Weather Service Report


941 
FXUS66 KPDT 280436 AAA
AFDPDT

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

.UPDATE...HIGH PRESSURE CONTINUES TO DOMINATE THE AREAS WITH MOSTLY 
CLEAR SKIES AND SOME BREEZY CONDITIONS WERE AT ELN. OVERNIGHT 
TEMPERATURES APPEAR IN THE BALL PARK AND THE PRESENT SHORT TERM 
FORECAST APPEARS ON TRACK FOR NOW.

&&

.AVIATION...VFR CONDITIONS WILL PERSIST FOR THE NEXT 24 HOURS ACROSS 
ALL TAF SITES.

&&

.PREV DISC... /ISSUED 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 

&&

.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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