Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 281104
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PST WED JAN 28 2015

.SHORT TERM...TODAY THROUGH FRIDAY...A WEAK SYSTEM CONTINUES TO
DRIFT ACROSS THE REGION EARLY THIS MORNING. THIS SYSTEM WILL CAUSE A
FEW SHOWERS NEAR THE CASCADE CREST TODAY, WITH A FEW SHOWERS IN
WALLOWA COUNTY THIS MORNING. ALSO A FEW SPRINKLES OF FLURRIES WILL
BE POSSIBLE OVER THE BLUES THIS MORNING. THIS SYSTEM HAS MIXED OUT
THE LOW LEVEL INVERSIONS ACROSS MOST OF OUR OREGON ZONES. THE
INVERSIONS IN OVER SOME OF OUR WASHINGTON ZONES PERSIST WITH SOME
AREAS OF DENSE FOG HAVING FORMED EARLY THIS MORNING. ALSO AREAS OF
DENSE FOG HAVE REDEVELOPED IN THE LOWER BASIN IN OREGON. THUS WILL
ISSUE DENSE FOG ADVISORIES FOR THE LOWER BASIN IN OREGON AND
WASHINGTON, AND THE YAKIMA VALLEY IN WASHINGTON FOR MUCH OF THIS
MORNING. ANOTHER WEAK SYSTEM IS EXPECTED TO BRING A FEW SHOWERS TO
SOUTH-CENTRAL WASHINGTON TONIGHT INTO THURSDAY MORNING. OTHERWISE
EXPECT DRY CONDITIONS DUE TO INCREASING UPPER LEVEL HIGH PRESSURE.
THIS UPPER LEVEL HIGH PRESSURE WILL CAUSE LOW LEVEL INVERSIONS TO
INCREASE ACROSS THE INTERIOR NORTHWEST. THUS WILL CONTINUE TO
INDICATE AN INCREASE IN FOG COVERAGE OVER OUR AREA TONIGHT THROUGH
FRIDAY. HIGH TEMPS WILL CONTINUE TO BE WARMER ABOVE THE INVERSIONS,
THOUGH NOT QUITE AS WARM AS IN RECENT DAYS DUE TO SOME COOLING
ALOFT. HIGH AND LOW TEMPS WITHIN FOGGY AREAS WILL SEE LIMITED
DIURNAL CHANGES, WITH HIGH TEMPS IN THE 30S TO LOW 40S. 90

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...HIGH PRESSURE RIDGE
REMAINS OVER FORECAST AREA BEGINNING FRIDAY NIGHT FOR DRY CONDITIONS
PERSISTING THROUGH SATURDAY NIGHT. SUNDAY A WARM FRONT ASSOCIATED
WITH WARM AIR ADVECTION IN THE MID LEVELS USHERS IN A CHANCE OF RAIN
DURING THE DAY ON SUNDAY. THEN A PACIFIC MID/UPPER LEVEL SHORT WAVE
AND ASSOCIATED DYNAMIC LIFT MOVES INTO THE PACIFIC NORTHWEST SUNDAY
NIGHT FOR RAIN LIKELY, EXCEPT FOR A CHANCE OF RAIN IN BENTON AND
FRANKLIN COUNTIES SUNDAY NIGHT.  MONDAY THE UPPER LEVEL SHORT WAVE
MOVES ACROSS FORECAST AREA FOR A CHANCE OF BASIN/VALLEY RAIN AND A
CHANCE OF SNOW IN THE MOUNTAINS WITH SNOW LEVEL 4500-5500 FEET
THROUGH MONDAY AFTERNOON. MONDAY NIGHT A WEAK DISTURBANCE MOVES
THROUGH SOUTHERN OREGON FOR A CHANCE OF RAIN IN CENTRAL AND NORTH
CENTRAL OREGON, THE BLUE MOUNTAINS AND THE EAST SLOPES OF THE
CASCADES. A MID/UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS OVER THE
REGION ON TUESDAY.  POLAN

&&

.AVIATION...12Z TAFS...YESTERDAY A MID/UPPER LEVEL LOW SOUTHEAST OF
TAF SITES AND A PASSING WEAK WEATHER SYSTEM HAS BROKEN UP LOW FOG
AND STRATUS DECK EXCEPT AT KPSC AND KYKM. COOLER TEMPERATURES ABOVE
THE INVERSION PREVENT FOG FROM FORMING AT OTHER TAF SITES THROUGH
29/03Z, BUT FOG AND STRATUS MAY START TO FORM AT KALW AND KPDT AFTER
29/03Z WHILE CONDITIONS WORSEN AT KYKM AND KPSC AS BRIEF SUBSIDENCE
OCCURS BETWEEN WEATHER SYSTEMS. ANOTHER WEATHER DISTURBANCE WILL
APPROACH CENTRAL WASHINGTON AND BRING A VICINITY SHOWER TO KYKM
AFTER 29/03Z.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  49  33  40  32 /  10  10  10   0
ALW  46  35  43  34 /  10  10  10   0
PSC  41  35  44  34 /   0  10  10   0
YKM  41  33  42  32 /  10  20  20   0
HRI  42  34  44  34 /   0  10  10   0
ELN  49  33  42  32 /  10  20  20   0
RDM  56  29  46  28 /  10  10  10   0
LGD  50  29  47  29 /  10  10  10   0
GCD  52  33  50  32 /  10  10  10   0
DLS  50  39  46  36 /  10  20  10   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 11 AM PST THIS MORNING ORZ044.

WA...DENSE FOG ADVISORY UNTIL 11 AM PST THIS MORNING WAZ027-028.

&&

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

$$

90/99/99










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