GOV  
 
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