Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 242334 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
333 PM PST WED DEC 24 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH SATURDAY...VARIOUS WINTER WEATHER
HIGHLIGHTS REMAIN IN EFFECT FOR CENTRAL AND NORTHEAST OREGON...AS A
COLD FRONT CONTINUES TO PUSH EAST.  FOR MORE DETAILS ON THE WINTER
HIGHLIGHTS PLEASE REFER TO PRODUCT PDXWSWPDT.  MODERATE RAIN AND
SNOW HAVE BEEN REPORTED ACROSS SEVERAL LOCATIONS...WITH SNOW
REACHING AS LOW AS 1500FT MSL.  HOWEVER MOST SNOW BELOW 2000FT WOULD
MELT ON CONTACT AS THE AIR AND GROUND TEMPERATURE WOULD RANGE FROM
33-35 DEGREES.  LATEST RADAR IMAGERY INDICATES THAT MOST OF THE RAIN
AND SNOW COULD BE ENDING IN THE NEXT 2 TO 6 HOURS.  AS THE RAIN/SNOW
BAND BACK EDGE IS NOW APPROACHING A CONDON...PENDLETON...WALLA WALLA
LINE.  SO EXPECT THESE AREAS TO TAPER OFF TO ISOLATED RAIN/SNOW
SHOWERS FOR THE REMAINDER OF THE EVENING.  WILL HOLD OFF ON ENDING
ANY ADVISORIES EARLY FOR THE EVENING SHIFT...TO SEE IF THE GENERAL
NORTHWEST FLOW WILL CONTINUE UPSLOPE SHOWERS.  DUE TO THE WET NATURE
OF THE SNOW...AND THE OVERALL TEMPERATURES STAYING NEAR FREEZING
SNOW ACCUMULATION AMOUNTS HAVE COME IN A FEW INCHES LESS THAN
ANTICIPATED ACROSS MOST AREAS.

TONIGHT ONWARD...MOUNTAIN SNOW WILL DIMINISH AND COLD DRY NORTHERLY
FLOW WILL SET INTO THE AREA.  DAYTIME HIGHS ON CHRISTMAS WILL BE IN
THE 30S...WITH SOME OF THE WARM SPOTS REACHING THE LOWER 40S.  THE
MOUNTAINS CAN EXPECT TO BE IN THE MID TO UPPER 20S.  SLIGHT CHANCE
OF LINGERING UPSLOPE SNOW SHOWERS POSSIBLE ACROSS THE MOUNTAINS AS
WELL...BUT OVERALL EXPECT MOST AREAS TO REMAIN DRY.  FRIDAY WILL BE
VERY SIMILAR...WITH A LESSER CHANCE OF UPSLOPE SHOWERS.  BY LATE
FRIDAY EVENING INTO EARLY SATURDAY MORNING THE NEXT WEATHER SYSTEM
WILL MOVE IN FROM THE GULF OF ALASKA.  EXPECT THAT PRECIPITATION
WILL BE MAINLY IN THE FORM OF SNOW ABOVE 2500 FEET...WITH SNOW
LEVELS QUICKLY DROPPING OFF OVERNIGHT FRIDAY NIGHT.  WEBER

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...ON SATURDAY NIGHT
AND SUNDAY A LOW WILL MOVE THROUGH THE AREA WITH ENOUGH MOISTURE FOR
SOME SIGNIFICANT SNOWFALL. NOT ONLY WILL SEVERAL INCHES OF SNOW BE
POSSIBLE IN THE MOUNTAINS...BUT SNOW LEVELS WILL BE DROPPING AND A
COUPLE OF INCHES MAY ALSO ACCUMULATE AT THE LOWER ELEVATIONS. WINTER
WEATHER HIGHLIGHTS MAY EVENTUALLY BE ISSUED FOR THIS WEATHER SYSTEM.
SNOW SHOWERS WILL THEN DIMINISH ON SUNDAY NIGHT AND MUCH DRIER
CONDITIONS WILL PREVAIL THROUGH WEDNESDAY. WITH A STRONG RIDGE OF
HIGH PRESSURE IN THE EASTERN PACIFIC AND A DEEP LOW PRESSURE TROUGH
OVER THE CENTRAL U.S....A MUCH COOLER NORTHERLY FLOW WILL PERSIST.
THE LATEST MODEL RUNS HAVE TRENDED BACK TOWARDS COLDER TEMPERATURES
WITH HIGHS IN THE 20S TO LOWER 30S AND LOWS IN THE TEENS TO LOWER
20S. THE BIGGEST FORECAST CONCERN IS WHETHER OR NOT FREEZING FOG
WILL DEVELOP IN THE LOWER COLUMBIA BASIN. AT THIS TIME IT APPEARS
THAT SURFACE DEWPOINT DEPRESSIONS WILL BE TOO LARGE FOR FOG SO HAVE
LEFT IT OUT OF THE FORECAST.  COBB

&&

.AVIATION...00Z TAFS...CONDITIONS ARE IMPROVING AS A COLD FRONT
STARTS TO MOVE OUT OF THE AREA. VFR CONDITIONS HAVE RETURNED AT
KYKM...KDLS...KBDN...KRDM AND KPSC WITH RAIN AND SNOW ENDING.
PRECIPITATION WILL END AT KALW AND KPDT BY 01Z. HOWEVER...UPSLOPE
FLOW WILL CAUSE CEILINGS TO REMAIN LOW AT THESE SITES. BREEZY WINDS
OF 15-30 KTS CAN BE EXPECTED AT KDLS...KBDN AND KPDT TONIGHT...THEN
DIMINISHING ON THURSDAY. RELATIVELY LIGHT WINDS LESS THAN 15 KTS CAN
BE EXPECTED AT THE OTHER TAF SITES THE NEXT 24 HOURS.  82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  36  26  34 /  30  10  10  10
ALW  31  36  27  35 /  40  10  10  10
PSC  30  42  28  39 /  10  10  10  10
YKM  29  39  26  36 /  10  10  10  10
HRI  32  41  29  39 /  10  10  10  10
ELN  29  40  25  37 /  10  10  10  10
RDM  26  35  22  33 /  50  20  10  10
LGD  29  35  21  33 /  80  20  20  10
GCD  30  39  24  34 /  80  30  20  10
DLS  37  44  33  42 /  20  20  20  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ509.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ050.

     WINTER STORM WARNING UNTIL 4 AM PST THURSDAY ORZ502.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ511.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ508.

     WINTER STORM WARNING UNTIL 4 AM PST THURSDAY ORZ506.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ABOVE 1500 FEET
     FOR THE ORZ507.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ505.

     WINTER STORM WARNING UNTIL 4 AM PST THURSDAY ORZ503.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ORZ049.

WA...WINTER STORM WARNING UNTIL 4 AM PST THURSDAY WAZ030.

     WINTER WEATHER ADVISORY UNTIL 4 AM PST THURSDAY ABOVE 1500 FEET
     FOR THE WAZ029.

&&

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

$$

89/82/82






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