Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 211733 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1033 AM PDT TUE OCT 21 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...STRONG UPPER LEVEL TROUGH MOVING INTO IDAHO THIS
MORNING. SOME LINGERING LIGHT RAIN OVER THE BLUES AND WALLOWA COUNTY
FOR A FEW MORE HOURS. A MUCH WEAKER SHORT WAVE IS MOVING ACROSS THE
PACIFIC NORTHWEST TODAY. THIS WILL RESULT IN PARTLY TO MOSTLY CLOUDY
SKIES. SCATTERED SHOWERS MAINLY OVER THE CASCADES. COOLER AIRMASS
OVER THE REGION TODAY WITH HIGHS IN THE 50S AND 60S. 12Z MODELS
CONTINUE TO SHOW RAIN LIKELY WEDNESDAY INTO WEDNESDAY NIGHT. 94

&&

.AVIATION...18Z TAFS...VFR CONDITIONS SHOULD PREVAIL NEXT 24
HOURS...BUT MID AND HIGH CLOUDS CAN BE EXPECTED. CLOUDS WILL THICKEN
AND LOWER OVERNIGHT WITH NEXT WEATHER SYSTEM. RAIN COULD ARRIVE AT
KBDN...KDLS AND KYKM BY WEDNESDAY MORNING. WINDS WILL GENERALLY
REMAIN BELOW 12 KTS...EXCEPT FOR GUSTY SOUTH WINDS AT KBDN.  82

&&

.PREV DISC... /ISSUED 445 AM PDT TUE OCT 21 2014/

SHORT TERM...TODAY THROUGH THURSDAY...A COLD FRONT IS MOVING ACROSS
UNION AND WALLOWA COUNTY AT THIS TIME. THE FRONT WILL SLOWLY MOVE
EASTWARD AND EXIT THE AREA EARLY TODAY. RAIN WILL SHIFT EASTWARD
WITH THE FRONT. WITH THE FRONT EXITING THIS MORNING WILL SEE
SHOWERS ON THE DECREASE OVER FAR EASTERN OREGON TO JUST A SLIGHT
CHANCE BY AFTERNOON. REST OF THE FORECAST AREA WILL BE PARTLY CLOUDY
AND COOL FOLLOWING THE FRONTAL PASSAGE. RAIN WILL BE SLOW TO SPREAD
EASTWARD...AS THE UPPER LEVEL FLOW IS PARALLEL TO THE FRONT.
PRECIPITATION WILL EVENTUALLY DEVELOP OVER ALL AREAS BY WEDNESDAY
NIGHT. A COLD FRONT WITH THE SYSTEM WILL LOWER SNOW LEVELS DOWN TO
5500-6500 FEET ALONG THE CASCADES THURSDAY. RAIN SHADOWING WILL
DEVELOP IN THE COLUMBIA BASIN, AND YAKIMA AND KITTITAS VALLEYS
THURSDAY BEHIND THE FRONT. COONFIELD

LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...MOIST SOUTHWEST FLOW
AHEAD OF PACIFIC TROF WILL BRING PERIODS OF RAIN TO MAINLY THE
MOUNTAIN AREAS THURSDAY NIGHT THROUGH SATURDAY.  THE RAIN WILL
DECREASE SUNDAY AND MONDAY.  EC-GFS IN GOOD AGREEMENT UNTIL SUNDAY
WHEN EC DEVELOPS A RIDGE AND GFS STAYS WITH WEAK TROF AND FLAT
WESTERLY FLOW.  WITH THIS SLIGHT UNCERTAINTY WILL LEAVE A SMALL
CHANCE FOR PRECIPITATION IN THE MOUNTAINS FOR MONDAY AND TUESDAY.
BREEZY TO WINDY CONDITIONS WILL ACCOMPANY A FRONTAL PASSAGE ON
SUNDAY. NO SIGNIFICANT TEMPERATURE EXTREMES EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  65  45  69  53 /  10  10  40  70
ALW  65  48  68  53 /  10  10  40  70
PSC  67  49  67  53 /  10  10  50  60
YKM  63  44  59  45 /  10  30  70  70
HRI  67  43  66  51 /  10  10  50  70
ELN  63  45  60  45 /  10  60  80  80
RDM  60  40  66  46 /  10  10  50  80
LGD  60  41  64  50 /  40  10  20  50
GCD  60  40  64  48 /  20  10  20  50
DLS  65  48  62  52 /  10  30  70  80

&&

.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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