Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 241100
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 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

&&

.PREVIOUS AVIATION DISCUSSION...06Z TAFS...KEPT ALL TAF SITES WITH
PREVAILING VFR CONDITIONS THROUGH THE PERIOD. ONLY CAVEAT WILL BE
THE POTENTIAL FOR SOME LOW CLOUDS AND/OR MIST TO FORM MAINLY AFTER
24/9-12Z THROUGH 24/18Z AT SEVERAL TAF SITES. ATMOSPHERIC PARAMETERS
ARE MARGINAL FOR THIS TO OCCUR...THEREFORE FOR THE TIME BEING
INTRODUCED ONLY FEW OR SCT LOW CLOUDS TO THE AFFECTED TAF SITES.
OTHERWISE GENERALLY QUIET WEATHER IS EXPECTED INTO EARLY MONDAY
AFTERNOON. AFTER 25/00Z ANOTHER SYSTEM APPROACHES THE AREA WITH A
MID-LEVEL CLOUD DECK BETWEEN 4-8KFT AGL AND -SHRA BECOMING POSSIBLE.
WINDS ARE FORECAST TO DECREASE BELOW 10KTS AT KPDT BY 24/12Z AND ARE
FORECAST TO REMAIN AOB 10KTS AT ALL OTHER TAF STATIONS THROUGH
25/00Z. AFTER 25/00Z WINDS WILL BEGIN TO INCREASE OUT OF THE SOUTH
AT MOST TAF SITES. 77

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  53  43  58  44 /  10  40  30  10
ALW  53  44  58  47 /  10  40  40  10
PSC  51  41  57  46 /  10  40  30  10
YKM  46  37  52  39 /  10  40  30  10
HRI  54  43  59  45 /  10  40  30  10
ELN  45  35  50  38 /  10  50  40  30
RDM  50  40  59  34 /  10  30  20   0
LGD  46  42  51  37 /  10  60  60  30
GCD  47  34  53  33 /  10  40  30  20
DLS  50  42  56  43 /  10  40  40  10

&&

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

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

$$

94/99/99








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