Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 030905
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
305 AM MDT THU SEP 3 2015

.SHORT TERM...YESTERDAY/S COLD FRONT BROUGHT COOLING AND MODERATE
NORTHWEST WINDS TO OUR CWA EXCEPT IN SOUTH-CENTRAL IDAHO.  A SECOND
COLD FRONT WILL COME THROUGH TODAY WITH FURTHER COOLING AS WELL AS
SHOWERS IN NRN ZONES AND THE MOUNTAINS OF SOUTHERN ZONES.  FRONTAL
BOUNDARY WILL WEAKEN IN IDAHO THIS EVENING BUT SHOWERS WILL CONTINUE
IN EASTERN VALLEY COUNTY/ID.  COLD UPPER LOW NEAR VANCOUVER/BC WILL
GO SOUTH ALONG THE WASHINGTON CASCADES TODAY AND OREGON CASCADES
FRIDAY.  SHOWERS WILL SPREAD EWD ACROSS OREGON FRIDAY AFTERNOON
WHILE RESIDUAL SHOWERS CONTINUE IN THE CENTRAL IDAHO MOUNTAINS.
COOLING ALOFT DUE TO THE UPPER LOW WILL CAUSE DESTABILIZATION FRIDAY
AND A SLIGHT CHANCE OF THUNDERSTORMS IN ADDITION TO THE SHOWERS.
MAIN COOLING AT THE SURFACE WILL NOT BE FELT UNTIL FRIDAY NIGHT AND
SATURDAY.  SURFACE WINDS WILL BE LIGHT TO MODERATE NORTHWESTERLY
TODAY THEN LIGHTER NORTHWESTERLY TONIGHT AND FRIDAY.

.LONG TERM...FRIDAY NIGHT THROUGH THURSDAY...MODELS ARE IN GOOD
AGREEMENT SHOWING A DEEP UPPER LEVEL TROUGH OVER THE INTERMOUNTAIN
REGION ON SATURDAY...WITH SCATTERED SHOWERS AT LOWER ELEVATIONS AND
MORE NUMEROUS SHOWERS OVER THE HIGHER TERRAIN. EXPECT BREEZY WEST TO
NORTHWEST WINDS SATURDAY AFTERNOON AND EVENING. HIGHS WILL BE AROUND
20 DEGREES BELOW NORMAL...RISING NO HIGHER THAN THE 60S IN THE LOWER
VALLEYS. LOWS WILL BE 5 TO 15 DEGREES BELOW NORMAL SATURDAY AND
SUNDAY...WITH 40S IN THE LOWER VALLEYS AND 30S OR COLDER IN THE
MOUNTAINS. SNOW LEVELS WILL BE MAINLY ABOVE 7000 FEET...BUT COULD
FALLS AS LOW AS 6000 FEET IN EASTERN OREGON BY SATURDAY MORNING. THE
TROUGH WILL EXIT TO THE EAST ON SUNDAY...REPLACED BY WARMER AND
DRIER WESTERLY FLOW ALOFT. A GRADUAL WARMING TREND WILL RETURN
TEMPERATURES TO NEAR NORMAL ON WEDNESDAY AND ABOVE NORMAL ON
THURSDAY.

&&

.AVIATION...VFR. EXPECT ISOLATED TO SCATTERED SHOWERS MAINLY OVER
THE HIGHER TERRAIN THROUGH TONIGHT. SURFACE WINDS...WEST TO
NORTHWEST 10-15 KTS. WINDS ALOFT...SOUTHWEST TO WEST UP TO 30 KTS AT
10K FT MSL.

WEEKEND OUTLOOK...AN UPPER LEVEL TROUGH WILL BRING SCATTERED SHOWERS
AT LOWER ELEVATIONS AND MORE NUMEROUS SHOWERS OVER THE MOUNTAINS
FRIDAY NIGHT THROUGH SATURDAY EVENING...WITH AREAS OF LOW VFR AND
LOCAL MVFR CEILINGS. CONDITIONS WILL IMPROVE SATURDAY NIGHT...AND
SUNDAY WILL BE VFR WITH DECREASING CLOUDS.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...LC
LONG TERM....JT
AVIATION.....JT



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