Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 292302
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
400 PM PDT FRI APR 29 2016

.SHORT TERM...TONIGHT THROUGH MONDAY AFTERNOON...A MID/UPPER LEVEL
DEFORMATION ZONE IN WIND FLOW PATTERN ALOFT ASSOCIATED WITH UPPER
LOW OVER IDAHO PANHANDLE AND WESTERN MONTANA THIS AFTERNOON WILL
CONTINUE TRIGGERING SHOWERS THROUGH THE REMAINDER OF THIS AFTERNOON
AND THIS EVENING ACROSS THE LOWER COLUMBIA BASIN EAST OF BENTON
CITY, MOST OF THE COLUMBIA BASIN IN OREGON, ALONG THE FOOTHILLS OF
THE BLUE MOUNTAINS, THE NORTHERN BLUE MOUNTAINS, THE WALLOWA
MOUNTAINS AND WALLOWA COUNTY. A WEAK MID/UPPER LEVEL SHORT WAVE WILL
CONTINUE TO MOVE TOWARD THE SOUTHEAST ACROSS CENTRAL OREGON THIS
AFTERNOON/EVENING AND THEN EXIT THE REGION BEFORE MIDNIGHT. AS SUCH
ISOLATED SHOWERS WILL BE POSSIBLE THIS AFTERNOON/EVENING IN CENTRAL
AND NORTH CENTRAL OREGON. OVERNIGHT POPS WILL DECREASE BELOW 15
PERCENT FOR MOST OF THE FORECAST AREA, BUT THE FAR NORTHEAST
MOUNTAINS OF OREGON AND THE NORTHERN BLUE MOUNTAINS WILL SEE
SCATTERED SHOWERS OVERNIGHT INTO SATURDAY MORNING. THEN DRY
CONDITIONS WILL PREVAIL THROUGH THE WEEKEND AND MONDAY DUE TO A
MID/UPPER LEVEL LONG WAVE RIDGE OF HIGH THAT BUILDS OVER PACIFIC
NORTHWEST.  POLAN

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY. THE PACIFIC NORTHWEST WILL
BE UNDER THE INFLUENCE OF A SLOW MOVING UPPER LEVEL LOW THROUGH THE
EXTENDED PERIOD. THE GFS HAS THE UPPER LOW APPROACHING THE COAST
TUESDAY THEN SLOWLY MOVING THROUGH THE AREA WEDNESDAY AND BECOMING
NEARLY STATIONARY OVER CALIFORNIA/NEVADA THURSDAY INTO FRIDAY. THIS
WILL MAINTAIN A PARTLY TO MOSTLY CLOUDY PATTERN WITH OCCASIONAL
SHOWERS AND THUNDERSTORMS. TUESDAY WILL BE THE WARMEST DAY WITH
HIGHS IN THE 70S TO MID 80S AS THE FLOW ALOFT IS SOUTHERLY AHEAD OF
THE LOW AND SKIES WILL BE PARTLY CLOUDY. WEDNESDAY WILL BE A LITTLE
COOLER AS MORE CLOUD COVER IS EXPECTED. BY THURSDAY AND FRIDAY
TEMPERATURES ALOFT WILL BE COOLING AND HIGHS WILL BE IN THE 60S TO
MID 70S.  94

&&

.AVIATION...00Z TAFS. SCATTERED SHOWERS WILL CONTINUE OVER THE TAF
SITES THROUGH THE EVENING. CEILINGS 040-080. CLOUDS WILL DIMINISH
LATER TONIGHT WITH SCT-BKN 040-080. WESTERLY WINDS 10-25KT. FOR
SATURDAY SCT 050-080. NORTHWEST WINDS 10-20KT.  94

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  43  68  45  74 /  20  10   0   0
ALW  46  69  48  76 /  20  10   0   0
PSC  45  75  46  80 /  20  10   0   0
YKM  42  76  44  81 /  20   0   0   0
HRI  43  73  43  78 /  20   0   0   0
ELN  42  73  43  78 /  20   0   0   0
RDM  30  66  33  74 /  20   0   0   0
LGD  40  62  41  72 /  40  10   0  10
GCD  38  63  38  71 /  40  10   0  10
DLS  46  74  46  82 /  20   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...WIND ADVISORY UNTIL 9 PM PDT THIS EVENING FOR WAZ026.

&&

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

$$

99/94/94



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