Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 080537 AAA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
935 PM PST SUN FEB 7 2016

UPDATED AVIATION DISCUSSION

.SHORT TERM...FORECAST ON TRACK AND NO UPDATES PLANNED. IT WILL BE
A TRANQUIL WEATHER NIGHT WITH MOSTLY CLEAR SKIES AND LIGHT WINDS.
RADIATIONAL FOG MAY DEVELOP NEAR THE RIVER VALLEYS AND SOME OF
THE WIND-PROTECTED VALLEYS OF THE BLUE MTNS AND THE OCHOCO MTNS
TONIGHT...AND THIS IS COVERED IN THE CURRENT FORECAST. OVERNIGHT
LOWS WILL BE IN THE 20S TO LOWER 30S. WISTER

&&

.AVIATION...06Z TAFS. THIN HIGH CIRRUS CLOUDS CAN BE EXPECTED AT ALL
TAF SITES TONIGHT AND MONDAY. WINDS WILL BE 5 KTS OR LESS. BELIEVE
ANY FOG DEVELOPMENT WILL BE CONFINED TO THE SNAKE AND COLUMBIA
RIVERS...SO KPSC MAY SEE 3-5SM BR EARLY MONDAY MORNING. AN EASTERLY
GRADIENT MAY ALLOW STRATUS CLOUDS TO DEVELOP NEAR KDLS AFTER
MIDNIGHT BUT WILL ONLY KEEP A SCT DECK AROUND 1500 FEET AGL.  WISTER

&&

.PREV DISCUSSION... /ISSUED 130 PM PST SUN FEB 7 2016/

SHORT TERM...TONIGHT THROUGH WEDNESDAY...HIGH PRESSURE IS BUILDING
OVER THE REGION AND WILL CONTINUE TO INTENSIFY OVER THE REGION
THROUGH THE SHORT TERM. THIS WILL LEAD TO A DEVELOPING LOW LEVEL
INVERSION WHICH WILL BEGIN TO TRAP MOISTURE IN THE FORM OF FOG AND
LOW CLOUDS AROUND THE LOWER COLUMBIA BASIN AND SOME MOUNTAIN
VALLEYS. SOME OF THIS COULD BEGIN TO FORM OVERNIGHT AND THEN MOSTLY
DISSIPATE ON MONDAY. BUT AS TIME GOES ON THE DISSIPATION WILL BE
LESS AND THE FOG WILL BECOME MORE PERSISTENT. TEMPERATURES ABOVE THE
INVERSION WILL RUN ABOVE NORMAL WHILE BELOW NORMAL BENEATH THE
INVERSION.


LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY. MAINLY DRY AND MILD
CONDITIONS WILL PERSIST THROUGH THURSDAY.  ON FRIDAY THE RIDGE WILL
BE SHIFTING EAST AS A TROUGH OF LOW PRESSURE MOVES TO THE COAST WITH
A CHANCE OF RAIN SPREADING EAST OF THE CASCADES.  THERE WILL
CONTINUE TO BE A CHANCE OF RAIN FRIDAY NIGHT WITH MOUNTAIN SNOW
THROUGH SATURDAY AS SNOW LEVEL LOWER TO NEAR 5500 FEET.  THE
UNSETTLED CONDITIONS CONTINUE THROUGH SUNDAY AS ANOTHER SYSTEM
PUSHES THROUGH THE RIDGE.  TEMPERATURES WILL BE MILD THROUGH MID
WEEK AND THEN COOL TO NEAR SEASONAL LEVELS THROUGH NEXT WEEKEND. 93

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  31  51  33  51 /   0   0   0   0
ALW  32  52  35  48 /   0   0   0   0
PSC  29  49  33  46 /   0   0   0   0
YKM  29  49  31  46 /   0   0   0   0
HRI  30  49  33  46 /   0   0   0   0
ELN  26  44  29  44 /   0   0   0   0
RDM  31  59  33  58 /   0   0   0   0
LGD  30  49  34  48 /   0   0   0   0
GCD  29  55  31  54 /   0   0   0   0
DLS  33  54  36  51 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&

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

$$

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