307  
FNUS75 KMSO 192334  
FWSMSO  
 
SPOT FORECAST FOR LOWER OROGRANDE UNITS 5 & 12  
NATIONAL WEATHER SERVICE MISSOULA MT  
534 PM MDT TUE OCT 19 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1800 PDT ON OCTOBER 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
A SHORTWAVE MOVING ACROSS THE REGION TOMORROW WILL  
BRING THE CHANCE FOR SOME RAIN ON THE BURN SITE IN THE AFTERNOON.  
GETTING HUMIDITY LOW ENOUGH WILL BE A CHALLENGE THE NEXT FEW DAYS  
WITH THE INCREASED CLOUD COVER AND RAIN SHOWERS. A STRONGER  
TROUGH AND COLD FRONT THIS WEEKEND WILL BRING ABOUT AN 80 PERCENT  
CHANCE OF A WETTING RAIN BEFORE MONDAY.  
   
TONIGHT
 
 
* SKY/WEATHER.........PARTLY CLOUDY.  
* CWR (> 0.10 INCH)...0 PERCENT.  
* MIN TEMPERATURE.....38-43.  
* MAX HUMIDITY........64-69 PERCENT.  
* WIND (20 FT)........EAST AROUND 5 MPH.  
* MIXING HEIGHT.......5000 FT AGL DECREASING TO LESS THAN 100 FT  
AGL OVERNIGHT.  
* MIXING WINDS........SOUTHEAST 10 MPH.  
* PRECIP AMOUNT.......0.00 INCHES.  
   
WEDNESDAY
 
 
* SKY/WEATHER.........MOSTLY CLOUDY. RAIN LIKELY IN THE AFTERNOON.  
* CWR (> 0.10 INCH)...30 PERCENT.  
* MAX TEMPERATURE.....54-59.  
* MIN HUMIDITY........48-53 PERCENT.  
* WIND (20 FT)........SOUTHEAST 5-6 MPH SHIFTING TO THE SOUTHWEST  
6-8 MPH IN THE AFTERNOON.  
* MIXING HEIGHT.......LESS THAN 100 FT AGL INCREASING TO 2000 FT  
AGL IN THE AFTERNOON.  
* MIXING WINDS........SOUTH 10 MPH.  
* PRECIP AMOUNT.......0.07 INCHES.  
   
WEDNESDAY NIGHT
 
 
* SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY.  
* CWR (> 0.10 INCH)...10 PERCENT.  
* MIN TEMPERATURE.....35-40.  
* MAX HUMIDITY........88-93 PERCENT.  
* WIND (20 FT)........VARIABLE 1-3 MPH.  
* MIXING HEIGHT.......2000 FT AGL DECREASING TO 500 FT AGL  
OVERNIGHT.  
* MIXING WINDS........SOUTH 5 MPH.  
* PRECIP AMOUNT.......0.03 INCHES.  
   
THURSDAY
 
 
* SKY/WEATHER.........PARTLY CLOUDY.  
* CWR (> 0.10 INCH)...0 PERCENT.  
* MAX TEMPERATURE.....57-62.  
* MIN HUMIDITY........48-53 PERCENT.  
* WIND (20 FT)........VARIABLE 2-4 MPH BECOMING SOUTH 5-6 MPH IN  
THE AFTERNOON.  
* MIXING HEIGHT.......500 FT AGL INCREASING TO 5000 FT AGL IN THE  
AFTERNOON.  
* MIXING WINDS........SOUTH 5 MPH.  
* PRECIP AMOUNT.......0.00 INCHES.  
 

 
FORECASTER...LEACH  
REQUESTED BY...THEODORE PETERSON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2119422.2/MSO  
.DELDT 10/19/21  
.FORMATTERVERSION 2.0.0  
.EMAIL THEODORE.PETERSON@USDA.GOV  
 
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