Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 032108
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
308 PM MDT THU SEP 3 2015

.SHORT TERM...TONIGHT THROUGH SATURDAY...UPPER LOW CENTERED OVER
SOUTHERN BRITISH COLUMBIA WILL DIVE SOUTH...REACHING WESTERN
OREGON ON FRIDAY. THE LOW WILL THEN MOVE EASTWARD AND ENTER SE
OREGON/SW IDAHO ON SATURDAY. A BAND OF SHOWERS /OVER SW IDAHO/
AHEAD OF THE LOW WILL WEAKEN THIS EVENING...THEN RE-STRENGTHEN
OVER THE CENTRAL IDAHO MOUNTAINS LATE TONIGHT AND REMAIN NEARLY
STATIONARY THROUGH FRIDAY. MEANWHILE...SHOWERS ACCOMPANYING THE
UPPER LOW WILL SPREAD INTO SE OREGON DURING THE AFTERNOON.
INSTABILITY ASSOCIATED WITH THE COLD UPPER LOW WILL LEAD TO A
SLIGHT CHANCE OF AFT-EVE THUNDERSTORMS. THE SHOWERS WILL CONTINUE
FRIDAY NIGHT-SATURDAY...WITH MOST OF THE ACTIVITY OCCURRING OVER
THE HIGHER TERRAIN. THE TREASURE AND WESTERN MAGIC VALLEYS WILL
RECEIVE LITTLE TO NO RAINFALL...WHILE THE MOUNTAINS WILL RECEIVE
TOTAL AMOUNTS OF UP TO AN INCH THROUGH SATURDAY. SNOW LEVELS WILL
DROP CONSIDERABLY BY SATURDAY MORNING...WITH THE LOWEST LEVELS
NEAR THE UPPER LOW CENTER. SNOW LEVELS COULD BE DOWN TO AROUND
6000 FEET IN SE OREGON AND 7500 FEET IN SW IDAHO BY SATURDAY
MORNING. LIGHT SNOW ACCUMULATIONS ARE POSSIBLE ABOVE THESE
ELEVATIONS ON SATURDAY. DUE TO THE PROXIMITY OF THE COLD UPPER
LOW...THE INSTABILITY WILL ONCE AGAIN SUPPORT A SLIGHT CHANCE OF
AFTERNOON THUNDERSTORMS. TEMPERATURES WILL BE BELOW NORMAL ON
FRIDAY...AND AROUND 5-10 DEGREES LOWER ON SATURDAY WHEN VALLEY
HIGHS WILL ONLY BE IN THE 60S. LOCALLY BREEZY NORTHWEST WINDS ARE
EXPECTED EACH AFTERNOON.

.LONG TERM...SATURDAY NIGHT THROUGH THURSDAY...UPPER LEVEL TROUGH
WILL MOVE OUT OF THE REGION SUNDAY LEAVING THE REGION IN COOL
NORTHWESTERLY FLOW. DRY CONDITIONS EXPECTED THROUGH THE REMAINDER
OF THE PERIOD. TEMPERATURES WILL SLOWLY MODERATE AFTER SUNDAY TO
AROUND NORMAL BY WEDNESDAY. TEMPERATURE FORECAST CONFIDENCE BEYOND
MONDAY IS LOW AS MODELS HAVE A DIFFERENT HANDLING OF THE TROPICAL
SYSTEMS IN THE CENTRAL AND EASTERN PACIFIC OCEAN.

&&

.AVIATION...VFR. BKN-OVC MID LEVEL CEILINGS. LIGHT LOW-VFR
SHOWERS OVER CENTRAL IDAHO MOUNTAINS WITH MOUNTAINS OBSCURED IN
THAT AREA. PARTIAL CLEARING OVERNIGHT. SURFACE WINDS GENERALLY NW
5-15KT. POSSIBLE FOG OVERNIGHT IN SHELTERED MOUNTAIN VALLEYS.
WINDS ALOFT AT 10K FT MSL...SW 15-25KT.

WEEKEND OUTLOOK...CUTOFF LOW PRESSURE SYSTEM WILL BRING PERIODS
OF RAIN...LOW VFR AND LOCAL MVFR CEILINGS TO SE OREGON AND SW
IDAHO FRIDAY AND SATURDAY. VFR CONDITIONS WITH DECREASING CLOUDS
ON SUNDAY.

&&

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

&&

$$

WEATHER.GOV/BOISE

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


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