Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 280551
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
950 PM PST FRI FEB 27 2015

.SHORT TERM...SATELLITE SHOWS UPPER LOW CENTERED OVER WESTERN OREGON
THIS EVENING. PRECIPITATION CONTINUES MAINLY OVER OREGON AND THE
SOUTHERN WASHINGTON CASCADES. THE LOW WILL MOVE SOUTH OVERNIGHT INTO
CALIFORNIA AND NEVADA ON SATURDAY. RAIN AND HIGHER ELEVATION SNOW
WILL GRADUALLY MOVE SOUTH WITH THE LOW...EXITING THE FORECAST AREA
BY SATURDAY MORNING. NORTHERLY WINDS WILL INCREASE TONIGHT AND
CONTINUE INTO SATURDAY. STRONGEST WINDS WILL BE OVER THE COLUMBIA
BASIN. SIGNIFICANTLY COOLER TOMORROW AS COMPARED TO THE PAST SEVERAL
DAYS. HIGHS IN THE 30S AND 40S. UPPER RIDGE OVER THE AREA SATURDAY
NIGHT WITH CLEAR SKIES AND LIGHT WINDS. IT WILL BE COLD WITH LOWS IN
THE TEENS AND 20S. LOCATIONS IN CENTRAL AND NORTHEAST OREGON WITH
FRESH SNOW COVER DROP TO ZERO TO 10 DEGREES. SUNDAY WILL BE SUNNY AS
HIGH PRESSURE REMAINS OVER THE REGION. 94

.AVIATION...06Z TAFS. SNOW OVERNIGHT AT RDM BDN WITH CEILINGS
010-020. REMAINDER OF THE TAF SITES CEILINGS 050-100 TONIGHT. SNOW
WILL END AT RDM BDN SATURDAY MORNING. ALL SITES WILL HAVE IMPROVING
CONDITIONS WITH CLEARING SKIES DURING THE DAY. PSC WILL HAVE GUSTY
NORTH WINDS 15-25KT.

&&

.PREV DISC... /ISSUED 335 PM PST FRI FEB 27 2015/

SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT...THE LATEST PACIFIC
SYSTEM WILL CONTINUE TO WEAKEN AND DROP SOUTH-SOUTHEAST ALONG THE
PACIFIC NORTHWEST COAST THIS EVENING. THIS SYSTEM WILL THEN
REDEVELOP OVER THE GREAT BASIN LATER TONIGHT. A DEFORMATION PRECIP
BAND ASSOCIATED WITH THE SYSTEM CURRENTLY EXTENDS FROM SOUTHEAST
OREGON NORTHWEST TO SOUTH-CENTRAL WASHINGTON. THIS BAND WILL BECOME
ALIGNED EAST TO WEST ACROSS EAST-CENTRAL AND CENTRAL OREGON TONIGHT
AS THE SYSTEM STRENGTHENS OVER NEVADA. WITH THE PRECIP BAND OVER
EAST-CENTRAL AND CENTRAL OREGON OVERNIGHT AND LOW TEMPS FALLING
BELOW FREEZING, EXPECT SNOW ACCUMULATIONS TO CONTINUE ACROSS THIS
AREA. AS SUCH WILL CONTINUE THE CURRENT WINTER WEATHER HIGHLIGHTS.
WILL SEE PRECIP CHANCES DECREASE THROUGH THE NIGHT ACROSS OUR
WASHINGTON AND NORTHERN OREGON ZONES AS THE PRECIP BAND ADJUSTS IT`S
POSITION. COOLER AND DRIER AIR WILL MOVE INTO THE REGION LATE
TONIGHT AND SATURDAY. THUS THE PRECIP OVER EAST-CENTRAL AND CENTRAL
OREGON WILL WIND DOWN SATURDAY MORNING, AND LARGELY BE DONE BY
AFTERNOON. NORTHERLY WINDS WILL INCREASE ACROSS THE AREA LATE
TONIGHT AND PERSIST INTO SATURDAY. THESE WINDS LOOK TO BE STRONGEST
ACROSS THE LOWER COLUMBIA BASIN, THE YAKIMA VALLEY AND THE SIMCOE
HIGHLANDS. THESE WINDS MAY APPROACH SUSTAINED 30 MPH AT SOME
LOCATIONS. FOR NOW WILL HOLD OFF ON ANY WIND ADVISORIES AS WOULD
LIKE TO SEE HOW THINGS PROGRESS THROUGH THE NIGHT. SUNDAY WILL SEE
FAIR, DRY AND COOL CONDITIONS. ANOTHER SYSTEM WILL BEGIN TO APPROACH
THE REGION LATE SUNDAY NIGHT. AT THIS TIME EXPECT INCREASING CLOUDS
SUNDAY NIGHT WITH A SLIGHT CHANCE OF LIGHT PRECIP REACHING THE
CASCADE CREST LATE SUNDAY NIGHT. 90

LONG TERM...MONDAY THROUGH FRIDAY...A SHORTWAVE WILL MOVE DOWN FROM
THE NORTH ON MONDAY...BRINGING A CHANCE OF RAIN AND SNOW SHOWERS. AS
THIS DISTURBANCE MOVES AWAY FROM THE AREA ON TUESDAY...SHOWERS WILL
TAPER OFF. NORTHERLY FLOW WILL RETURN BEHIND THE COLD FRONT AND
COOLER TEMPERATURES CAN ALSO BE EXPECTED ON TUESDAY...WITH HIGHS
ONLY IN THE MID 20S TO LOWER 40S. HIGH PRESSURE WILL THEN BUILD INTO
THE REGION ON WEDNESDAY AND THE AREA WILL BE MOSTLY DRY THROUGH
FRIDAY. TEMPERATURES WILL GRADUALLY WARM DURING THIS PERIOD AND
HIGHS ON FRIDAY WILL BE IN THE 50S. A DEEP TROUGH OF LOW PRESSURE
WILL BE APPROACHING THE COAST AT THE END OF THE WEEK...BUT ANY LOCAL
PRECIPITATION SHOULD BE LIMITED TO THE CASCADES. COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  27  42  20  44 /  50  10   0   0
ALW  30  43  24  44 /  20  10   0   0
PSC  32  50  19  49 /  10   0   0   0
YKM  34  49  22  48 /  30   0   0   0
HRI  30  48  18  48 /  20  10   0   0
ELN  31  48  20  49 /  20  10   0   0
RDM  25  37   8  46 /  80  30   0   0
LGD  30  41  15  42 /  70  20   0   0
GCD  25  37  10  43 /  80  60   0   0
DLS  34  52  24  49 /  30  10   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WINTER STORM WARNING UNTIL 7 AM PST SATURDAY ORZ506.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST SATURDAY ORZ511.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST SATURDAY ORZ505.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST SATURDAY ORZ503.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST SATURDAY ORZ509.

WA...NONE.
&&

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

$$

94





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