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100
FXUS66 KPDT 260348
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
745 PM PST TUE NOV 25 2014

.SHORT TERM...BUILDING UPPER RIDGE IS PUSHING MOISTURE STREAM
NORTHWARD THIS EVENING. STILL SOME RAIN OVER THE WASHINGTON CASCADES
AND BLUES HOWEVER EXPECT THIS TO DIMINISH OVERNIGHT. SATELLITE
SHOWING BREAKS IN THE CLOUD COVER. SHOULD BE PARTLY TO MOSTLY CLOUDY
TONIGHT. SOME PATCHY FOG OR LOW CLOUDS POSSIBLE. RIDGE WILL BRING A
PARTLY SUNNY DAY WEDNESDAY WITH MILD TEMPERATURES. AN UPPER TROUGH
APPROACHING THE PACIFIC NORTHWEST THURSDAY WILL RESULT IN INCREASING
CLOUDS AND A CHANCE FOR SOME LIGHT RAIN. MORE WIDESPREAD RAIN ON
FRIDAY AS THE TROUGH MOVES INTO THE AREA. MODELS STILL BRING A
STRONG COLD FRONT THROUGH FRIDAY NIGHT WITH MUCH COLDER TEMPS FOR
THE WEEKEND.  94

&&

.PREV DISC... /ISSUED 305 PM PST TUE NOV 25 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY...MOISTURE PLUME COMING OVER
THE RIDGE OF HIGH PRESSURE CONTINUES TO IMPACT THE CENTRAL
WASHINGTON CASCADES AND THE NORTHERN BLUE MOUNTAINS WITH STEADY
RAIN. UPWARDS OF 2.5 INCHES OF RAIN HAVE FALLEN IN PARTS OF
NORTHEAST OREGON AND SOUTHEAST WASHINGTON WHILE 2 TO 3 INCHES HAVE
OCCURRED ACROSS PORTIONS OF THE EAST SLOPES OF THE WASHINGTON
CASCADES. SMALL CREEKS AND STREAMS HAVE SEEN SIGNIFICANT FLOW
INCREASES BUT THE MAIN STEM RIVERS CONTINUE TO RUN WELL BELOW
BANKFULL...EXCEPT FOR THE NACHES RIVER NEAR CLIFFDELL WHERE THE
RIVER IS EXPECTED TO CREST AROUND BANKFULL BY WEDNESDAY MORNING.
RATE RAINS ARE ON THE DOWNTREND AS THE MOISTURE PLUME HAS BEGUN TO
LIFT NORTHWARD AND WILL BE OUT OF THE FORECAST AREA BY LATER
TONIGHT...EXCEPT FOR SOME RAIN STILL ALONG THE CENTRAL WASHINGTON
CASCADES. THIS IS DUE TO THE HIGH PRESSURE RIDGE OFF THE COAST
BEGINNING TO MOVE INLAND AND WILL REMAIN OVER THE AREA THROUGH
WEDNESDAY. THE RIDGE WILL BEGIN TO FLATTEN HEADING INTO THURSDAY
WHICH WILL BRING SOME MOISTURE BACK OVER THE FORECAST AREA THROUGH
FRIDAY ONCE AGAIN INCREASING THE CHANCE OF PRECIPITATION. SNOW
LEVELS WILL REMAIN HIGH THROUGH FRIDAY SO NO SIGNIFICANT SNOW
EXPECTED FOR PASS LEVELS OR BELOW. TEMPERATURES WILL CONTINUE TO BE
MILD BOTH DAY AND NIGHT THROUGH FRIDAY.

LONG TERM...FRIDAY NIGHT THROUGH MONDAY NIGHT...COLDER AIR WILL
BEGIN TO MOVE SOUTH ACROSS WASHINGTON AND NORTHERN OREGON FRIDAY
NIGHT AND THEN DOWN INTO CENTRAL OREGON BY LATE SATURDAY. THE BAND
OF PRECIPITATION WILL MAINLY BE OVER OREGON WITH RAIN TURNING TO
SNOW AS THE COLD AIR MOVES SOUTH. BY SUNDAY ALL PRECIPITATION ACROSS
THE REGION WILL BE SNOW. A LOW PRESSURE SYSTEM OFF THE CALIFORNIA
COAST WILL THEN LIFT A WARM FRONT OVER THE AREA SUNDAY NIGHT INTO
MONDAY. THIS WILL LEAD TO PRECIPITATION CHANGING FROM SNOW TO RAIN
EARLY MONDAY OVER CENTRAL OREGON AND THEN OVER THE REST OF THE AREA
AS THE WARM FRONT LIFTS NORTHWARD DURING THE DAY. THERE COULD BE A
POTENTIAL FOR SOME BRIEF FREEZING RAIN OR SLEET DURING THE
TRANSITION PERIOD BUT WILL LEAVE OUT OF THE FORECAST FOR NOW DUE TO
THE UNCERTAINTY OF HOW FAST THE COLD AIR WILL EXIT THE REGION. A
TROUGH OF LOW PRESSURE WILL THEN SWING PAST THE AREA TO THE NORTH
AND A RIDGE OF HIGH PRESSURE WILL BUILD OFF THE WEST COAST FOR A
TRANSITION TO A COOL NORTHWEST FLOW OVER THE AREA MONDAY NIGHT INTO
THE MIDWEEK. DMH

AVIATION...00Z TAFS...MVFR CONDITIONS WITH OCCASIONAL IFR
CONDITIONS AT KYKM AND KALW ARE POSSIBLE TONIGHT WITH LOW CEILINGS
AND VISIBILITY DUE TO MIST. ELSEWHERE...CONDITIONS WILL BE MAINLY
VFR. RAIN THIS AFTERNOON WILL END NEAR KPSC AND KALW THIS EVENING.
WINDS WILL OCCASIONALLY BE GUSTY THIS EVENING AND OVERNIGHT WITH
GUSTS TO 25 KTS POSSIBLE. DMH

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  59  49  60 /  10   0  10  10
ALW  41  60  53  60 /  20   0  10  10
PSC  40  58  49  59 /  10   0  10  10
YKM  37  54  42  53 /  10  10  20  10
HRI  40  60  49  60 /  10   0  10  10
ELN  36  52  42  52 /  20  10  20  20
RDM  36  58  39  58 /   0   0  10  10
LGD  40  52  43  52 /  30   0  10  20
GCD  37  53  43  55 /  10   0  10  10
DLS  46  59  49  60 /  10  10  10  20

&&

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

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

$$

94






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