158  
FNUS75 KTFX 100829  
FWSTFX  
 
SPOT FORECAST FOR SUN RIVER UNIT 4...USFS  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
229 AM MDT SAT APR 10 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1800 MDT ON APRIL 10.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
VERY STRONG WESTERLY WIND GUSTS ARE EXPECTED THROUGH THIS EVENING  
AS A STRONG WEATHER SYSTEM IMPACTS THE AREA. THE BEST CHANCE OF  
RAIN AND/OR SNOW SHOWERS WILL OCCUR LATE THIS MORNING THROUGH THIS  
AFTERNOON BEHIND THE FIRST COLD FRONT AND AHEAD OF THE SECOND COLD  
FRONT THIS EVENING. WINDS WILL TURN NORTHWEST WITH THE SECOND COLD  
FRONTAL PASSAGE TONIGHT AND THEN DIMINISH BY SUNDAY EVENING.  
 
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY BECOMING MOSTLY CLOUDY BY  
AFTERNOON. SLIGHT CHANCE OF RAIN AND SNOW IN  
THE MORNING, THEN SNOW AND RAIN SHOWERS LIKELY  
IN THE AFTERNOON.  
CWR.................15 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....38-43.  
MIN HUMIDITY........32-37 PERCENT.  
WIND (20 FT)........WINDY. WEST WINDS 15 TO 25 MPH INCREASING TO 25  
TO 30 MPH IN THE AFTERNOON. GUSTS UP TO 55 MPH.  
MIXING HEIGHT.......6000 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 35 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.  
CHANCE OF SNOW SHOWERS IN THE EVENING, THEN  
SLIGHT CHANCE OF SNOW OVERNIGHT.  
CWR.................10 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....22-27.  
MAX HUMIDITY........46-51 PERCENT.  
WIND (20 FT)........WINDY. WEST WINDS 25 TO 30 MPH DECREASING TO 15  
TO 20 MPH OVERNIGHT. GUSTS UP TO 70 MPH IN THE  
EVENING.  
MIXING HEIGHT.......1500 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 30 MPH.  
   
SUNDAY
 
 
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF RAIN AND SNOW  
SHOWERS IN THE AFTERNOON.  
CWR.................10 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....37-42.  
MIN HUMIDITY........32-37 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 10 TO 15 MPH.  
MIXING HEIGHT.......6500 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 15 TO 20 MPH.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 

 
FORECASTER...CASSELL  
REQUESTED BY...ANTHONY EMACIO  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2108240.5/TFX  
.DELDT 04/10/21  
.FORMATTERVERSION 1.0.26  
.EMAIL ANTHONY.EMACIO@USDA.GOV,TFX.OPS@NOAA.GOV  
 
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