Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 110437
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
837 PM PST WED FEB 10 2016

.UPDATE...ANOTHER TRANQUIL WEATHER NIGHT IS IN STORE. FORECAST ON
TRACK AND ONLY MINOR UPDATES WERE MADE. PRECIPITATION HAS BEEN
REMOVED FOR THIS EVENING...AS DOPPLER RADAR IS SHOWING NO RETURNS
AT THIS TIME. HOWEVER...A CHANCE OF RAIN FOR THE EAST SLOPES OF
THE CASCADES AND A SLIGHT CHANCE OVER THE NORTHERN BLUE MOUNTAINS
REMAIN AFTER MIDNIGHT. DOPPLER RADARS AT PORTLAND AND SEATTLE ARE
SHOWING RAIN MAKING ITS WAY ONSHORE. OVERNIGHT TEMPERATURES IN
THE UPPER 20S TO UPPER 30S LOOK REASONABLE...BUT I DECREASED
TEMPERATURES IN SOME OF THE HIGHER MOUNTAIN LOCATIONS AS THE LOW
LEVEL INVERSION IS WEAKENING AND THE RIDGETOPS ARE COOLER THAN
THIS TIME LAST NIGHT. WISTER


&&



.PREV DISCUSSION... /ISSUED 348 PM PST WED FEB 10 2016/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...WEATHER CONDITIONS
THROUGH THIS PERIOD WILL BE UNSETTLED. AN UPPER RIDGE WILL REMAIN
OVER THE WESTERN U.S. THROUGH THURSDAY NIGHT. WEAK SYSTEMS WILL MOVE
INTO AND THROUGH THE RIDGE RESULTING IN VARYING CHANCES OF LIGHT
PRECIP. SNOW LEVELS WILL REMAIN HIGH, GENERALLY ABOVE 6000 FT MSL,
THROUGH THURSDAY NIGHT. THUS WILL ONLY SEE LIGHT SNOW ACCUMULATIONS
AT THE HIGHEST ELEVATIONS. FOG WILL BE LIMITED DUE TO THE VARYING
AMOUNTS OF CLOUD COVER AND SOME COOLING ALOFT TO WEAKEN THE LOW
LEVEL INVERSIONS. WILL ONLY MENTION FOG IN THE KITTITAS AND WALLOWA
VALLEYS LATE TONIGHT INTO THURSDAY MORNING. TEMPS WILL BE NEAR OR
SLIGHTLY BELOW 32 DEGREES IN THE KITTITAS VALLEY THURSDAY MORNING.
THUS THERE IS AN OUTSIDE CHANCE OF SOME LIGHT FREEZING RAIN. BREEZY
TO WINDY CONDITIONS WINDS WILL CONTINUE IN THE GRANDE RONDE VALLEY,
ESPECIALLY THE SOUTH END. ELSEWHERE WINDS WILL BE 15 MPH OR LESS.
WILL CONTINUE THE AIR STAGNATION ADVISORY AT THE LOWER ELEVATION
AREAS THROUGH AT LEAST FRIDAY, THOUGH THE INVERSIONS WILL BE
WEAKENING. A FRONTAL SYSTEM WILL MOVE THROUGH THE AREA FRIDAY
BRINGING CHANCES OF PRECIP TO MOST LOCATIONS. SNOW LEVELS WILL LOWER
BEHIND THE FRONT LATE FRIDAY AND FRIDAY NIGHT. MAY SEE SOME LIGHT
ACCUMULATIONS DOWN TO AROUND 4000 FT MSL LATE FRIDAY NIGHT. 90

