842  
FNUS75 KGJT 182256  
FWSGJT  
 
SPOT FORECAST FOR MIDDLE FORK FIRE...WY-MRF  
NATIONAL WEATHER SERVICE GRAND JUNCTION CO  
456 PM MDT FRI SEP 18 2020  
 
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON SEPTEMBER 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
A DISTURBANCE AND ASSOCIATED COLD FRONT WILL DIG  
INTO THE WEST COAST TONIGHT. THIS WILL LEAD TO INCREASED  
SOUTHWEST FLOW ALOFT WITH GUSTY CONDITIONS EXPECTED AT THE FIRE  
SATURDAY AFTERNOON. ISOLATED TO SCATTERED SHOWERS WILL ACCOMPANY  
THE FRONT'S PASSAGE SATURDAY BUT THE CHANCE FOR WETTING RAINS  
REMAINS AROUND 10% WITH MINIMAL ACCUMULATION EXPECTED. DRIER AND  
COOLER AIR WILL FILTER INTO THE REGION FOR SUNDAY.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (50-60%) THEN BECOMING MOSTLY  
CLOUDY (70-80%) AFTER 2200.  
MIN TEMPERATURE.....45-50 F.  
MAX HUMIDITY........29-34%.  
WIND (20 FT)........WEST WINDS 5 TO 10 MPH THROUGH SUNSET, THEN  
BECOMING DOWNSLOPE/DOWNVALLEY OVERNIGHT.  
SMOKE DISPERSAL.....GOOD QUICKLY DECREASING TO POOR AROUND 1900.  
HAINES INDEX........6 OR HIGH.  
LAL.................1.  
MIXING HEIGHT.......9500 FT AGL DECREASING TO 900 FT AGL AFTER  
MIDNIGHT.  
TRANSPORT WINDS.....WEST 6 TO 12 MPH SHIFTING TO THE SOUTH AFTER  
2200.  
   
SATURDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (40-50%). ISOLATED SHOWERS IN THE  
AFTERNOON.  
MAX TEMPERATURE.....61-66 F.  
MIN HUMIDITY........22-27%.  
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY WINDS 5 TO 10 MPH THROUGH MID  
MORNING, THEN BECOMING SOUTHWEST 10 TO 18 MPH WITH  
GUSTS TO AROUND 30 MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR THROUGH 1000, THEN GOOD. INCREASING TO  
VERY GOOD BY LATE MORNING BEFORE BECOMING EXCELLENT  
AROUND NOON.  
HAINES INDEX........5 OR MODERATE.  
LAL.................1.  
MIXING HEIGHT.......700 FT AGL INCREASING TO 10900 FT AGL BY EARLY  
TO MID AFTERNOON.  
TRANSPORT WINDS.....SOUTH 8 TO 16 MPH INCREASING TO WEST-SOUTHWEST  
20 TO 30 MPH AROUND NOON.  
   
SATURDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (60-70%) THEN BECOMING PARTLY  
CLOUDY (40-50%) AFTER MIDNIGHT. ISOLATED TO  
SCATTERED SHOWERS.  
MIN TEMPERATURE.....41-46 F.  
MAX HUMIDITY........63-68%.  
WIND (20 FT)........SOUTHWEST WINDS 10 TO 18 WITH GUSTS UP TO 30 MPH  
THROUGH 2200, THEN BECOMING DOWNSLOPE/DOWNVALLEY  
5 TO 10 MPH.  
SMOKE DISPERSAL.....EXCELLENT QUICKLY DECREASING TO POOR AROUND 1900.  
HAINES INDEX........5 OR MODERATE.  
LAL.................1.  
MIXING HEIGHT.......8100 FT AGL DECREASING TO 550 FT AGL AFTER MIDNIGHT.  
TRANSPORT WINDS.....SOUTHWEST 10 TO 20 MPH DECREASING TO SOUTH 6 TO 12  
MPH AROUND SUNSET.  
   
SUNDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (10-20%).  
MAX TEMPERATURE.....58-63 F.  
MIN HUMIDITY........26-31%.  
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY WINDS 5 TO 10 MPH THROUGH MID  
MORNING THEN BECOMING WEST 6 TO 12 MPH WITH GUSTS  
UP TO 25 MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR THROUGH MID MORNING, THEN FAIR. INCREASING TO  
VERY GOOD BY LATE MORNING BEFORE BECOMING EXCELLENT  
AROUND NOON.  
HAINES INDEX........3 OR VERY LOW.  
LAL.................1.  
MIXING HEIGHT.......550 FT AGL INCREASING TO 9000 FT AGL BY MID AFTERNOON.  
TRANSPORT WINDS.....SOUTH 6 TO 12 MPH THROUGH MID MORNING, THEN BECOMING  
SOUTHWEST 15 TO 25 MPH IN THE AFTERNOON.  
 

 
FORECASTER...MEGAN STACKHOUSE  
REQUESTED BY...BRANDON VOEGTLE  
TYPE OF REQUEST...WILDFIRE  
.TAG 2012699.2/GJT  
.DELDT 09/18/20  
.FORMATTERVERSION 1.0.26  
.EMAIL COCRC@FIRENET.GOV  
 
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