Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 221032
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
330 AM MST SAT NOV 22 2014

.SHORT TERM...TODAY THROUGH SUNDAY...THE SUB-FREEZING TEMPERATURES
BETWEEN NAMPA AND BAKER CITY AND NORTH INTO THE UPPER WEISER BASIN
HAVE BEEN SLOWLY RISING THROUGH THE NIGHT. IN THE LAST COUPLE OF
HOURS...TEMPERATURES WERE AT OR BELOW 32F IN THE LOWER TREASURE
VALLEY CENTERED NEAR ONTARIO WITH ONTARIO ASOS REPORTING FREEZING
RAIN IN THE PAST HOUR. BASED ON THESE TRENDS...EXPECT THE
TEMPERATURES TO CLIMB ABOVE FREEZING WITHIN THE NEXT COUPLE OF
HOURS AND IF THEY DO...WE WILL CANCEL THE WINTER WEATHER ADVISORY
FOR THE VALLEY ZONES. THE WINTER WEATHER ADVISORIES WILL REMAIN IN
EFFECT FOR THE WEST CENTRAL/BOISE MOUNTAIN/CAMAS PRAIRIE ZONES FOR
THE REMAINDER OF THIS MORNING FOR ADDITIONAL SNOWFALL AMOUNTS OF
1-4 INCHES WITH HIGHER AMOUNTS IN THE MOUNTAINS. THE SNOW WILL
TAPER OFF TO SNOW SHOWERS WITH ADDITIONAL LIGHT ACCUMULATIONS THIS
AFTERNOON.

GUSTY SE-SW WINDS THIS MORNING WILL SHIFT TO THE NORTHWEST BEHIND
A COLD FRONT AND REMAIN GUSTY THROUGH THIS AFTERNOON. CORE OF
STRONGEST WINDS WILL BE ACROSS THE SOUTH...WITH GUSTS UP TO 45
MPH EXPECTED...ESPECIALLY ALONG THE NEVADA BORDER. TEMPERATURES
WILL BE WARMER TODAY IN THE LOWER VALLEYS...BUT COOLER
ELSEWHERE...WHICH IS A COMMON OCCURRENCE WITH COLD FRONTS
FOLLOWING A STRONG INVERSION EVENT.

NORTHWEST FLOW WILL TREND DRIER MOST AREAS THROUGH SUNDAY...EXCEPT
IN THE NORTHERN MOUNTAINS AS SNOW SHOWERS WILL LINGER...RESULTING
IN ADDITIONAL LIGHT SNOW ACCUMULATIONS. WINDS WILL DIMINISH IN
MOST LOCATIONS AS WELL...EXCEPT GUSTY WINDS WILL PERSIST IN THE
WESTERN MAGIC VALLEY. TEMPERATURES WILL BE COOLER ON SUNDAY.

.LONG TERM...SUNDAY NIGHT THROUGH SATURDAY...MOIST NORTHWESTERLY
FLOW WILL CONTINUE WITH PRECIPITATION FOCUSED OVER THE NORTHERN
TERRAIN THROUGH WEDNESDAY AS A RIDGE BEGINS TO BUILD INTO
SOUTHWEST OREGON AND NORTHERN CALIFORNIA. AS THIS RIDGE MOVES
INLAND PRECIPITATION WILL MOVE NORTH AWAY FROM THE FORECAST AREA
TOWARDS THE NORTHEAST WITH DRY CONDITIONS EXPECTED THROUGH FRIDAY.
INVERSION CONDITIONS SHOULD REFORM STARTING WEDNESDAY BUT
CONFIDENCE IS LOW ON THE STRENGTH...AS THE STRENGTH OF THE
INVERSION WILL DEPEND ON WHETHER OR NOT THERE IS SNOW COVER AND
WHERE THE SNOW COVER IS LOCATED IN THE VALLEYS. AFTER FRIDAY THE
RIDGE APPEARS TO BREAK DOWN ALLOWING PACIFIC MOISTURE TO MOVE BACK
INTO THE REGION.

&&

.AVIATION...RAIN AND MOUNTAIN SNOW SHOWERS DIMINISHING THIS
EVENING. MOUNTAINS OBSCURED. PATCHY FOG IN LOWER TREASURE VALLEY
NEAR KONO AND MOUNTAIN VALLEYS. SNOW LEVELS 5K FT MSL NEAR KMYL
AND NEAR 10K FT MSL NEAR KREO LOWERING TO 4K FT MSL WITH COLD
FRONT. COLD FRONT EXPECTED TO MOVE THROUGH KBOI BETWEEN 15Z AND
18Z SAT...KTWF BETWEEN 21Z SAT AND 00Z SUN. SURFACE WINDS
SOUTHEASTERLY 5-15KT THROUGH MAGIC/TREASURE/BAKER VALLEYS
SHIFTING TO THE NORTHWEST 10-20KT WITH COLD FRONT. SURFACE WINDS
IN SE OREGON SW 15-25KT BECOMING WESTERLY 10-20KT WITH COLD FRONT.
WINDS ALOFT NEAR 10K FEET MSL...WESTERLY 50-70KT LOWERING TO NW
30-45KT BY 00Z SUN.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...WINTER WEATHER ADVISORY UNTIL 8 AM MST THIS MORNING IDZ012-033.
     WINTER WEATHER ADVISORY UNTIL 11 AM MST THIS MORNING
     IDZ011-013-028.
OR...WINTER WEATHER ADVISORY UNTIL 8 AM MST THIS MORNING ORZ064.

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...BW
LONG TERM....KA
AVIATION.....KA


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