LONG TERM...SATURDAY THROUGH WEDNESDAY...SATURDAY A WEAK SYSTEM
WILL MOVE THROUGH THE AREA WITH A CHANCE OF RAIN AND SNOW IN THE
MOUNTAINS AS SNOW LEVELS DROP TO AROUND 4000 FEET. SNOW AMOUNTS WILL
BE AN INCH OR TWO. THE LOWER ELEVATIONS SHOULD BE MOSTLY DRY ASIDE
FROM A SLIGHT CHANCE OF RAIN SHOWERS IN THE BLUE MOUNTAIN FOOTHILLS
AND PERHAPS THE YAKIMA AND KITTITAS VALLEYS. IN THE COLUMBIA BASIN
WINDS WILL PICK UP TO 10 TO 20 MPH IN THE AFTERNOON. SATURDAY NIGHT
AND SUNDAY ANOTHER STRONGER SYSTEM WILL MOVE THROUGH THE AREA WITH A
CHANCE OF RAIN ACROSS THE AREA. SNOW LEVELS WILL RISE TO 7000 FEET
BY SUNDAY SO MOST OF THE MOUNTAINS WILL JUST SEE RAIN. MODELS SHOW A
WARM FRONT LIFTING THROUGH THE AREA SUNDAY NIGHT WITH A CHANCE OF
RAIN IN THE MOUNTAINS AND A SLIGHT CHANCE IN THE LOWER ELEVATIONS.
AS THE FRONT MOVES NORTH A RIDGE WILL MOVE OVER THE AREA WITH DRYING
CONDITIONS AND VERY WARM TEMPERATURES ON MONDAY. THE RIDGE WILL PUSH
OFF TO THE EAST TUESDAY AS AN UPPER LOW AND TROUGH APPROACHES THE
WEST COAST. MODELS THEN BRING A FRONT INTO THE AREA LATE TUESDAY
NIGHT AND WEDNESDAY WITH A CHANCE OF MAINLY RAIN. SNOW LEVELS WILL
DROP TO 5500 FEET ON WEDNESDAY. TEMPERATURES WILL START OUT IN THE
UPPER 40S TO MID 50S WITH 40S IN THE MOUNTAINS SATURDAY AND SUNDAY.
MONDAY WILL SEE HIGH TEMPERATURES RISE TO THE LOWER TO MID 60S WITH
UPPER 40S AND 50S IN THE MOUNTAINS. TEMPERATURES WILL THEN COOL A
FEW DEGREES EACH DAY ON TUESDAY AND WEDNESDAY. PERRY

AVIATION...00Z TAFS...VFR CONDITIONS WILL BE PREVALENT OVER THE
NEXT 24 HOURS. A WEAK DISTURBANCE WILL BE MOVING ACROSS THE AREA
TONIGHT AND TOMORROW. THERE WILL BE INCREASING MID AND UPPER LEVEL
CLOUDS THIS EVENING BECOMING OVERCAST AT 5000-10000 FEET AGL TONIGHT
AND TOMORROW. PRECIPITATION WILL BE CONFINED MAINLY TO THE CASCADES
TONIGHT THEN SLOWLY MOVE EAST TOMORROW WITH RAIN REACHING KDLS AND
KYKM AFTER 16Z. RAIN WILL HOLD OFF AT OTHER TAF SITES UNTIL AFTER
00Z. WITH THE SYSTEM OVER THE AREA, THE CHANCES FOR FOG TONIGHT LOOK
TO BE LESS THAN THE LAST COUPLE OF NIGHTS, SO HAVE CONFINED MVFR
VISIBILITY TO KDLS AFTER 09Z WITH CLEARING AFTER 18Z. WINDS WILL
REMAIN BELOW 12 KTS FOR THE NEXT 24 HOURS. PERRY

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  53  40  52 /   0  10  20  40
ALW  39  53  43  53 /   0  10  20  40
PSC  35  51  37  52 /   0  10  20  40
YKM  35  49  37  49 /  10  20  40  30
HRI  35  53  39  53 /   0  10  20  40
ELN  30  42  32  45 /  10  40  50  40
RDM  35  58  37  57 /  10  10  20  30
LGD  35  49  38  51 /  10  10  20  20
GCD  32  55  36  55 /   0  10  20  10
DLS  40  54  41  54 /  10  30  30  40

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR ORZ041-044-
     050-505-507-508-510.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR WAZ024-
     026>029-520-521.

&&

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

$$

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