Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 242032
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
132 PM PDT SUN MAY 24 2015

.SHORT TERM...TODAY THROUGH WEDNESDAY...AN UPPER LEVEL LOW OVER
SOUTHERN BRITISH COLUMBIA WILL MOVE EAST TONIGHT...THEN SOUTHEAST
MONDAY THROUGH WEDNESDAY. AS THE LOW MOVES EAST TONIGHT WEST TO
NORTHWEST FLOW WILL BE OVER SOUTHEAST WASHINGTON AND EASTERN OREGON.
THIS WILL BRING DRIER AIR TO THE AREA. ONSHORE SURFACE FLOW WILL
KEEP WINDY CONDITIONS THROUGH THE CASCADE GAPS, PARTICULARLY THE
GORGE AND KITTITAS VALLEY.

CU HAS DEVELOPED FROM CENTRAL TO NORTHEAST OREGON AND ALONG THE
CASCADES. THE BEST INSTABILITY WILL BE IN THE DIFLUENT FLOW AHEAD OF
THE LOW IN THE NORTHERN BLUES AND CLOSE TO THE LOW ALONG THE WA
CASCADES WHERE A FEW SHOWERS HAVE ALREADY DEVELOPED. THESE SHOWERS
AND THUNDERSTORMS WILL DIE OFF OVERNIGHT, THEN REDEVELOP MONDAY
AFTERNOON. A FEW SHOWERS MAY PERSIST IN THE MOUNTAINS OVERNIGHT.  AS
THE LOW MOVES INTO EASTERN WASHINGTON TUESDAY AFTERNOON/EVENING A
WEAK WAVE WILL ROTATE AROUND THE LOW AND ENHANCE SHOWERS IN
SOUTHEAST WA, THE LOWER COLUMBIA BASIN, AND NORTHEAST OREGON.
WEDNESDAY WRAP AROUND MOISTURE AND INSTABILITY MAY TRIGGER SHOWERS
AND AFTERNOON THUNDERSTORMS ACROSS THE ENTIRE CWA. COONFIELD

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...AN UPPER LOW WILL MOVE
OUT OF THE AREA ON WEDNESDAY NIGHT AND MOUNTAIN SHOWERS WILL
DIMINISH. THEN ON THURSDAY A HIGH PRESSURE RIDGE WILL BUILD OVER THE
REGION...BUT RESIDUAL MOISTURE AND ENERGY COULD STILL ALLOW SHOWERS
OT THUNDERSTORMS TO DEVELOP OVER THE WASHINGTON CASCADES AND THE
NORTHEAST MOUNTAINS DURING THE AFTERNOON. ON FRIDAY THE RIDGE WILL
SHIFT EASTWARD AND WEAKEN...AND A WARM FRONT WILL POSITION ITSELF
ACROSS NORTHEAST WASHINGTON AND EXTEND DOWN THROUGH IDAHO. SOUTHWEST
FLOW WILL THEREFORE BE OVER THE LOCAL AREA AND SHOWERS OR
THUNDERSTORMS COULD AGAIN DEVELOP OVER CENTRAL OREGON...THE
CASCADES...OR THE NORTHEAST MOUNTAINS. THIS WEST-SOUTHWEST FLOW WILL
PERSIST ON SATURDAY AND SUNDAY AND A SHORTWAVE COULD BRING A GREATER
AND MORE WIDESPREAD CHANCE FOR SHOWERS AND THUNDERSTORMS BOTH DAYS.
DESPITE THE UNSETTLED WEATHER...TEMPERATURES WILL BE ABOVE NORMAL
THROUGH THE PERIOD WITH A GRADUAL WARMING TREND BRINGING DAYTIME
HIGHS INTO THE UPPER 70S TO LOWER 90S. COBB



&&

.AVIATION...


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  52  76  50  75 /  10  10  10  30
ALW  55  77  55  77 /  10  10  10  30
PSC  54  82  54  83 /  10  10  10  20
YKM  54  79  53  79 /  20  10  20  30
HRI  53  79  51  79 /  10  10  10  10
ELN  53  77  53  80 /  20  10  20  40
RDM  41  74  38  75 /  10  10  10   0
LGD  47  72  46  71 /  20  20  20  20
GCD  44  75  42  74 /  10  20  20  20
DLS  55  76  54  82 /  10  10  10  20

&&

.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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