602  
FXUS65 KBOI 231030  
AFDBOI  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BOISE ID  
330 AM MST FRI FEB 23 2018  
   
SHORT TERM...TODAY THROUGH SATURDAY
 
AFTER A MOSTLY DRY DAY  
TODAY, ANOTHER WINTER STORM WILL APPROACH FROM THE NORTHWEST  
TONIGHT AND IMPACT THE AREA INTO SATURDAY NIGHT. A WINTER STORM  
WATCH HAS BEEN ISSUED FOR MUCH OF THE AREA. DETAILS OF EXPECTED  
SNOW AMOUNTS: 1 TO 3 INCHES BELOW 3000 FEET, 3 TO 6 INCHES BETWEEN  
3000 AND 6000 FEET (INCLUDING MAJOR MOUNTAIN-VALLEYS SUCH AS LONG  
VALLEY), AND 8 TO 12 INCHES ABOVE 6000 FEET. WINDS WILL BE  
SIGNIFICANT SATURDAY, AND BLOWING SNOW HAS BEEN ADDED TO THE  
FORECAST FOR MUCH OF THE AREA. AT THIS TIME, IT APPEARS THAT A  
RATHER SMALL PART OF THE UPPER TREASURE VALLEY MAY GET 1 TO 3  
INCHES OF SNOW. THIS AREA IS BASICALLY THE NORTHERN 10-20 MILES OF  
THE VALLEY. THERE WILL BE A SHARP NORTH/SOUTH GRADIENT IN  
SNOWFALL ACROSS THE TREASURE VALLEY WITH THIS STORM, MUCH AS THERE  
WAS A SHARP EAST-WEST GRADIENT IN THE STORM THURSDAY. TEMPS WILL  
REMAIN BELOW NORMAL THROUGH THE SHORT TERM. TODAY, LOCATIONS THAT  
RECEIVED SNOWFALL THURSDAY WILL BE EVEN COOLER THAN GUIDANCE  
INDICATES, AND ADJUSTMENTS HAVE BEEN MADE ACCORDINGLY.  
   
LONG TERM...SATURDAY NIGHT THROUGH THURSDAY
 
COOL NORTHWEST  
FLOW WILL CONTINUE IN THE EXTENDED PERIOD, WITH BELOW NORMAL  
TEMPERATURES CONTINUING. A SYSTEM WILL ARRIVE FROM THE GULF OF  
ALASKA ON SUNDAY AFTERNOON. SNOW WILL SPREAD ACROSS THE AREA  
SUNDAY EVENING AS A COLD FRONT MOVES THROUGH THE REGION. WNW FLOW  
WILL FAVOR A BRIEF PERIOD OF MODERATE TO HEAVY SNOW ACROSS THE  
WEST CENTRAL AND BOISE MOUNTAINS WITH THIS SYSTEM. THE SYSTEM WILL  
QUICKLY MOVE SOUTH ON MONDAY MORNING, WITH SNOW SHOWERS LINGERING  
ACROSS THE HIGHER TERRAIN THROUGH MONDAY EVENING. TUESDAY WILL BE  
GENERALLY DRY IN BETWEEN SYSTEMS, BEFORE ANOTHER SYSTEM ARRIVES  
TUESDAY AFTERNOON INTO WEDNESDAY FROM THE NORTHWEST. MODEL  
CONFIDENCE IS BELOW-NORMAL AFTER WEDNESDAY, BUT IT APPEARS AN  
ACTIVE PATTERN WILL CONTINUE.  
 

 
   
AVIATION
 
GENERALLY VFR. ISOLATED SNOW SHOWERS WITH AREAS OF  
MOUNTAIN OBSCURATION THIS MORNING, CLEARING THIS AFTERNOON.  
INCREASING HIGH CLOUDS LATE IN THE AFTERNOON. SNOW DEVELOPING NW OF  
KBNO-KBKE AFTER 00Z/SAT. LIGHT SURFACE WINDS THIS MORNING, BECOMING  
NW 5-15KT DURING THE AFTERNOON. WINDS ALOFT AT 10KFT MSL: NW 5-15KT  
INCREASING TO NW 30-40KT BY 03Z/SAT.  
 
WEEKEND OUTLOOK...SCATTERED TO NUMEROUS IFR-LIFR SNOW SHOWERS ON  
SATURDAY WITH MOUNTAIN OBSCURATION. SW-SE SURFACE WINDS 5-15KT. SNOW  
CONTINUING ON SUNDAY OVER HIGHER TERRAIN WITH MOUNTAIN  
OBSCURATION.  
 

 
   
BOI WATCHES/WARNINGS/ADVISORIES
 
 
ID...WINTER STORM WATCH FROM THIS EVENING THROUGH SATURDAY EVENING  
IDZ011-013>016-028>030-033.  
OR...WINTER STORM WATCH FROM THIS EVENING THROUGH SATURDAY EVENING  
ORZ062.  
 

 
 

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