Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 272129
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT WED AUG 27 2014

.SHORT TERM...TONIGHT THROUGH SATURDAY. DRY WESTERLY FLOW ALOFT WITH
CLEAR SKIES THIS EVENING AND TONIGHT. A WEAK SHORT WAVE WILL MOVE
ACROSS THE PACIFIC NORTHWEST THURSDAY. MOSTLY MID AND HIGH LEVEL
CLOUDS. TEMPERATURES WILL BE 3-8 DEGREES COOLER THAN TODAY WITH
INCREASING WESTERLY WINDS IN THE AFTERNOON. A LARGER UPPER LEVEL
TROUGH WILL MOVE INTO THE REGION FRIDAY AND SATURDAY. MAIN IMPACTS
FROM THIS SYSTEM WILL BE A SIGNIFICANT COOLING TREND. HIGH TEMPS BY
SATURDAY WILL BE IN THE 70S. OTHERWISE PARTLY CLOUDY SKIES WITH JUST
A CHANCE OF SHOWERS OVER THE CASCADES. 94


.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...MODELS SHOW A TROUGH
OVER THE AREA SATURDAY NIGHT BUT HAVE BACKED OFF ON THE EXTENT OF
PRECIPITATION OVER THE AREA AND CONFINE SHOWERS TO THE CASCADE CREST
REGION. HAVE DRIED OUT THE EASTERN MOUNTAINS AND KEPT RAIN SHOWERS
MAINLY ALONG THE WASHINGTON CASCADE CREST. THE TROUGH WILL MOVE OFF
TO THE EAST SUNDAY AND LEAVE US UNDER THE INFLUENCE OF A LARGE RIDGE
OF HIGH PRESSURE CENTERED OUT IN THE PACIFIC OCEAN. THIS WILL SEND A
DRY NORTHWEST FLOW OVER THE PACIFIC NW THROUGH MONDAY NIGHT. EXPECT
THERE WILL BE SOME UPSLOPE SHOWERS MAINLY IN THE WASHINGTON
CASCADES WHILE THE REST OF THE AREA WILL REMAIN DRY. BY TUESDAY
MODELS BEGIN TO SHOW ANOTHER TROUGH MOVING SOUTH OUT OF THE GULF OF
ALASKA. LATEST RUNS KEEP THE TROUGH FURTHER NORTH THAN EARLIER RUNS.
ON TUESDAY AND TUESDAY NIGHT THE FLOW TURNS WEST TO SOUTHWEST AS THE
TROUGH MOVES INTO BRITISH COLUMBIA. MODELS ARE NOT SHOWING MUCH
PRECIPITATION BUT HAVE CONTINUE TO HAVE A SLIGHT CHANCE OF SHOWERS
ALONG THE WASHINGTON CASCADE CREST. BY WEDNESDAY THE ECMWF HAS THE
TROUGH OVER THE CANADIAN ROCKIES WHILE THE SLOWER GFS HAS IT FURTHER
WEST OVER WESTERN BRITISH COLUMBIA. MODELS CONTINUE TO LOOK DRY FOR
OUR AREA AND HAVE FOLLOWED SUIT, THOUGH IF THE GFS IS RIGHT, THE
SOUTHWESTERLY FLOW MAY GENERATE SOME MOUNTAIN SHOWERS. TEMPERATURES
WILL GENERALLY BE IN THE UPPER 60S AND 70S, THOUGH BY TUESDAY A FEW
COLUMBIA BASIN LOCATIONS WILL WARM TO THE LOWER 80S. PERRY

&&

.AVIATION...00Z TAFS...VFR CONDITIONS ARE EXPECTED FOR THE NEXT 24
HOURS. SKIES WILL GENERALLY BE CLEAR THOUGH SOME HIGH CIRRUS ABOVE
20000 FEET AGL WILL BEGIN TO MOVE INTO THE AREA AFTER 10Z THIS
EVENING. WINDS WILL REMAIN BELOW 15 KTS LATE THIS AFTERNOON AND THIS
EVENING THOUGH KDLS MAY HAVE SOME GUSTS TO 25 KTS FROM 21Z-04Z.
WINDS WILL DROP BELOW 10 KTS AFTER 06Z THEN BEGIN INCREASING AFTER
17Z. AFTER 20Z, KDLS WILL REACH 15 TO 25 KTS WITH GUSTS TO 30 KTS
AND KPDT, KRDM AND KBDN WILL REACH 15 TO 20 KTS WITH GUSTS TO 25
KTS. OTHER TAF SITES WILL REMAIN BELOW 15 KTS. PERRY

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  61  89  56  83 /   0   0   0   0
ALW  64  88  61  83 /   0   0   0   0
PSC  62  91  58  86 /   0   0   0   0
YKM  59  87  56  80 /   0   0   0   0
HRI  61  90  57  85 /   0   0   0   0
ELN  58  84  55  78 /   0   0   0  10
RDM  52  87  47  81 /   0   0   0   0
LGD  53  86  49  82 /   0   0   0  10
GCD  52  87  49  83 /   0   0   0  10
DLS  63  87  59  81 /   0   0   0  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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