Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 230955
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
255 AM PDT SAT MAY 23 2015

.SHORT TERM...TODAY THROUGH SUNDAY NIGHT...THE BROAD UPPER TROUGH OF
LOW PRESSURE THAT HAS BEEN OVER THE WESTERN U.S. WILL GRADUALLY
WEAKEN AND SHIFT EAST TODAY THROUGH SUNDAY. THIS WILL RESULT IN A
GRADUAL INCREASE IN DRIER WEST TO NORTHWEST FLOW AT THE SURFACE AND
ALOFT. THUS WILL SEE A GRADUAL DECREASE IN MOISTURE LIMITING THE
DEVELOPMENT OF SHOWERS AND THUNDERSTORMS DURING MUCH OF THIS PERIOD.
ONE LAST GOOD AREA OF MOISTURE IS CURRENTLY MOVING THROUGH THE
REGION. SCATTERED TO LOCALLY NUMEROUS SHOWERS ARE OCCURRING WITHIN
THIS AREA OF MOISTURE. EXPECT A GOOD PORTION OF THE FORECAST AREA TO
BE AFFECTED BY SCATTERED SHOWERS THROUGH THIS MORNING. WILL SEE
ISOLATED TO SCATTERED SHOWERS PERSIST INTO THE AFTERNOON, BUT WILL
BEGIN TO SEE SOME AREAS DRY OUT. MAY BE ENOUGH INSTABILITY FOR A FEW
THUNDERSTORMS OVER SOUTH CENTRAL WASHINGTON AND OUR EASTERN MOUNTAIN
ZONES THIS AFTERNOON AND EVENING. OVERNIGHT WILL SEE THE SHOWERS
CONTINUE TO DECREASE WITH ONLY A FEW SHOWERS LINGERING OVER SOME
MOUNTAIN AREAS BY EARLY SUNDAY MORNING. DAYTIME HEATING SUNDAY
AFTERNOON WILL CAUSE A FEW SHOWERS AND STORMS TO DEVELOP OVER SOUTH
CENTRAL WASHINGTON AND THE EASTERN MOUNTAINS WHERE SOME MOISTURE
WILL LINGER. ANOTHER LOW WILL DROP INTO WASHINGTON FROM BRITISH
COLUMBIA LATE SUNDAY INTO SUNDAY NIGHT. THIS SYSTEM WILL KEEP A FEW
SHOWERS AND STORMS GOING DURING THE EVENING IN THE SAME LOCATIONS AS
IN THE AFTERNOON SUNDAY. ALSO A FEW SHOWERS MAY DRIFT INTO THE
FOOTHILLS AND THE WASHINGTON BASIN SUNDAY EVENING. TEMPS WILL REMAIN
NEAR TO SLIGHTLY ABOVE SEASONAL THROUGH THE PERIOD. 90

.LONG TERM...MONDAY THROUGH SATURDAY...SMALL UPPER LOW WILL DROP SWD
ACROSS WASHINGTON AND OREGON AND MEANDER ACROSS THE AREA INTO
THURSDAY BEFORE GETTING KICKED EWD AS ANOTHER WEAK TROUGH GETS
ESTABLISHED OFF THE NW COAST AT THE END OF THE WEEK. THE LOW IS NOT
FORECAST TO BE PARTICULARLY POTENT OR OVERLY MOIST WITH THE BEST
CHANCES FOR SHOWERS NEAR THE WASHINGTON CASCADES AND ALSO THE
NORTHEAST MOUNTAINS. THERE SHOULD BE ENOUGH INSTABILITY IN THESE
AREAS FOR ISOLATED AFTERNOON AND EVENING THUNDERSTORMS. FRIDAY LOOKS
TO BE MOSTLY DRY BUT BY SATURDAY A MORE SLY FLOW MAY RESULT IN AN
INCREASE IN SHOWERS/ISOLATED THUNDERSTORMS. TEMPERATURES WILL
CONTINUE TO BE WARM THROUGH THE PERIOD AND WARMING WITH TIME SO THAT
BY FRIDAY THE LOWER ELEVATIONS WILL SEE HIGHS IN THE MID AND UPPER
80S WITH 70S IN THE MOUNTAINS. LOWS WILL BE MOSTLY IN THE 50S WITH
40S IN THE MOUNTAINS.

&&

.AVIATION...12Z TAFS...VFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. EXPECT A DECREASING TREND IN THE SHOWERS THROUGHOUT
THE DAY TODAY. THERE WILL BE SCT-BKN CLOUDS AT 5-8 KFT WITH MID AND
HIGH CLOUDS ABOVE TODAY BUT THE LOWER CLOUDS WILL DECREASE BY THIS
EVENING. WINDS WILL BE MOSTLY WESTERLY AT AROUND 10 KT TODAY EXCEPT
15-25 KT AT KDLS. WINDS WILL DIMINISH TONIGHT AND GO TERRAIN DRIVEN
IN MOST LOCATIONS EXCEPT KDLS WHERE THEY WILL REMAIN WESTERLY AT 10-
20 KT. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  76  51  79  51 /  40  20  10  20
ALW  78  55  81  55 /  30  20  10  20
PSC  84  55  86  55 /  30  10  10  20
YKM  81  56  83  54 /  40  10  20  20
HRI  81  53  84  53 /  40  10  10  10
ELN  82  55  80  54 /  30  20  20  20
RDM  70  39  77  39 /  20  10  10  10
LGD  72  50  74  46 /  40  30  20  20
GCD  72  45  77  44 /  40  20  10  10
DLS  72  55  76  55 /  20  10  10  10

&&

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

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

$$

90/78/78



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