Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 261120 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
320 AM PST FRI DEC 26 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK DISTURBANCE WILL
SWING ACROSS OUR EASTERN MOST ZONES EARLY THIS MORNING RESULTING IN
LIGHT SNOW WITH MINIMAL ACCUMULATIONS. A FEW SNOW SHOWERS WILL ALSO
CONTINUE TO DRIFT OFF THE CASCADE CREST INTO THE ADJACENT EAST
SLOPES THIS MORNING. OTHERWISE EXPECT FAIR CONDITIONS WITH A FEW
PASSING CLOUDS DUE TO A PERSISTENT NORTHWEST UPPER LEVEL FLOW. WINDS
WILL BE GENERALLY 10 MPH OR LESS. HIGH TEMPS WILL BE A BIT COOLER
THAN YESTERDAY DUE TO COOLER STARTS THIS MORNING. THE NEXT PACIFIC
SYSTEM WILL BEGIN TO MOVE INTO THE PACIFIC NORTHWEST LATE TONIGHT.
THE SYSTEM`S SURFACE LOW WILL REACH EXTREME SOUTHWEST BRITISH
COLUMBIA BY LATE AFTERNOON SATURDAY. THIS SURFACE LOW WILL CAUSE
WINDS TO INCREASE FROM THE SOUTH AND SOUTHWEST ACROSS OUR OREGON
ZONES AND INTO PORTIONS OF SOUTHEAST WASHINGTON SATURDAY AFTERNOON.
THUS WILL SEE SNOW LEVELS RISE TO BETWEEN 2500 AND 3500 FEET ACROSS
OUR OREGON ZONES. SNOW LEVELS WILL BE LOWER ACROSS WASHINGTON,
ESPECIALLY OVER YAKIMA AND KITTITAS COUNTIES. STARTING SATURDAY,
PRECIP AMOUNTS OVER THE WASHINGTON CASCADE EAST SLOPES, THE BLUE
MOUNTAINS AND INTO WALLOWA COUNTY LOOK TO BE RATHER DECENT. AS SUCH
WILL CONTINUE THE WINTER STORM WATCH IN THE WASHINGTON CASCADE EAST
SLOPES. HAVE ADDED WINTER STORM WATCHES TO THE BLUE MOUNTAINS
(NORTHERN OREGON AND NORTHWEST WASHINGTON) AND WALLOWA COUNTY. 90

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY...THE LOW WILL MOVE NORTH
OF THE AREA ON SATURDAY NIGHT WITH MODERATE PRECIPITATION CONTINUING
INTO SUNDAY. SEVERAL INCHES OF SNOW WILL FALL OVER THE MOUNTAINS
WHILE ELEVATIONS BELOW 3000 FEET WILL SEE MOSTLY RAIN. BREEZY
WESTERLY WINDS CAN ALSO BE EXPECTED WHICH MAY CAUSE SOME
RAIN-SHADOWING EAST OF THE CASCADES. AS A RESULT...CENTRAL OREGON
AND THE YAKIMA AND KITTITAS VALLEYS WILL SEE MINIMAL RAIN AND SNOW
AMOUNTS. ANOTHER LOW WILL MOVE DOWN FROM THE NORTH ON SUNDAY NIGHT
AND MONDAY WITH WIDESPREAD SHOWERS. SNOW LEVELS WILL FALL DURING
THIS PERIOD TO NEAR ZERO BY MONDAY MORNING. THEREFORE...EVEN THE
LOWER COLUMBIA BASIN COULD SEE SOME LIGHT SNOW ACCUMULATIONS. A MUCH
COLDER AND DRIER NORTHERLY FLOW WILL BE OVER THE REGION TUESDAY
THROUGH THURSDAY. THE COLDEST DAY WILL BE TUESDAY WITH DAYTIME HIGH
TEMPERATURES ONLY IN THE TEENS AND 20S AND OVERNIGHT LOWS IN THE
SINGLE DIGITS TO MID TEENS. TEMPERATURES WILL THEN GRADUALLY WARM
THROUGH THE END OF THE WEEK. THE PACIFIC RIDGE WILL WEAKEN ON FRIDAY
AND ANOTHER WEATHER DISTURBANCE WILL MOVE THROUGH THE AREA WITH A
CHANCE OF RAIN AND SNOW. LOWER ELEVATION TEMPERATURES COULD WARM
INTO THE MID 30S ON FRIDAY. COBB

&&

.AVIATION...12Z TAFS...VFR CONDITIONS WITH MOSTLY CLEAR SKIES ARE
FORECAST THROUGH MOST OF THE TAF PERIOD. HOWEVER...WILL NEED TO
WATCH FOR PATCHY FOG TO FORM THIS MORNING AT KPSC AND KALW. MID AND
HIGH LEVEL CLOUDS WILL BEGIN TO INCREASE THIS AFTERNOON AND
OVERNIGHT AS ANOTHER LOW PRESSURE SYSTEM APPROACHES. WINDS WILL
REMAIN LIGHT BELOW 10 KTS.  82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  29  44  32 /  10  10  70  60
ALW  39  31  45  32 /  10  10  80  70
PSC  41  29  43  32 /   0  10  30  30
YKM  39  28  39  28 /   0  10  20  30
HRI  41  28  44  34 /  10   0  50  30
ELN  39  25  36  27 /  10  10  40  30
RDM  39  21  44  25 /  10   0  20  30
LGD  36  23  36  30 /  20  10  70  90
GCD  38  22  41  30 /  20   0  40  80
DLS  47  33  45  34 /  10  10  30  40

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WINTER STORM WATCH FROM LATE TONIGHT THROUGH LATE SATURDAY NIGHT
     ORZ050-502.

WA...WINTER STORM WATCH FROM LATE TONIGHT THROUGH LATE SATURDAY NIGHT
     WAZ030.

     WINTER STORM WATCH FROM LATE TONIGHT THROUGH LATE SATURDAY NIGHT
     WAZ520.

&&

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

$$

90/82/82





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