600  
FNUS75 KFGZ 221439  
FWSFGZ  
 
SPOT FORECAST FOR GRUWELL RX...USFS  
NATIONAL WEATHER SERVICE FLAGSTAFF AZ  
739 AM MST MON FEB 22 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 MST ON FEBRUARY 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE  
NATIONAL WEATHER SERVICE IN FLAGSTAFF, AZ  
   
DISCUSSION
 
FAIRLY LIGHT NORTHEAST WINDS ARE FORECAST TODAY  
THROUGH TONIGHT, WITH MARGINAL VENTILATION DURING THE DAY.  
SOMEWHAT STRONGER SOUTHWEST WINDS ARE EXPECTED TO DEVELOP ON  
TUESDAY AFTERNOON. DRY CONDITIONS ARE FORECAST BOTH DAYS, WITH  
MINIMUM RELATIVE HUMIDITY IN THE TEENS.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 58-62.  
MIN HUMIDITY........14-16 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS AROUND 5-10 MPH. GUSTS TO 15 MPH.  
LAL.................1.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MAX VENT RATE.......MARGINAL.  
CLEARING INDEX......160.  
MIXING HEIGHT.......3200 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 10 TO 15 MPH DECREASING TO 5 TO 10  
MPH IN THE AFTERNOON.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR.  
CHANCE OF PCPN......0 PERCENT.  
MIN TEMPERATURE.....AROUND 28-31.  
MAX HUMIDITY........47-51 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS AROUND 5-10 MPH. GUSTS UP TO 15 MPH  
IN THE EVENING.  
LAL.................1.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIN VENT RATE.......POOR.  
CLEARING INDEX......1.  
MIXING HEIGHT.......300 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 5 TO 10 MPH.  
   
TUESDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
CHANCE OF PCPN......0 PERCENT.  
MAX TEMPERATURE.....AROUND 61-65.  
MIN HUMIDITY........12-14 PERCENT.  
WIND (20 FT)........LIGHT NORTHEAST WINDS IN THE MORNING, BECOMING  
WEST-SOUTHWEST AROUND 10 MPH WITH GUSTS TO  
AROUND 16 MPH IN THE AFTERNOON.  
LAL.................1.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MAX VENT RATE.......VERY GOOD.  
CLEARING INDEX......843.  
MIXING HEIGHT.......4400 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 5 MPH SHIFTING TO THE SOUTH  
LATE IN THE MORNING, THEN SHIFTING TO THE WEST  
15 TO 20 MPH IN THE AFTERNOON.  
 

 
FORECASTER...A TAYLOR  
REQUESTED BY...BURN BOSS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2102668.0/FGZ  
.DELDT 02/22/21  
.FORMATTERVERSION 1.0.26  
.EMAIL GREGORY.SAWYER@USDA.GOV  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab AZ Page Main Text Page