569  
FNUS75 KBYZ 121026  
FWSBYZ  
 
SPOT FORECAST FOR PORCUPINE PILES RX...USFS  
NATIONAL WEATHER SERVICE BILLINGS MT  
326 AM MST TUE DEC 12 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MST ON DECEMBER 12.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
SUNNY CONDITIONS TODAY. INVERSION SHOULD BREAK TO AROUND 4000  
FEET AROUND 1PM WITH WINDS BECOMING NORTHWEST AND INCREASING UP TO  
30 MPH, WITH ISOLATED STRONGER GUSTS POSSIBLE. GUSTY WINDS WILL  
BE SLOW TO WEAKEN TONIGHT. A DISTURBANCE OVERNIGHT WILL BRING A  
CHANCE OF SNOW LIGHT SNOW SHOWERS. WEDNESDAY WILL BE COOLER WITH  
HIGHER RH VALUES, LOWER MIXING HEIGHTS AND NORTHWEST WINDS TO 20  
MPH. CHAMBERS  
   
TODAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....40-45.  
WIND (20 FT)........  
SLOPE/VALLEY.......WEST 5 TO 15 MPH IN THE MORNING, BECOMING  
NORTHWEST 20 TO 30 MPH AROUND 1 PM. ISOLATED GUST  
TO 45 MPH.  
MIXING HEIGHT.......500 FT AGL IN THE MORNING...INCREASING TO 4000  
FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....NORTHWEST 10 TO 20 MPH IN THE MORNING INCREASING TO  
30 TO 45 MPH IN THE AFTERNOON.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR IN THE EVENING...THEN BECOMING MOSTLY  
CLOUDY WITH ISOLATED SNOW SHOWERS AFTER  
MIDNIGHT.  
MIN TEMPERATURE.....18-23.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHWEST WINDS 20 TO 30 MPH IN THE EVENING BECOMING  
10 TO 25 MPH OVERNIGHT.  
MIXING HEIGHT.......800 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 25 TO 40 MPH.  
   
WEDNESDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
MAX TEMPERATURE.....27-32.  
WIND (20 FT)........  
SLOPE/VALLEY.......NORTHWEST WINDS 10 TO 20 MPH.  
MIXING HEIGHT.......1800 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 20 TO 35 MPH.  
 

 
FORECASTER...CHAMBERS  
REQUESTED BY...BEAU KIDD  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1719829.0/BYZ  
.EMAIL BKIDD@FS.FED.US  
 
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