Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 290521 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
920 PM PST FRI NOV 28 2014

UPDATED AVIATION DISCUSSION

.UPDATE...A FRONT IS MOVING THROUGH EASTERN WASHINGTON TONIGHT.
STRONG SOUTHWEST ARE OCCURRING OVER THE LOWER COLUMBIA BASIN. BANDS
OF RAIN ARE MOVING INTO SOUTH CENTRAL WASHINGTON AND NORTH CENTRAL
OREGON. THESE SHOWERS WILL SPREAD ACROSS THE CWA TONIGHT. WINDS
HAVE DECREASED BEHIND FRONT IN THE YAKIMA VALLEY. I CANCELLED THE
WIND ADVISORY FOR THE YAKIMA VALLEY DUE TO THE LIGHTER WINDS. REST
OF FORECAST REMAINS ON TRACK. COONFIELD

&&

.AVIATION...06Z TAFS...WINDS WILL DECREASE THROUGH THE NIGHT. COLD
FRONT IS MOVING THROUGH KALW AND KPDT AT THIS TIME. MAIN RAIN BAND
WILL PUSH SOUTH INTO OREGON BY MIDDAY SATURDAY THOUGH SHOWERS WILL
LINGER OVER MOUNTAINS. MVFR VISIBILITY WITH LIGHT  SHOWERS POSSIBLE
THROUGH THE NIGHT. 76

&&

.PREV DISC... /ISSUED 244 PM PST FRI NOV 28 2014/

SHORT TERM...TONIGHT THROUGH SUNDAY...THE LATEST PACIFIC SYSTEM
WILL MOVE THROUGH THE PACIFIC NORTHWEST TONIGHT THROUGH SATURDAY.
THIS SYSTEM WILL PUSH A MARINE POLAR FRONT THROUGH THE REGION DURING
THE EARLY MORNING HOURS SATURDAY, THEN AN ARCTIC FRONT WILL MOVE
THROUGH DURING THE DAY SATURDAY. BREEZY TO WINDY CONDITIONS WILL
CONTINUE THROUGH THIS EVENING WITH STRONGEST WINDS OVER THE LOWER
BASIN AND YAKIMA VALLEY IN WASHINGTON. ONSHORE FLOW TONIGHT WILL
PRODUCE VARYING AMOUNTS OF RAIN AND SNOW. SNOW LEVELS WILL BEGIN TO
FALL ALONG THE WASHINGTON CASCADE EAST SLOPES LATE THIS EVENING.
ELSEWHERE, SNOW LEVELS WILL FALL OVERNIGHT THROUGH MID MORNING
SATURDAY WITH THE PASSAGE OF THE MARINE POLAR FRONT. SNOW LEVELS
WILL FALL FURTHER, REACHING THE LOWEST ELEVATIONS BY SATURDAY
AFTERNOON DUE TO THE ARCTIC FRONT. OVERALL SNOWFALL WILL BE LIMITED
BELOW 5000 FEET DUE TO THE TIMING OF THE SYSTEM AND THE SNOW LEVEL
DROP. SOME LIGHT UPSLOPE INDUCED SNOW WILL BE POSSIBLE ALONG THE
NORTH AND NORTHEAST FACING MOUNTAIN SLOPES AND FOOTHILLS INTO
SATURDAY EVENING AS THE ARCTIC AIR MASS CONTINUES TO FILTER INTO THE
AREA. EXPECT FAIR, DRY AND COLD CONDITIONS LATE SATURDAY NIGHT
THROUGH SUNDAY. 90

LONG TERM...SUNDAY NIGHT THROUGH WEDNESDAY NIGHT...WARM FRONT WILL
BE LIFTING NORTH LATE SUNDAY NIGHT AND ACROSS NORTHERN OREGON ON
MONDAY. THERE IS STILL A LOT OF DISAGREEMENT IN THE MODELS ON HOW
FAR NORTH INTO WASHINGTON THE WARM FRONT WILL MOVE BY MONDAY NIGHT.
AT THIS TIME IT APPEARS IT WILL REMAIN SOUTH OF A LINE FROM YAKIMA
TO PULLMAN AND THEN GET PUSHED BACK SOUTH ON TUESDAY AS ANOTHER
PIECE OF ENERGY DROPS SOUTH ACROSS WASHINGTON. MODEL SOUNDINGS
INDICATE A CHANCE OF FREEZING RAIN...SLEET AND SNOW IN THE COLUMBIA
RIVER GORGE, PART OF NORTH CENTRAL OREGON FROM MADRAS NORTH AND THE
FOOTHILLS OF THE BLUE MOUNTAINS AND LOWER COLUMBIA BASIN OF OREGON
MONDAY AFTERNOON AND EVENING. THEN BY TUESDAY THE COLD AIR IS WASHED
OUT, LEAVING A CHANCE OF RAIN OR SNOW ACROSS NORTHERN OREGON ON
TUESDAY. THE FLOW BECOMES MORE WESTERLY ON WEDNESDAY WITH MOUNTAIN
SHOWERS. ML

THURSDAY THROUGH FRIDAY...NO MAJOR WEATHER CONCERNS ARE ANTICIPATED
IN DAYS 6-7 OF THE FORECAST. A WESTERLY FLOW WILL KEEP A CHANCE OF
SNOW SHOWERS OVER THE MOUNTAINS AND A SLIGHT CHANCE OF RAIN AND SNOW
SHOWERS ELSEWHERE. EVEN THOUGH THE SNOW LEVELS WILL BE NEAR THE
BASIN FLOOR AT NIGHT...THE THREAT OF PRECIPITATION IS MINIMAL FOR
THE LOWER COLUMBIA BASIN AND SURROUNDING VALLEYS. MODELS ARE HINTING
AT A WEAK RIDGE ON FRIDAY...AND THE UPCOMING SHIFT MAY DECIDE TO
REMOVE POPS FOR MOST OF THE AREA IF THIS MODEL TREND CONTINUES.
WISTER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  37  15  24 /  80  50  20   0
ALW  38  39  18  27 /  80  40  20   0
PSC  36  38  12  28 /  50  20  10   0
YKM  32  36  12  25 /  30  20   0   0
HRI  37  39  11  26 /  40  20  10   0
ELN  28  34   9  26 /  40  20   0   0
RDM  34  37  12  29 /  70  40  20   0
LGD  39  41  13  27 /  80  70  30   0
GCD  35  37  13  30 /  60  70  20   0
DLS  39  43  23  29 /  70  30  10   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...WIND ADVISORY UNTIL 10 PM PST THIS EVENING WAZ028.

&&

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

$$

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