Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 251100
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PST SUN JAN 25 2015

.SHORT TERM...TODAY THROUGH TUESDAY. STRONG UPPER LEVEL RIDGE OVER
THE AREA TODAY. VERY WARM TEMPERATURES AT 850MB. WILL RESULT IN HIGH
TEMPS IN THE 60S WITH POSSIBLE LOWER 70S. EXCEPTION TO THIS WILL BE
THE COLUMBIA BASIN AND ADJACENT VALLEYS WHERE FOG IS CURRENTLY
DEVELOPING. EXTENT OF FOG IMPLIES A DECENT LOW LEVEL INVERSION OVER
THE BASIN WHICH WILL KEEP TEMPS DOWN. WILL GO WITH HIGHS IN THE 40S
AND 50S FOR THESE LOCATIONS. SATELLITE SHOW A LITTLE CIRRUS WILL BE
MOVING THROUGH DURING THE DAY OTHERWISE MOSTLY SUNNY SKIES. WINDY IN
THE GRANDE RONDE VALLEY WHICH WILL CONTINUE THROUGH MONDAY. HAVE
ISSUED A WIND ADVISORY FOR THIS. THE UPPER RIDGE HOLDS IN PLACE
MONDAY WITH ANOTHER MOSTLY SUNNY AND WARM DAY. ALTHOUGH NOT QUITE AS
WARM AS TODAY. 850MB TEMPS ARE STARTING TO FALL AT THIS POINT.
EXPECT AREAS OF LOW CLOUDS AND FOG AGAIN IN THE COLUMBIA BASIN AND
ADJACENT VALLEYS WITH COOLER TEMPS. SURFACE GRADIENTS MAINTAIN WINDY
CONDITIONS IN THE GRANDE RONDE VALLEY. THE RIDGE MOVES OFF TO THE
EAST TUESDAY ALLOWING A WEATHER SYSTEM TO APPROACH THE REGION. CLOUDS
WILL BE INCREASING WITH COOLER TEMPS. 94

.LONG TERM...TUESDAY NIGHT THROUGH SATURDAY.  A MID/HIGH LEVEL RIDGE
OF HIGH PRESSURE WILL HOLD SWAY OVER THE INTERIOR PACIFIC NORTHWEST
THROUGHOUT THE PERIOD FOR MAINLY DRY CONDITIONS. A WEAK MID/UPPER
LEVEL PACIFIC SHORT WAVE MOVES THROUGH THE RIDGE TUESDAY NIGHT AND
WEDNESDAY WITH THE BEST CHANCE FOR MEASURABLE RAIN IN THE BLUE
MOUNTAINS FROM AROUND MIDNIGHT THROUGH WEDNESDAY AFTERNOON. SNOW
LEVELS WITH THIS SYSTEM WILL BE 6000-6500 FEET TUESDAY NIGHT AND
WEDNESDAY. AS SUCH THE HIGHEST MOUNTAINS ABOVE 6500 FEET WILL GET
SOME LIGHT SNOW TUESDAY NIGHT AND WEDNESDAY. THE RIDGE BUILDS BACK
AGAIN WEDNESDAY NIGHT THROUGH SATURDAY FOR DRY CONDITIONS.  POLAN

&&

.PREVIOUS AVIATION DISCUSSION...06Z TAFS...MAINLY VFR CONDITIONS
WILL PREVAIL TONIGHT EXCEPT AT KPSC...KYKM...KALW...KDLS WHERE LOWER
CIGS AND VISIBILITY WITH PATCHY FOG MAY CAUSE IFR CONDITIONS AT
TIMES TONIGHT AND SUNDAY MORNING. WINDS WILL BE LIGHT AND VARIABLE
THROUGH THE NEXT 24 HOURS AT ALL TAF SITES.  88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  63  41  56  36 /   0   0   0   0
ALW  60  41  58  38 /   0   0   0   0
PSC  47  35  48  35 /   0   0   0   0
YKM  48  33  47  33 /   0   0   0   0
HRI  53  35  51  35 /   0   0   0   0
ELN  50  35  49  32 /   0   0   0   0
RDM  69  39  63  35 /   0   0   0   0
LGD  53  38  50  34 /   0   0   0   0
GCD  62  38  58  31 /   0   0   0   0
DLS  58  37  56  39 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WIND ADVISORY FROM 10 AM THIS MORNING TO 3 PM PST MONDAY ORZ049.

WA...NONE.
&&

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

$$

94/99/99







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