667  
FNUS75 KBOI 121928  
FWSBOI  
 
SPOT FORECAST FOR SPIRIT HILL...VALE BLM  
NATIONAL WEATHER SERVICE BOISE ID  
1228 PM MST TUE DEC 12 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1200 MST ON DECEMBER 12.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
..FOG/STRATUS AND LIMITED MIXING THROUGH THURSDAY
 
 
   
DISCUSSION
 
HIGH PRESSURE ALOFT WILL PERSIST OVER THE PACIFIC  
NORTHWEST THROUGH MID-WEEK, ALLOWING STAGNANT CONDITIONS TO  
CONTINUE AT THE SURFACE. EXPECT PERSISTENT FOG/STRATUS, COOL  
TEMPERATURES, AND LIGHT WINDS IN RESPONSE TO AN ONGOING SURFACE-  
BASED INVERSION. DISPERSION WILL BE POOR. THE LIKELIHOOD OF  
BREAKING OUT OF THIS PATTERN REMAINS LOW UNTIL EARLY FRIDAY, WHEN  
A COLD FRONT TRACKS EAST ACROSS OREGON.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........OVERCAST IN FOG/STRATUS. OCCASIONAL FLURRIES.  
CWR /0.10 INCH/.....0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....25 TO 30.  
MIN HUMIDITY........58 TO 63 PERCENT.  
WIND - EYE LEVEL....SOUTHEAST LESS THAN 3 MPH.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH.  
VENTILATION INDEX...25 POOR.  
   
TONIGHT
 
 
SKY/WEATHER.........OVERCAST IN FOG/STRATUS. OCCASIONAL FLURRIES.  
CWR /0.10 INCH/.....0 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....20 TO 25.  
MAX HUMIDITY........75 TO 85 PERCENT.  
WIND - EYE LEVEL....VARIABLE, LESS THAN 3 MPH.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 5 MPH.  
VENTILATION INDEX...10 POOR.  
   
WEDNESDAY
 
 
SKY/WEATHER.........OVERCAST IN FOG/STRATUS. OCCASIONAL FLURRIES.  
CWR /0.10 INCH/.....0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....26 TO 31.  
MIN HUMIDITY........58 TO 63 PERCENT.  
WIND - EYE LEVEL....VARIABLE AND LESS THAN 3 MPH IN THE MORNING, BECOMING  
NORTHWEST AROUND 3 MPH IN THE AFTERNOON.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 5 MPH.  
VENTILATION INDEX...25 POOR.  
 

 
FORECASTER...THIMMESCH  
REQUESTED BY...SCOTT ENGLISH  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1719884.0/BOI  
 
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