321  
FNUS75 KGJT 251415  
FWSGJT  
 
SPOT FORECAST FOR MIDDLE MAMM FIRE...USFS  
NATIONAL WEATHER SERVICE GRAND JUNCTION CO  
815 AM MDT SUN AUG 25 2019  
 
FORECAST IS BASED ON FORECAST START TIME OF 1000 MDT ON AUGUST 25.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
HIGH PRESSURE WILL REMAIN ANCHORED OVER THE  
SOUTHWESTERN U.S. WHILE A STRONG TROUGH MOVES ACROSS THE NORTHERN  
ROCKIES. THIS WILL RESULT IN INCREASING SURFACE WINDS UNDER STRONG  
AND DRY WEST-NORTHWESTERLY FLOW ALOFT. TEMPERATURES WILL REMAIN  
ABOVE NORMAL UNDER SUNNY SKIES, THOUGH THERE WILL STILL BE SOME  
PASSING HIGH CLOUDS DURING THE AFTERNOON HOURS. NO PRECIPITATION  
IS EXPECTED OVER THE FIRE FOR THE NEXT SEVERAL DAYS.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-10%) WITH SOME PASSING HIGH CLOUDS.  
MAX TEMPERATURE.....73-78 F.  
MIN HUMIDITY........15-20%.  
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY WINDS 5 TO 8 MPH THROUGH MID  
MORNING THEN BECOMING WEST 13 TO 23 MPH WITH GUSTS  
UP TO 28 MPH.  
SMOKE DISPERSAL.....POOR THROUGH MID MORNING, THEN GOOD. INCREASING TO  
EXCELLENT BY EARLY AFTERNOON.  
HAINES INDEX........4 OR LOW.  
LAL.................1.  
MIXING HEIGHT.......3800 FT AGL INCREASING TO 9500 FT AGL BY MID  
AFTERNOON.  
TRANSPORT WINDS.....WEST 15 TO 25 MPH.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR (0-10%).  
MIN TEMPERATURE.....51-56 F.  
MAX HUMIDITY........34-39%.  
WIND (20 FT)........WEST WINDS 12 TO 22 MPH, THEN BECOMING  
DOWNSLOPE/DOWNVALLEY 5 TO 8 MPH AFTER MIDNIGHT.  
SMOKE DISPERSAL.....VERY GOOD THEN DECREASING TO GOOD. DECREASING TO  
POOR AFTER SUNSET.  
HAINES INDEX........4 OR LOW.  
LAL.................1.  
MIXING HEIGHT.......8500 FT AGL DECREASING TO 1500 FT AGL AFTER  
MIDNIGHT.  
TRANSPORT WINDS.....WEST 14 TO 24 MPH.  
   
MONDAY
 
 
SKY/WEATHER.........SUNNY (0-10%).  
MAX TEMPERATURE.....71-76 F.  
MIN HUMIDITY........11-16%.  
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY WINDS 5 TO 8 MPH THROUGH MID  
MORNING, THEN BECOMING WEST 10 TO 20 MPH.  
SMOKE DISPERSAL.....POOR THROUGH MID MORNING, THEN FAIR. INCREASING  
TO GOOD BY NOON.  
HAINES INDEX........3 OR VERY LOW, THEN BECOMING 4 OR LOW BY MID  
AFTERNOON.  
LAL.................1.  
MIXING HEIGHT.......2000 FT AGL INCREASING TO 7800 FT AGL BY MID TO  
LATE AFTERNOON.  
TRANSPORT WINDS.....WEST 12 TO 18 MPH.  
 

 
FORECASTER...MEGAN STACKHOUSE  
REQUESTED BY...SHANE METCALF  
TYPE OF REQUEST...WILDFIRE  
.TAG 1914200.2/GJT  
.DELDT 08/25/19  
.FORMATTERVERSION 1.0.26  
.EMAIL COGJC@FIRENET.GOV  
 
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