760  
FNUS75 KTFX 202301  
FWSTFX  
 
SPOT FORECAST FOR WHITEHORSE...BLM  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
501 PM MDT FRI JUL 20 2018  
 
FORECAST IS BASED ON FORECAST START TIME OF 1700 MDT ON JULY 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
...VERY WARM AND DRY THROUGH THIS EVENING AND AGAIN SATURDAY  
AFTERNOON....  
   
DISCUSSION
 
 
A WARM AND DRY SOUTHWEST FLOW ALOFT REMAINS OVER THE REGION  
THROUGH SATURDAY. CUMULUS CLOUD-COVER WILL INCREASE SLIGHTLY  
THROUGH EARLY THIS EVENING AND WHILE THUNDERSTORM DEVELOPMENT IS  
UNLIKELY, IT CAN NOT BE RULED OUT. SOUTH WINDS THROUGH THIS  
EVENING WILL DECREASE OVERNIGHT AND BECOME WEST TO NORTHWESTERLY  
EARLY SATURDAY MORNING. ANOTHER VERY WARM AND DRY AFTERNOON IS  
EXPECTED SATURDAY WITH JUST A SLIGHT CHANCE OF ISOLATED LATE DAY  
THUNDERSTORM DEVELOPMENT. A COOLER AIRMASS MOVES INTO THE REGION  
FOR SUNDAY AND MONDAY WITH WINDS BECOMING NORTH TO NORTHEASTERLY,  
BUT NO PRECIPITATION IS EXPECTED. HOENISCH  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY. A FEW BUILDING CUMULUS WITH A VERY  
SMALL RISK FOR THUNDERSTORM DEVELOPMENT.  
CWR.................0 PERCENT.  
LAL.................2.  
MAX TEMPERATURE.....91-96.  
MIN HUMIDITY........15-20 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......SOUTH WINDS AROUND 10 MPH WITH OCCASIONAL GUSTS  
UP TO 20 MPH.  
HAINES INDEX........5 MODERATE.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
CWR.................0 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....62-67.  
MAX HUMIDITY........60-65 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......SOUTH WINDS AROUND 10 MPH SHIFTING TO WEST BETWEEN  
0300 AND 0600.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY WITH SCATTERED LATE AFTERNOON CUMULUS  
AND A SLIGHT CHANCE OF AN EVENING THUNDERSTORM.  
CWR.................0 PERCENT.  
LAL.................2.  
MAX TEMPERATURE.....90-95.  
MIN HUMIDITY........12-17 PERCENT.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHWEST WINDS 5 TO 10 MPH.  
HAINES INDEX........6 HIGH.  
 

 
FORECASTER...HOENISCH  
REQUESTED BY...SHANNON BONNEY  
TYPE OF REQUEST...WILDFIRE  
.TAG 1813188.0/TFX  
.DELDT 07/20/18  
.EMAIL SBONNEY@BLM.GOV  
 
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