Area Forecast Discussion
Issued by NWS Pendleton, OR

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117
FXUS66 KPDT 091816 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1015 AM PST TUE FEB 9 2016

UPDATED AVIATION DISCUSSION

.SHORT TERM...A PERSISTENT WEATHER PATTERN WILL CONTINUE AS A RIDGE
OF HIGH PRESSURE RESIDES OVER THE REGION. WILL AGAIN SEE SOME NEAR
RECORD HIGH TEMPERATURES TODAY IN THE HIGHER ELEVATIONS. MEANWHILE
AN INVERSION WILL KEEP TEMPERATURES COOLER IN THE LOWER ELEVATIONS
AND THERE WILL BE SOME PATCHY FOG AND LOW CLOUDS THIS MORNING WITH
MOST BURNING OFF BY AFTERNOON BUT WILL RETURN OVERNIGHT. ONLY MINOR
CHANGES MADE IN THE MORNING FORECAST UPDATE.

&&

.AVIATION...18Z TAFS...VFR CONDITIONS WILL BE CONTINUE THROUGH THIS
EVENING. THEN A STRENGTHENING INVERSION WILL TRAP AND INCREASE
MOISTURE IN THE BOUNDARY LAYER PRODUCING LOW CIGS AND FOG DUE TO
INCREASING AREAL COVERAGE OF LOW STRATUS AND FOG IN THE LOWER
COLUMBIA BASIN AND ADJACENT VALLEYS BEGINNING AROUND MIDNIGHT AND
CONTINUING WELL PAST DAYBREAK ON WEDNESDAY. AS SUCH CONDITIONS ARE
EXPECTED TO DETERIORATE AT KYKM, KPSC, KRDM AND KBDN BECOMING VLIFR
AT KRDM AND KBDN, WITH KPSC AND KYKM BECOMING LIFR.

I KEPT KDLS, KPDT AND KALW AT VFR FOR THE NEXT 24 HOURS, AS GUIDANCE
SHOWED DOWNSLOPE DRAINAGE WINDS YIELDING MIXING IN COMBINATION WITH
A DRIER BOUNDARY LAYER INITIALLY, THESE FACTORS SHOULD WORK AGAINST
FORMATION OF FOG AND LOW STRATUS CLOUDS AT THOSE TAF SITES TONIGHT.
IF VISIBILITY DOES LOWER TO 5-6SM WITH LOCALIZED MVFR CONDITIONS AT
KDLS, KPDT AND KALW, THESE SITES WILL BE AMENDED OR THEIR FORECAST
UPDATED WITH NEW SCHEDULED TAF ISSUANCES LATER TODAY IF MODEL
FORECAST GUIDANCE CHANGES.

SURFACE WINDS LESS THAN 10 KTS FOR THE NEXT 24 HOURS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  48  30  51  36 /   0   0   0  10
ALW  48  31  50  38 /   0   0   0  10
PSC  50  28  50  34 /   0   0   0  10
YKM  52  29  48  34 /   0   0   0  10
HRI  48  28  50  35 /   0   0   0  10
ELN  39  20  46  32 /   0   0   0  10
RDM  65  28  58  36 /   0   0   0  10
LGD  49  34  48  35 /   0   0   0  10
GCD  60  33  54  30 /   0   0   0  10
DLS  54  32  54  40 /   0   0   0  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR ORZ041-044-
     050-502-503-505-507-508-510.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST SATURDAY FOR WAZ024-
     026>029-520-521.

&&

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

$$

91/99/99



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