Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 300314
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
815 PM PDT FRI AUG 29 2014

.SHORT TERM...TONIGHT THROUGH SATURDAY...A COLD FRONT IS MOVING
ACROSS THE FORECAST AREA THIS EVENING WITH PLENTY OF CLOUDS BUT VERY
LITTLE PRECIPITATION. A SLIGHT CHANCE OF PRECIPITATION WILL CONTINUE
FOR THE EASTERN MOUNTAINS THROUGH ABOUT MIDNIGHT THEN THE FRONT WILL
BE EXITING THE FORECAST AREA WITH SOME PARTIAL CLEARING THROUGH
SATURDAY MORNING. BEHIND THE FRONT AN UPPER LEVEL TROUGH WILL BE
SETTLING OVER THE PACIFIC NORTHWEST. THIS WILL LOWER TEMPERATURES A
GOOD 10 TO 15 DEGREES FOR MOST OF THE FORECAST AREA ON SATURDAY.
EXPECT SOME BREEZY WESTERLY WINDS SATURDAY MAINLY IN THE AFTERNOON
AND EVENING. HAVE ADDED A SLIGHT CHANCE OF SHOWERS FOR THE EASTERN
MOUNTAINS FOR SATURDAY AFTERNOON AND EVENING AS MODELS INDICATING A
LITTLE MORE INSTABILITY AS THE UPPER LEVEL TROUGH MOVES OVER THE
REGION.


&&

.PREV DISC... /ISSUED 230 PM PDT FRI AUG 29 2014/

SHORT TERM...TONIGHT THROUGH MONDAY. AN UPPER LEVEL TROUGH WILL
MOVE ACROSS THE PACIFIC NORTHWEST TONIGHT INTO SATURDAY. A WEAK
FRONTAL BOUNDARY ASSOCIATED WITH THE UPPER TROUGH WILL MOVE THROUGH
TONIGHT. THIS WILL RESULT IN MOSTLY CLOUDY SKIES...WITH A FEW
SHOWERS OVER THE CASCADES AND BLUES. PARTLY CLOUDY ON SATURDAY AND
MUCH COOLER. HIGH TEMPS WILL BE DOWN 5-10 DEGREES FROM TODAY. BREEZY
WESTERLY WINDS AGAIN ESPECIALLY IN THE COLUMBIA BASIN AND KITTITAS
VALLEY. THE FORECAST AREA WILL REMAIN IN A NORTHWEST FLOW ALOFT
SUNDAY AND MONDAY. MODELS INDICATE ANOTHER SHORT WAVE MOVING THROUGH
SUNDAY AFTERNOON INTO THE OVERNIGHT PERIOD. THIS WILL BRING A RETURN
TO MOSTLY CLOUDY SKIES WITH A CHANCE OF SHOWERS OVER THE MOUNTAINS.
TEMPERATURES WILL REMAIN CLOSER TO NORMAL SUN/MON WITH HIGHS MOSTLY
IN THE 70S.   94

LONG TERM...MONDAY NIGHT THROUGH FRIDAY...MONDAY NIGHT A ZONAL
NORTHWESTERLY FLOW WILL BE OVER THE AREA FOR FAIR AND DRY WEATHER
THROUGH TUESDAY MORNING. BY TUESDAY AFTERNOON, AN UPPER TROUGH WILL
SWING DOWN INTO BRITISH COLUMBIA AND EXTEND SOUTH INTO OUR AREA.
MOST OF THE ENERGY AND MOISTURE WILL REMAIN TO OUR NORTH BUT THERE
WILL BE A SLIGHT CHANCE OF SHOWERS ALONG THE WASHINGTON CASCADE
CREST. THE CENTRAL LOW WILL PUSH OFF TO THE EAST ON TUESDAY NIGHT
BUT THE TROUGH WILL REMAIN AND SLOWLY EVOLVE THROUGH THE REST OF THE
LONG TERM PERIOD. WITH A NORTHWEST FLOW OVER THE AREA, HAVE
CONTINUED TO HAVE A SLIGHT CHANCE OF SHOWERS OVER THE WASHINGTON
CASCADES THROUGH WEDNESDAY EVENING WHILE THE REST OF THE AREA
REMAINS DRY. BY THURSDAY, MODELS START DEVELOPING AN OFFSHORE LOW IN
THE BASE OF THE TROUGH AND FLOW TURNS MORE TO THE NORTHEAST AND
DRIES OUT FURTHER. DO NOT EXPECT ANY PRECIPITATION THURSDAY THROUGH
FRIDAY. TEMPERATURES WILL START OUT IN THE 70S AND LOWER 80S ON
TUESDAY, DROP TO THE UPPER 60S AND 70S WEDNESDAY THEN WARM A COUPLE
OF DEGREES EACH DAY ARRIVING AT THE LOWER TO MID 80S WITH 70S IN THE
MOUNTAINS ON FRIDAY. OVERNIGHT LOWS WILL REMAIN GENERALLY IN THE
UPPER 40S AND 50S, THOUGH COLDER MOUNTAIN LOCATIONS WILL BE IN THE
30S. PERRY

AVIATION...00Z TAFS...VFR CONDITIONS WILL BE PREVALENT FOR
THE NEXT 24 HOURS. A DISTURBANCE IS APPROACHING THE REGION AND
MOSTLY CLEAR SKIES ARE GIVING WAY TO INCREASING CIRRUS ABOVE 20000
FEET AGL. SCATTERED MID LEVEL CLOUDS ABOVE 7000 FEET AGL WILL BEGIN
MOVING INTO THE AREA AFTER 06Z TONIGHT AND WILL REMAIN THROUGH 00Z
TOMORROW. WINDS WILL CONTINUE AT 10 TO 20 KTS WITH HIGHER GUSTS TO
30 KTS THROUGH 04Z THIS EVENING. WINDS WILL DROP BELOW 15 KTS AROUND
05Z-07Z THIS EVENING AND WILL BEGIN TO INCREASE AGAIN AFTER 16Z
TOMORROW MORNING. AFTER 20Z, WINDS WILL REACH 15 TO 25 KTS WITH
GUSTS TO 30 KTS AT KDLS AND 10 TO 20 KTS WITH GUSTS TO 25 KTS AT
OTHER TAF SITES. PERRY

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  77  51  76 /   0  10  10   0
ALW  61  77  56  77 /   0  10  10  10
PSC  60  80  54  80 /   0  10  10   0
YKM  57  76  50  76 /   0  10  10  10
HRI  59  80  53  79 /   0  10  10   0
ELN  56  75  51  74 /  10  10  10  10
RDM  49  73  42  74 /   0  10  10  10
LGD  53  72  45  73 /  20  20  20  10
GCD  53  73  44  75 /  20  20  20  10
DLS  61  78  56  78 /  10  10  10  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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