Area Forecast Discussion
Issued by NWS Pendleton, OR

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713
FXUS66 KPDT 091049
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
249 AM PST TUE FEB 9 2016

.SHORT TERM...TODAY THROUGH THURSDAY. LARGE UPPER LEVEL RIDGE
CONTINUES OVER THE REGION TODAY. CURRENT SATELLITE IMAGERY AND
OBSERVATIONS INDICATING FOG IS VERY LIMITED AT THIS POINT.
COVERAGE WILL LIKELY EXPAND SOME FOR THE REMAINDER OF THE NIGHT
AND INTO THE MORNING. OTHERWISE EXPECTING MOST LOCATIONS TO HAVE
SUNNY SKIES TODAY. TEMPERATURES WILL BE SIMILAR TO YESTERDAY WITH
50S TO LOWER 60S. LOW LEVEL INVERSIONS WILL KEEP THE COLUMBIA
BASIN AND ADJACENT VALLEYS A LITTLE COOLER WITH UPPER 40S TO
LOWER 50S FOR THE MOST PART. BREEZY SOUTH WINDS IN THE GRANDE
RONDE VALLEY OTHERWISE WINDS WILL BE FAIRLY LIGHT TODAY. THE RIDGE
AXIS MOVES OFF TO THE EAST WEDNESDAY AS A WEAKENING FRONTAL
BOUNDARY MOVES THROUGH THE PACIFIC NORTHWEST. PRECIPITATION WILL
BE LIMITED TO A FEW SHOWERS OVER THE WASHINGTON CASCADES. MAIN
IMPACT OF THE FRONT WILL BE INCREASING MID AND HIGH LEVEL CLOUDS.
ANOTHER SYSTEM WILL PASS THROUGH THE REGION THURSDAY AS A WEAK
WARM FRONT. THIS WILL KEEP SKIES MOSTLY CLOUDY. SOME LIGHT RAIN
LIKELY MAINLY OVER THE CASCADES. TEMPERATURES WILL REMAIN MILD
WEDNESDAY AND THURSDAY. 94

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...AN APPROACHING WEATHER
SYSTEM WILL WEAKEN THE UPPER LEVEL RIDGE.  MOISTURE WILL BEGIN TO
MOVE IN ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND
THURSDAY EVENING...AND GRADUALLY WORK SOUTHEAST ACROSS THE CWA
THROUGH FRIDAY NIGHT.  BY FRIDAY EVENING ALL AREAS WILL BE UNDER A
CHANCE OF RAIN...WITH HIGHER PROBABILITIES ALONG THE MOUNTAINS. THIS
WILL STILL BE A FAIRLY MILD SYSTEM...AND SNOW LEVELS WILL GRADUALLY
DROP TO ABOUT 6000 FT MSL BY SATURDAY.

A FAST MOVING OPEN TROUGH WITH A COLD FRONT ASSOCIATED WILL MOVE
ACROSS THE AREA ON SATURDAY...LOWERING THE SNOW LEVELS EVEN FURTHER.
SNOW LEVELS SHOULD BE AROUND 3500 FT MSL AFTER THE COLD FRONT
PASSES. SHORTLY AFTER THE FRONTAL PASSAGE THE RIDGE WILL ATTEMPT TO
REBUILD...BUT FOR NOW MODELS KEEP THE AREA UNDER A WESTERLY FLOW.
SNOW LEVELS WILL ONCE AGAIN INCREASE TO ABOUT 7000 FT MSL.

A 30-40KT JET AT 850 MB WILL CONTINUE WITH THIS WESTERLY FLOW SUNDAY
ONWARD.  WITH PROPER MIXING THESE WINDS COULD CREATE SOME BREEZY TO
WINDY CONDITIONS ACROSS THE LOWER ELEVATIONS SUNDAY THROUGH TUESDAY.

TEMPERATURES ARE EXPECTED TO BE MILD AND ABOVE NORMAL FOR THE
EXTENDED...WITH HIGHS IN THE MID 50S TO LOWER 60S ACROSS THE LOWER
ELEVATIONS AND IN THE MID 40S TO LOWER 50S MOUNTAINS. WEBER

&&

.AVIATION...12Z TAFS...VFR CONDITIONS WILL BE PREVALENT FOR THE NEXT
24 HOURS AT ALL TAF SITES. HOWEVER VISIBILITY COULD FALL TO 5-6SM
WITH LOCALIZED MVFR CONDITIONS AT COLUMBIA BASIN TAF SITES THROUGH
18Z. DUE TO LOW CONFIDENCE THESE SITES WILL BE AMENDED IF NEEDED.
OTHERWISE EXPECT JUST SOME HIGH CIRRUS AND SURFACE WINDS LESS THAN
10 KTS FOR THE NEXT 24 HOURS. WEBER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  31  51  36 /   0   0   0  10
ALW  50  31  50  38 /   0   0   0  10
PSC  51  30  50  34 /   0   0   0  10
YKM  52  30  48  34 /   0   0   0  10
HRI  51  30  50  35 /   0   0   0  10
ELN  43  26  46  32 /   0   0   0  10
RDM  66  32  58  36 /   0   0   0  10
LGD  52  33  48  35 /   0   0   0  10
GCD  64  32  54  30 /   0   0   0  10
DLS  55  33  54  40 /   0   0   0  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR ORZ041-044-
     050-502-503-505-507-508-510.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR WAZ024-
     026>029-520-521.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

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