Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 261113 AAA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
415 AM PDT SUN APR 26 2015...UPDATED

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH TUESDAY...A NORTHWEST FLOW WILL EXIST
OVER THE REGION THIS MORNING AHEAD OF BUILDING UPPER RIDGE THAT IS
STILL OFF THE COAST. SKIES HAVE BECOME MOSTLY CLEAR WITH LIGHT WINDS
AND STRONG RADIATIONAL COOLING. SOME LOCATIONS WILL HAVE NEAR OR
BELOW FREEZING TEMPERATURES THIS MORNING...NAMELY THE YAKIMA AND
KITTITAS VALLEYS AS WELL AS NORTH CENTRAL OREGON. THESE AREAS HAVE A
FREEZE WARNING THIS MORNING UNTIL 9 AM. TODAY THE UPPER RIDGE OFF
THE COAST WILL BUILD INTO THE PACIFIC NORTHWEST CAUSING A WARMING
TREND TO TAKE PLACE BEGINNING TODAY AND CONTINUING FOR THE NEXT FEW
DAYS. MAXIMUM TEMPERATURE READINGS TODAY WILL BE IN THE 50S AND 60S
IN THE LOWER ELEVATIONS WHICH WILL WARM TO THE MID AND UPPER 70S BY
TUESDAY. SOME AREAS ON TUESDAY COULD APPROACH 80 DEGREES IN THE
LOWER ELEVATIONS. WINDS WILL GENERALLY BE LIGHT TODAY AND MONDAY BUT
THEY WILL INCREASE FROM THE WEST ON TUESDAY...ESPECIALLY IN THE
KITTITAS VALLEY AND THE EASTERN COLUMBIA RIVER GORGE AS THE NEXT
COLD FRONT APPROACHES THE CWA FROM THE WEST. 88

.LONG TERM...TUESDAY NIGHT THROUGH SATURDAY.  OVERALL CONFIDENCE IN
THE EXTENDED FORECAST IS FAIR...AS RUN-TO-RUN CONTINUITY OF THE
DETERMINISTIC MODELS HAS A LOT TO BE DESIRED.  WINDS ON TUESDAY
NIGHT THROUGH WEDNESDAY WILL LIKELY BE 15-30 MPH FOR MOST OF THE
AREA...AND IT`S POSSIBLE THAT WIND ADVISORIES MAY BE NEEDED FOR THE
KITTITAS VALLEY AND THE GRANDE RONDE VALLEY.  MODELS IN GENERAL
AGREEMENT THAT AN UPPER LEVEL TROUGH WILL POSITION OVER WA/OR
WEDNESDAY FOR COOLER AND UNSTABLE CONDITIONS.  PER DISCUSSION WITH
SURROUNDING OFFICES...I WILL HOLD OFF MENTIONING THUNDERSTORMS FOR
THE CASCADES BUT A SLIGHT CHANCE MAY NEED TO BE ADDED IF MODELS
CONTINUE TO ADVERTISE THE COLD UPPER LOW SIMILAR TO THE LATEST RUNS.
AFTER THE PASSAGE OF THE UPPER LEVEL TROUGH...THE FORECAST AREA WILL
BE INFLUENCED BY A W-NW FLOW ALOFT AND SEVERAL EMBEDDED WAVES.
EXPECT OCCASIONAL SHOWERS...MAINLY OVER THE MOUNTAINS...AND
OCCASIONALLY BREEZY WINDS.  WISTER

&&

.AVIATION...12Z TAFS.  CLOUDS WILL INCREASE AS THE DAY PROGRESSES
WITH BKN-OVC CIGS MAINLY AOA 8,000 FEET AGL. WINDS WILL BE LESS THAN
15 KNOTS THROUGH THE PERIOD.  WISTER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  39  68  45 /   0   0   0   0
ALW  61  43  71  50 /   0   0   0   0
PSC  64  41  73  46 /   0   0   0   0
YKM  63  40  71  45 /   0   0  10   0
HRI  63  39  73  45 /   0   0   0   0
ELN  63  38  71  42 /   0  10  10   0
RDM  61  32  75  38 /   0   0   0   0
LGD  56  36  67  43 /   0   0   0   0
GCD  58  36  73  42 /   0   0   0   0
DLS  67  42  77  47 /  10  10   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FREEZE WARNING UNTIL 9 AM PDT THIS MORNING FOR ORZ510.

WA...FREEZE WARNING UNTIL 9 AM PDT THIS MORNING FOR WAZ026-027.

&&

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

$$

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