Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 221209
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
400 AM PST SAT NOV 22 2014

.SHORT TERM...TODAY THROUGH SUNDAY. COLD FRONT WILL BE EXITING THE
REGION THIS MORNING. AREA OF STEADY RAIN OVER NORTHEAST OREGON WILL
MOVE EAST WITH THE FRONT. STRONG ONSHORE FLOW WILL MAINTAIN
RAIN/SNOW OVER THE CASCADES. A FAST MOVING SYSTEM SEEN ON SATELLITE
OFFSHORE WILL THEN MOVE THROUGH LATER THIS MORNING INTO THE
AFTERNOON. THIS WILL BRING ADDITIONAL CLOUDS AND PRECIPITATION.
FREEZING LEVELS WILL BE LOWER TODAY AND EXPECT SOME ACCUMULATING
SNOW IN THE MOUNTAINS ESPECIALLY THE CASCADES AND BLUES. IT WILL
REMAIN BREEZY TODAY FOR MANY LOCATIONS DUE TO STRONG WINDS ALOFT.
PRECIPITATION WILL DIMINISH TONIGHT WITH THE BEST CHANCES STILL OVER
THE CASCADES AND BLUES. ANOTHER SYSTEM IN THE NORTHWEST FLOW ALOFT
WILL MOVE THROUGH ON SUNDAY WITH RAIN AND MOUNTAIN SNOW. WASHINGTON
CASCADES LOOK TO PICK UP THE MOST PRECIP WITH THIS ONE AND SHOULD
SEE SOME ACCUMULATING SNOW. BREEZY CONDITIONS CONTINUE. HIGHS THE
NEXT FEW DAYS MOSTLY IN THE 30S MOUNTAINS AND 40S LOWER ELEVATIONS.
94

.LONG TERM...SUNDAY NIGHT THROUGH SATURDAY...MEDIUM RANGE MODELS ARE
IN GOOD AGREEMENT THROUGH EARLY NEXT WEEK THEN DIVERGE FROM MID WEEK
ONWARD. FOR SUNDAY NIGHT EXPECT RAIN AND HIGH MOUNTAIN SNOW TO TAPER
OFF OVERNIGHT AS A STORM SYSTEM EXITS THE AREA AND AN UPPER LEVEL
RIDGE BEGINS TO BUILD OVER THE PACIFIC NW. ANOTHER SYSTEM WILL
ARRIVE MONDAY EVENING WITH MORE RAIN AND HIGH MOUNTAIN SNOW. FOR
TUESDAY INTO EARLY WEDNESDAY THE FORECAST AREA WILL BE IN AN
UNSEASONABLY WARM SOUTHERLY FLOW REGIME WITH MAINLY DRY CONDITIONS
EXCEPT FOR A FEW MOUNTAIN SHOWERS. THERE WILL BE THE POTENTIAL FOR
ADVISORY LEVEL WINDS IN THE LOWER ELEVATIONS TUESDAY INTO AT LEAST
EARLY WEDNESDAY. ON WEDNESDAY THE GFS PUSHES A COLD FRONT ACROSS THE
REGION BEGINNING A DRY NORTHERLY FLOW OF CANADIAN AIR AND MUCH
COOLER TEMPERATURES THURSDAY THROUGH SATURDAY. THE ECMWF ON THE
OTHER HAND KEEPS THE REGION UNDER WARM SOUTHERLY FLOW THROUGH THE
PERIOD WITH A CHANCE FOR SHOWERS. FOR THIS FORECAST TRENDED TOWARD
THE GFS ON TEMPERATURES AND POPS BUT NOT COMPLETELY GIVEN THE MODEL
UNCERTAINTIES. 78

&&

.AVIATION...12Z TAFS...IFR CONDITIONS IN FOG ARE EXPECTED AT KYKM
AND KPSC THIS MORNING. CONDITIONS SHOULD IMPROVE LATER THIS MORNING
AS WINDS INCREASE. RAIN WILL TAPER OFF EARLY THIS MORNING BUT PICK
UP AGAIN BY MIDDAY MAINLY ACROSS OREGON. CONDITIONS SHOULD REMAIN
MOSTLY VFR BUT COULD BRIEFLY BE MVFR IN THE RAIN/RAIN SHOWERS. RAIN
WILL TAPER OFF BY EARLY EVENING WITH SOME PARTIAL CLEARING
OVERNIGHT. WINDS WILL VARY IN STRENGTH AT THE TAF SITES BUT WILL BE
STRONGEST AT KPDT...KALW...AND KPSC WITH SW-W WIND OF 15-30 KTS INTO
THIS EVENING 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  48  35  47  34 /  40  20  30  20
ALW  48  37  47  35 /  40  20  30  20
PSC  46  36  49  34 /  20  20  30  10
YKM  46  29  46  31 /  20  20  30  10
HRI  46  36  49  33 /  30  20  30  10
ELN  42  29  44  28 /  30  20  30  10
RDM  46  27  45  27 /  60  30  20  10
LGD  44  32  39  31 /  70  50  60  30
GCD  46  28  41  22 /  70  40  40  30
DLS  44  36  47  35 /  50  30  40  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.

&&

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

$$

94/78/78





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