Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 022109
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
209 PM PDT WED SEP 2 2015

.SHORT TERM...TONIGHT THROUGH SATURDAY...A SLOW MOVING COLD FRONT
WILL CONTINUE TO MOVE THROUGH THE EASTERN PORTION OF THE FORECAST
AREA OVERNIGHT AND EXIT INTO IDAHO EARLY THURSDAY. MEANWHILE...THE
UPPER LEVEL LOW PRESSURE OVER CENTRAL BRITISH COLUMBIA WILL CONTINUE
TO SLOWLY DROP SOUTHWARD. BY THURSDAY AFTERNOON IT WILL SETTLE OVER
THE PUGET SOUND AREA OF NORTHWEST WASHINGTON. THIS WILL INCREASE THE
INSTABILITY OVER WESTERN WASHINGTON AND THE CASCADE REGION. EXPECT
MAIN CHANCE OF RAIN SHOWERS THURSDAY TO OCCUR ALONG THE WASHINGTON
CASCADE EAST SLOPES ALONG WITH A SLIGHT CHANCE OF THUNDERSTORMS. THE
LOW WILL CONTINUE DROPPING SOUTH AND WILL BE OVER WESTERN OREGON ON
FRIDAY THEN SWING INLAND OVERNIGHT AND SATURDAY INTO EASTERN OREGON.
MODELS ALL AGREE THAT DURING THIS TIME THERE COULD BE SOME
SIGNIFICANT PRECIPITATION BUT DIFFER IN LOCATION AND TIME. HAVE
INCREASED CHANCE OF PRECIPITATION WITH THE IDEA OF THIS
TRANSITIONING ACROSS EASTERN OREGON STARTING IN CENTRAL OREGON
FRIDAY AFTERNOON AND EVENING THEN SHIFTING EAST AND NORTH OVERNIGHT
AND SATURDAY. PRECIPITATION ACCUMULATIONS ACROSS EASTERN OREGON AND
SOUTHEAST WASHINGTON COULD BE AROUND A QUARTER TO HALF AN INCH WITH
SOME MOUNTAINOUS LOCATIONS RECEIVING UP TO AN INCH. TEMPERATURES
WILL CONTINUE TO RUN BELOW NORMAL THROUGH SATURDAY AND ELEVATIONS
ABOVE 6500 FEET COULD SEE A DUSTING OF SNOW.


.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...MODELS IN GOOD
AGREEMENT ON MOVING UPPER LEVEL LOW PRESSURE AREA INTO IDAHO AND
MONTANA SATURDAY NIGHT AND SUNDAY.  SOME WRAPAROUND MOISTURE WILL
AFFECT MAINLY WALLOWA COUNTY INTO SUNDAY.  MODELS ALSO SHOW A WEAK
DISTURBANCE IN THE SUCCEEDING NORTHWEST FLOW THAT MAY CLIP THE
NORTHERN BLUES ON MONDAY.  THE REST OF THE AREA WILL EXPERIENCE A
RATHER DRY WEST-NORTHWEST FLOW INTO WEDNESDAY.  TEMPERATURES WILL
RECOVER TO AROUND NORMAL FOR TUESDAY AND WEDNESDAY.

&&

.AVIATION...00Z TAFS...MOIST WESTERLY FLOW INTO THE CASCADES WILL
BRING A FEW SHOWERS TO KDLS...BUT REST OF TAF SITES SHOULD SEE
CLOUDS DECREASING TO SCT AOA 10K.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  47  69  44  70 /  10   0   0  10
ALW  53  70  50  73 /  10   0  10  10
PSC  50  73  46  76 /   0   0   0  10
YKM  44  67  44  71 /  10  20  20  10
HRI  49  72  46  74 /  10   0   0  10
ELN  45  69  45  72 /  10  20  20  10
RDM  36  66  34  63 /  10  10  10  40
LGD  44  67  37  70 /  30  10  10  20
GCD  43  71  36  67 /  20  10  10  30
DLS  53  72  51  75 /  20  10  10  20

&&

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

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

$$

91/79/79


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