Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 222228
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
225 PM PST MON DEC 22 2014

.SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT. A SUBTLE WARM FRONT
WILL MOVE NORTH ACROSS THE REGION TONIGHT AND A SHOWER MAY DEVELOP
WITH ITS PASSAGE. MEANWHILE A RIDGE OF HIGH PRESSURE WILL BUILD INTO
THE REGION WITH MOSTLY DRY CONDITIONS EXPECTED TOMORROW. AS THE
RIDGE SLIPS EAST A LOW PRESSURE SYSTEM WILL APPROACH THE TWO STATE
AREA TUESDAY NIGHT WITH THE CHANCE FOR SHOWERS INCREASING OVER THE
WA/OR CASCADES WEDNESDAY MORNING. THE SHOWERS ARE FORECAST TO
MIGRATE FROM WEST TO EAST WEDNESDAY MOVING THROUGH OUR AREA WITH
INCREASING PCPN CHANCES EXPECTED. AS THE SHOWERS PUSH EAST COLDER
AIR WILL WORK ITS WAY INTO THE REGION AND SNOW LEVELS WILL DECREASE
LATE WEDNESDAY AFTERNOON. LIGHT SNOW COULD FALL OVER THE AREA
MOUNTAINS ABOVE 3500 FEET INTO WEDNESDAY EVENING IN A PERSISTENT
UPSLOPE FLOW. SOME ACCUMULATION IS POSSIBLE AND A SPS WILL BE
ISSUED ADVISING TRAVELERS OF THIS POTENTIAL. IN ADDITION PRESSURE
GRADIENTS TIGHTEN AND BREEZY WEST TO NORTHWEST WINDS COULD DEVELOP
WEDNESDAY NIGHT.

.LONG TERM...THURSDAY THROUGH MONDAY. SYSTEM WILL BE EXITING THE
REGION ON THURSDAY WITH SOME SNOW SHOWER LINGERING OVER THE
MOUNTAINS. FRIDAY SHOULD BE MAINLY DRY WITH NORTHWEST FLOW AHEAD OF
A SYSTEM TO MOVE THROUGH SATURDAY AND SUNDAY WITH A MIX OF RAIN AND
SNOW. THE ECMWF IS STRONGER WITH THE LOW PRESSURE AREA...KEEPING
MORE OF A NEGATIVE TILT BEFORE SWINGING THE LOW THROUGH, WHILE THE
GFS MINORS OUT THE LOW AND SWEEPS ACROSS MORE OF AN OPEN TROUGH.
FOLLOWING BOTH OF THESE SYSTEM THE FLOW BECOME NORTHERLY WITH COOLER
AIR MOVING SOUTH OVER THE AREA THROUGH EARLY NEXT WEEK. 93.

&&

.AVIATION...00Z TAFS. VFR CONDITIONS WILL BE PREVAIL OVERNIGHT AS
NORTHWEST FLOW CONTINUES OVER THE AREA WITH SOME CLOUDS BANKING UP
ALONG THE MOUNTAINS. THERE SHOULD BE SOME MID TO HIGHER LEVEL CLOUDS
MOVING INTO THE REGION OVERNIGHT AND SHOULD LESSEN THE CHANCE OF FOG
AND LOW CLOUD FORMATION.  WINDS WILL BE 5 TO 10 KTS OVERNIGHT. 93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  33  49  35  42 /  10  20  10  80
ALW  33  47  37  42 /   0  20  10  80
PSC  32  46  36  42 /  10  20  10  60
YKM  32  43  34  39 /  10  20  30  60
HRI  34  47  37  43 /  10  20  10  70
ELN  31  41  33  37 /  10  20  30  70
RDM  32  53  34  44 /  20  10  10  70
LGD  28  43  34  39 /  10  10  10  70
GCD  35  45  34  39 /  10  10  10  70
DLS  38  50  39  43 /  20  20  20  80

&&

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

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

$$

97/93/93





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