Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 171117 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
417 AM PDT THU APR 17 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH FRIDAY NIGHT. FAIRLY STRONG UPPER LEVEL
TROUGH AND COLD FRONT WILL MOVE ACROSS THE REGION TODAY. RADAR
SHOWING RAIN IS INCREASING WEST OF THE CASCADES EARLY THIS MORNING.
AS THE UPPER TROUGH PUSHES THE COLD FRONT THROUGH THE FORECAST AREA
EXPECT ALL LOCATIONS TO RECEIVE A PERIOD OF RAIN. CLOUD COVER LOOKS
PRETTY SOLID FOR TODAY AND HAVE LOWERED MAX TEMPERATURES A FEW
DEGREES...MOSTLY IN THE 50S. AS THE SYSTEM MOVES OFF TO THE EAST
PRECIPITATION WILL DIMINISH LATER THIS EVENING AND OVERNIGHT WITH
GRADUAL CLEARING. COLD ADVECTION AND INCREASING SURFACE GRADIENTS
WILL RESULT IN BREEZY WEST WINDS TONIGHT INTO FRIDAY. A DRY WESTERLY
FLOW ALOFT FRIDAY WILL BRING PARTLY CLOUDY SKIES.  94

.LONG TERM...SATURDAY THROUGH WEDNESDAY...THE UPPER LEVEL RIDGE WILL
MOVE THROUGH EASTERN WASHINGTON AND OREGON SATURDAY MORNING.
SOUTHWEST FLOW WILL SET UP BEHIND THE RIDGE. LOW LEVELS WILL REMAIN
DRY UNTIL A NEW MOISTURE SOURCE ARRIVES DUE TO PREVIOUS SUBSIDENCE
FROM THE RIDGE...SO PRECIPITATION CHANCES ARE LOW THROUGH SUNDAY
NIGHT...EXCEPT ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES. BY
MONDAY A LOW PRESSURE SYSTEM OFF THE COAST WILL SPIN UP MOISTURE
WITH THE SOUTHWEST FLOW...INCREASING POPS ALONG THE NORTHEAST
MOUNTAINS...AND BRINGING A SLIGHT CHANCE ACROSS THE LOWER
ELEVATIONS. BY MONDAY EVENING SHOWERS WILL BECOME LIKELY ALONG THE
NORTHEAST MOUNTAINS. AS THE LOW MOVES OVER THE FORECAST AREA ON
TUESDAY THERE WILL STILL BE A CHANCE FOR SHOWERS...BUT EXPECT
TEMPERATURES TO COOL OFF WITH THE COLD FRONTAL PASSAGE. OVERALL
TEMPERATURES IN THE EXTENDED WILL START OUT IN THE UPPER 60S TO
LOWER 70S ACROSS THE LOWER ELEVATIONS...WITH 50S TO LOWER 60S
MOUNTAINS. THESE TEMPERATURES WILL INCREASE A DEGREE OR TWO EACH
DAY...UNTIL THE COLD FRONT PUSHES THROUGH ON TUESDAY. THEN THE
TEMPERATURES ACROSS THE LOWER ELEVATIONS WILL BE BACK IN THE LOWER
TO MID 60S...WITH UPPER 40S TO UPPER 50S MOUNTAINS. COONFIELD

&&

.AVIATION...12Z...VFR CONDITIONS WILL BECOME AREAS OF MVFR BY 15Z AS
A STORM SYSTEM MOVES ACROSS EASTERN WASHINGTON AND OREGON TODAY.
LOCAL IFR CONDITIONS POSSIBLE. AFTER 22Z SFC WIND GUSTS TO 30 KTS
ARE POSSIBLE. CLEARING WILL START NEAR KYKM AFTER 22Z AND SPREAD
EAST. ALL AREAS VFR AFTER 04Z.  76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  41  60  35 /  70  80  10   0
ALW  58  44  61  38 /  70  80  10   0
PSC  59  43  65  35 /  70  60  10   0
YKM  57  36  63  34 /  70  20  10   0
HRI  59  41  64  33 /  70  70  10   0
ELN  55  38  60  33 /  70  30  10   0
RDM  57  27  61  27 /  70  30  10   0
LGD  58  39  57  33 /  60  80  20   0
GCD  58  35  58  30 /  60  70  10   0
DLS  58  43  64  37 /  70  30  10   0

&&

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

THREAT INDEX
TODAY : GREEN
FRIDAY : GREEN
SATURDAY : GREEN

GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.

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

$$

94/76/76






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