Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 061000
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
300 AM MST FRI FEB 5 2016

.SHORT TERM...WEAK FRONTAL SYSTEM WILL BRING SCATTERED SNOW SHOWERS
WITH MINOR ACCUMULATION TO THE WEST CENTRAL IDAHO MOUNTAINS AND
HIGHER BOISE MOUNTAINS TODAY.  ONLY CLOUDS EXPECTED ELSEWHERE.
SYSTEM WILL ALSO BRING ENOUGH WIND TO MIX OUT ANY FOG AND ALLOW
TEMPS TO CLIMB TO THE 30S AND 40S.  LIGHTER WINDS TONIGHT AND
SUNDAY UNDER BUILDING HIGH PRESSURE ALOFT WILL ALLOW PATCHY FOG
TO FORM AND ALSO HOLD DOWN DAYTIME TEMPS IN THE VALLEYS AS AN
INVERSION BEGINS TO FORM.

.LONG TERM...SUNDAY NIGHT THROUGH SATURDAY...HIGH AMPLITUDE UPPER
LEVEL RIDGE WILL BE OVER THE REGION THROUGH EARLY NEXT WEEK. THIS
WILL BRING A STRONG INVERSION WHICH WILL LIKELY LEAD TO THE
DEVELOPMENT OF STRATUS AND FOG IN THE LOWER VALLEYS. TEMPERATURES
WILL DEPEND ON HOW MUCH FOG/STRATUS DOES DEVELOP WHICH AT THIS POINT
IS HARD TO DETERMINE. CONTINUED THE TREND OF HIGH TEMPERATURES
IN THE VALLEYS IN THE 30S WITH TEMPERATURES ABOVE THE INVERSION IN
THE 40S AND LOW 50S. UPPER LEVEL RIDGE BEGINS TO BREAK DOWN
WEDNESDAY AS ENERGY FROM AN UPPER LEVEL TROUGH TO OUR WEST MOVES
INLAND.  THIS WILL LIKELY WEAKEN THE INVERSION THURSDAY AND FRIDAY.
UPPER TROUGH MOVES INLAND ON SATURDAY BUT WEAKENS SIGNIFICANTLY AS
IT APPROACHES THE INTERMOUNTAIN WEST. THIS WILL LIKELY BREAK THE
INVERSION BRINGING ABOVE NORMAL TEMPERATURES TO ALL ELEVATIONS...BUT
LITTLE IF ANY PRECIPITATION.

&&

.AVIATION...PATCH IFR/LIFR STRATUS AND VALLEY FOG NEAR KONO THIS
MORNING. ISOLATED SNOW SHOWERS WILL CONTINUE ACROSS THE WEST CENTRAL
MOUNTAINS THROUGH 18Z. EXPECT MAINLY VFR CONDITIONS THIS AFTERNOON
THROUGH SUNDAY EXCEPT FOR PATCHY NIGHT AND MORNING VALLEY FOG IN THE
SNAKE RIVER VALLEY. SURFACE WINDS...SOUTH-SOUTHEAST 10-20 KTS
BECOMING WEST 5-15 KTS SATURDAY AFTERNOON. WINDS ALOFT...WEST TO
NORTHWEST 30-40 KTS THROUGH 10K FT MSL.

&&

.AIR STAGNATION...RELATIVELY GOOD MIXING TODAY AS A WEAK FRONTAL
SYSTEM MOVES THROUGH.  A STRONG RIDGE ALOFT WILL BEGIN INVERSION
CONDITIONS SUNDAY THAT WILL LAST WELL INTO NEXT WEEK.  AIR QUALITY
MAY WORSEN AND FOG AND/OR LOW CLOUDS WILL LIKELY FORM IN THE VALLEYS.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...LC
LONG TERM....JDS
AVIATION.....JDS
AIR STAGNATION...LC


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