Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 241727 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
927 AM PST MON NOV 24 2014

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH TUESDAY...A RIDGE OF HIGH PRESSURE IS
BUILDING OVER THE EASTERN PACIFIC OCEAN. THIS WILL LIFT A WARM FRONT
OVER THE PACIFIC NORTHWEST STARTING LATE TODAY AND INTO TUESDAY. THE
MAIN SURGE OF MOISTURE ASSOCIATED WITH THIS WILL BE FOCUSED OVER
WASHINGTON AND NORTHERN OREGON...ESPECIALLY THE CASCADE MOUNTAINS
AND THE MOUNTAINS OF NORTHEAST OREGON/SOUTHEAST WASHINGTON. THESE
AREAS COULD SEE 1 TO 3 INCHES OF RAINFALL OVER THE NEXT 24 TO 36
HOURS WHILE LOWER ELEVATIONS AROUND THE BASIN WILL SEE A TENTH TO A
QUARTER OF AN INCH. THE FOOTHILLS OF THE BLUE MOUNTAINS WILL BE IN
BETWEEN WITH HALF AN INCH TO NEAR AN INCH. ALL THIS MEANS THAT AREA
STREAMS AND RIVERS WILL BE ON THE RISE. NO FLOODING IS EXPECTED AT
THIS POINT ON THE MAIN RIVERS BUT WILL NEED TO MONITOR THE SMALL
STREAMS AND CREEKS FEEDING THE MAIN RIVERS FOR RAPID RISES OVERNIGHT
AND INTO TUESDAY. SNOW LEVELS WILL INITIALLY BE AROUND 5000 FEET
LATE TODAY BUT WILL RISE RAPIDLY TO AROUND 8000 FEET ON TUESDAY. THE
WARM FRONT WILL ALSO BRING INCREASING WINDS OVERNIGHT AND TUESDAY
WHICH WILL AID IN BOOSTING TEMPERATURES.

&&

.AVIATION...18Z TAFS...VFR CONDITIONS ARE EXPECTED OVER THE NEXT 12
HOURS...WITH MVFR/IFR CONDITIONS TO FOLLOW FROM 06Z-18Z TUESDAY.
RAIN WILL BEGIN TO ENTER TAF SITES AFTER 3Z AND MAY PERSIST ON AND
OFF AT SOME TAF SITES THROUGH 18Z TOMORROW.  EXPECT POTENTIAL
MVFR/IFR CONDITIONS AS CIGS AND VISIBILITIES LOWER THIS EVENING AND
TUESDAY MORNING. WINDS WILL GENERALLY BE 5-15KTS. WEBER    WEBER
&&

.PREV DISC... /ISSUED 440 AM PST MON NOV 24 2014/

SHORT TERM...TODAY THROUGH WEDNESDAY. UPPER LEVEL RIDGE WILL BE
BUILDING OVER THE REGION TODAY AND REMAIN IN PLACE FOR SEVERAL DAYS.
AS THE RIDGE BUILDS IN IT WILL BE ACCOMPANIED BY A WARM FRONT. THIS
WILL BRING INCREASING CLOUDS DURING THE DAY. THERE WILL BE A PERIOD
OF RAIN AS THE FRONT MOVES THROUGH MAINLY THIS AFTERNOON AND
EVENING. SATELLITE SHOWS A GOOD STREAM OF MOISTURE MOVING OVER THE
TOP OF THE RIDGE AND THIS WILL ENHANCE RAINFALL TONIGHT INTO
TUESDAY. EXPECT SIGNIFICANT RAINFALL AMOUNTS OVER THE CASCADES AND
ALSO THE BLUES THROUGH TUESDAY AFTERNOON. THE AIRMASS WILL BE WARM
AND SNOW LEVELS WILL BE HIGH. THE MOISTURE STREAM WILL GET PUSHED
NORTHWARD TUESDAY NIGHT AND PRECIPITATION WILL END. PARTLY CLOUDY
SKIES EXPECTED FOR WEDNESDAY. TEMPERATURES WILL BE WARM THROUGH THE
PERIOD WITH HIGHS IN THE UPPER 40S AND 50S. WINDS WILL BE FAIRLY
LIGHT TODAY THEN INCREASE TONIGHT INTO TUESDAY NIGHT. SHOULD BE
BREEZY TO WINDY FOR MANY LOCATIONS.   94

LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...WEDNESDAY NIGHT A
LARGE MID/UPPER LEVEL PACIFIC TROUGH BETWEEN 140-150W AND A SECOND
TROUGH DIGGING SOUTH OVER BRITISH COLUMBIA SET THE STAGE FOR
INCREASING POPS IN MOUNTAINS ON THURSDAY. THESE TWO SYSTEMS COME
INTO PHASE WITH ONE ANOTHER TO USHER IN INCREASING MOISTURE AND
DYNAMIC LIFT ON FRIDAY. SNOW LEVELS LOWER FROM 5000-6000 FEET FRIDAY
TO 2000-4000 FEET FRIDAY NIGHT. OVER THE WEEKEND BOTH SYSTEMS MOVE
ACROSS PACIFIC NORTHWEST FOR A CHANCE OF MAINLY SNOW MIXED WITH SOME
RAIN DURING DAYTIME HOURS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  44  57  44 /  10  60  60  10
ALW  51  45  57  47 /  10  70  60  10
PSC  50  43  56  46 /  10  60  20  10
YKM  45  37  52  39 /  10  50  10  10
HRI  51  44  58  45 /  10  60  20  10
ELN  46  36  50  38 /  10  60  20  30
RDM  48  39  58  34 /  10  20  10   0
LGD  44  40  50  37 /  10  90  80  30
GCD  44  38  51  33 /  10  50  30  20
DLS  51  44  58  43 /  10  60  20  10

&&

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

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

$$

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