Area Forecast Discussion
Issued by NWS Boise, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS65 KBOI 291029
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
329 AM MST MON DEC 29 2014

.SHORT TERM...TODAY THROUGH TUESDAY...UPPER TROUGH AND
ACCOMPANYING ARCTIC FRONT WILL SUPPORT SNOW SHOWERS ACROSS MUCH
OF SE OREGON AND SW IDAHO TODAY. FOCUS OF HEAVIER SNOW SHOWER
ACTIVITY WILL BE ACROSS SE OREGON WITH MORE FAVORABLE UPPER LEVEL
SUPPORT. WITH ELEVATED INSTABILITY AND MOIST BOUNDARY LAYER
SCATTERED LIGHT SNOW SHOWERS WILL DEVELOP IN THE SNAKE RIVER
VALLEY WITH COVERAGE INCREASING THIS AFTERNOON. SNOW SHOWERS TAPER
OFF MOST AREAS TONIGHT...THE EXCEPTION BEING AN AREA FROM SOUTHERN
HARNEY/MALHEUR...THROUGH THE TREASURE VALLEY INTO THE BOISE MTNS
WHERE LIGHT SNOW IS EXPECTED TO CONTINUE. CONFIDENCE HAS INCREASED
AS FORECAST MODELS HAVE BEEN CONSISTENT WITH THE DEVELOPMENT OF
THIS FEATURE. AMOUNTS WILL BE LIGHT...UP TO AN INCH IN THE
VALLEYS AND UP TO TWO IN THE MTNS. SNOW SHOWERS SHUT OFF IN THE
MTNS EARLY TUESDAY MORNING...BUT COULD LINGER INTO THE AFTERNOON
IN THE UPPER TREASURE VALLEY DUE TO SURFACE CONVERGENCE OF THE
ARCTIC AIRMASS. BY TUESDAY HIGH TEMPERATURES WILL BE AROUND 15
DEGREES BELOW NORMAL AND ONLY GETTING COLDER.

.LONG TERM...TUESDAY NIGHT THROUGH MONDAY...UPPER LEVEL LOW
DIGGING INTO SOUTHERN CALIFORNIA WILL DRAW ARCTIC AIR OVER THE
CONTINENTAL DIVIDE INTO THE REGION. SURFACE DEWPOINTS WILL
APPROACH -30F IN CENTRAL IDAHO MOUNTAINS ALLOWING TEMPERATURES TO
PLUMMET UNDER GOOD RADIATIONAL COOLING WITH THE FRESH SNOW. THE
UPPER LEVEL LOW WILL CUTOFF FROM THE MAIN JET STREAM BY
WEDNESDAY...ALLOWING TEMPERATURES ALOFT TO SLOWLY WARM AS A STRONG
UPPER LEVEL RIDGE REMAINS JUST OFF THE WEST COAST. COLD
TEMPERATURES WILL REMAIN LOCKED IN THE VALLEYS WITH THE WARMING
ALOFT AND FOG MAY FORM IN THIS TRANSITION. THE NEXT WEATHER SYSTEM
APPROACHES FROM THE NORTH ON SUNDAY INTO MONDAY BUT THE MODELS
HAVE BEEN TRENDING TOWARDS KEEPING THE RIDGING IN PLACE THROUGH
THE EXTENDED AND THUS DRIER.

&&

.AVIATION...MVFR-IFR UNDER LOW STRATUS AND FOG. SCATTERED SNOW
SHOWERS CONTINUING THROUGH TUESDAY. MOUNTAINS OBSCURED. LIGHT
SURFACE WINDS EXPECTED...EASTERLY 5-15KT EXPECTED IN UPPER TREASURE
AND MAGIC VALLEYS...NORTHERLY 5-10KT ELSEWHERE. WINDS ALOFT NEAR 10K
FT MSL...NW 5-15KT BECOMING NE 5-15KT BY 03Z TUE.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...DG
LONG TERM....KA
AVIATION.....KA


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.