085  
FNUS75 KBOI 210957  
FWSBOI  
 
SPOT FORECAST FOR WILLIAMS CREEK RX...FOREST SERVICE  
NATIONAL WEATHER SERVICE BOISE ID  
357 AM MDT THU OCT 21 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MDT ON OCTOBER 21.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
..WARMER AND DRIER TODAY
 
   
..RAIN WITH GUSTY WINDS FRIDAY
 
 
   
DISCUSSION
 
 
BRIEF HIGH PRESSURE WILL BRING WARM AND DRY CONDITIONS TODAY  
WITH PASSING CLOUDS. A LOW PRESSURE SYSTEM WILL APPROACH FRIDAY  
MORNING AND BRING A SLIGHT CHANCE OF SHOWERS IN THE MORNING.  
THEN, RAIN WILL BE LIKELY IN THE AFTERNOON AND EVENING  
ASSOCIATED WITH THE COLD FRONT. WINDS WILL BE GUSTY FRIDAY  
AFTERNOON, AND WILL SHIFT FROM SOUTHERLY TO WESTERLY. SNOW  
LEVELS WILL LOWER TO AROUND 6000 FT MSL BY FRIDAY NIGHT AS  
PRECIPITATION IS ENDING.  
 
   
TODAY
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
MAX TEMPERATURE.....60 TO 65. WARMER THAN WED.  
MIN HUMIDITY........35 TO 40 PERCENT.  
CWR /0.10 INCH/.....0 PERCENT.  
WIND - EYE LEVEL....SOUTHERLY 5 TO 7 MPH. GUSTS TO 14 MPH IN THE  
AFTERNOON.  
MIXING HEIGHT.......4500 FT AGL.  
TRANSPORT WINDS.....SOUTH AROUND 15 MPH.  
HAINES INDEX........2 VERY LOW.  
VENTILATION INDEX...675 GOOD.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY IN THE EVENING, THEN MOSTLY  
CLOUDY WITH A 20 PERCENT CHANCE OF RAIN AFTER  
MIDNIGHT.  
MIN TEMPERATURE.....46 TO 51.  
MAX HUMIDITY........65 TO 70 PERCENT.  
CWR /0.10 INCH/.....10 PERCENT.  
WIND - EYE LEVEL....EAST-SOUTHEAST AROUND 4 MPH.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH.  
HAINES INDEX........2 VERY LOW.  
VENTILATION INDEX...25 POOR.  
   
FRIDAY
 
 
SKY/WEATHER.........A 20 PERCENT CHANCE OF RAIN IN THE MORNING, THEN  
RAIN LIKELY IN THE AFTERNOON. CHANCE OF RAIN  
INCREASING TO 80 PERCENT. SNOW LEVEL 9KFT MSL  
FRIDAY MORNING, LOWERING TO AROUND 6KFT MSL  
FRIDAY NIGHT.  
MAX TEMPERATURE.....59 TO 64.  
MIN HUMIDITY........34 TO 39 PERCENT.  
CWR /0.10 INCH/.....40 PERCENT.  
WIND - EYE LEVEL....SOUTHEAST 4 TO 6 MPH IN THE MORNING. THEN,  
SOUTHWEST TO WEST 6 TO 9 MPH WITH GUSTS TO  
AROUND 18 MPH AFTER NOON. BRIEF PERIODS OF  
HIGHER GUSTS OVER 20 MPH POSSIBLE IN THE  
LATE AFTERNOON WITH COLD FRONT.  
MIXING HEIGHT.......4000 FT AGL.  
TRANSPORT WINDS.....SOUTH AROUND 15 MPH.  
HAINES INDEX........3 VERY LOW.  
VENTILATION INDEX...600 GOOD.  
 

 
FORECASTER...HENRY  
REQUESTED BY...SHANE KELLEY  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2119847.0/BOI  
 
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