582  
FXUS65 KBOI 202144  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
244 PM MST MON NOV 20 2017  
   
SHORT TERM
 
WARM-FRONTAL RAIN AND HIGH-MOUNTAIN SNOW ENDED IN  
OREGON BY NOON PST AND WAS MOVING OUT OF WESTERN IDAHO EARLY THIS  
AFTERNOON. PCPN WAS WIDESPREAD THIS MORNING BUT AMOUNTS WERE  
LESS THAN EXPECTED. MOISTURE IS STILL STREAMING INLAND AND LIGHT  
RAIN WILL REDEVELOP TONIGHT AND TUESDAY MAINLY IN NORTHERN AREAS.  
THE SNAKE BASIN TO THE NEVADA BORDER WILL HAVE LITTLE FURTHER RAIN  
TONIGHT AND TUESDAY. PATCHY FOG WILL FORM TONIGHT AND TUESDAY  
MORNING IN THE VALLEYS. ANOTHER WARM FRONT WILL BRING MORE RAIN  
TUESDAY NIGHT, AGAIN MAINLY TO NORTHERN AREAS, BUT SOUTHERN AREAS  
WILL ALSO GET SOME. PATCHY FOG AGAIN TUESDAY NIGHT AND WEDNESDAY  
MORNING IN THE VALLEYS. RAIN WILL DECREASE OR END FROM SOUTH TO  
NORTH WEDNESDAY AND TEMPERATURES WILL CLIMB TO NEAR RECORD HIGHS  
IN SOUTHERN AREAS. GENERALLY LIGHT SOUTHEAST WINDS THROUGH  
WEDNESDAY.  
   
LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY
 
A STRONG UPPER LEVEL  
RIDGE OVER SOUTHERN CALIFORNIA WILL BRING MILD SUBTROPICAL FLOW  
TO THE AREA. TEMPERATURES EXPECTED TO BE AROUND 15-20 DEGREES ABOVE  
NORMAL ON THURSDAY, WITH FREEZING LEVELS AROUND 12,000FT MSL. THE  
BULK OF THE MOISTURE WILL FALL NORTH AND WEST OF OUR FORECAST AREA  
IN OR, WA, AND NORTHERN ID ON THURSDAY AS THE WARM FRONT REMAINS TO  
OUR NORTH. TEMPERATURES WILL AGAIN APPROACH RECORD VALUES ON  
THURSDAY; AROUND 15-20 DEGREES ABOVE NORMAL. THE RIDGE IS  
TEMPORARILY SUPPRESSED LATE THURSDAY ALLOWING SHOWERS TO MOVE  
ACROSS THE REGION ON FRIDAY MORNING. TEMPERATURES WILL COOL AROUND 5-  
10 DEGREES AS THIS MOVES ACROSS THE AREA, WITH SNOW LEVELS GENERALLY  
7000-8000FT MSL. MILD SOUTHWEST FLOW RETURNS ON SATURDAY, BRINGING A  
CHANCE OF SHOWERS OVER THE HIGHER TERRAIN AND TEMPERATURES AROUND 10-  
15 DEGREES ABOVE NORMAL FOR SATURDAY. THE RIDGE IS SUPPRESSED AS A  
SYSTEM OFF THE WEST COAST BEGINS TO MOVE INLAND, COOLING  
TEMPERATURES TO SEASONABLE VALUES AND LOWERING SNOW LEVELS  
CONSIDERABLY.  
 

 
   
AVIATION
 
LOW VFR CEILINGS WITH INTERMITTENT PRECIPITATION  
EXPECTED ACROSS SE OR AND SW ID LOWLANDS. WIDESPREAD PRECIPITATION  
AND MOUNTAIN OBSCURATION WITH IFR CONDITIONS EXPECTED NEAR KMYL AND  
OTHER MOUNTAIN LOCALES. SNOW LEVELS AROUND 6000-7000FT MSL RISING TO  
7500-9000FT MSL BY 00Z/TUE. SURFACE WINDS GENERALLY SW-SE 10-20KT.  
WINDS ALOFT NEAR 10KFT MSL: WESTERLY 35-50KT EASING TO 15-25KT BY  
12Z/TUE AND BECOMING SW 30-40KT BY 21Z/TUE.  
 

 
   
BOI WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
OR...NONE.  
 

 
 

 
 
WWW.WEATHER.GOV/BOISE  
WWW.FACEBOOK.COM/NWSBOISE  
WWW.TWITTER.COM/NWSBOISE  
 
SHORT TERM...LC  
LONG TERM....KA/WH  
AVIATION.....KA  
 
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