Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 191603 AAA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
855 AM PDT FRI SEP 19 2014

.UPDATE...SOME LOW AND MID LEVEL CLOUDS WERE OVER THE BLUE/WALLOWA
MOUNTAINS THIS MORNING AND THE RESULT WAS TO LOWER AFTERNOON HIGH
TEMPS SLIGHTLY. THE CLOUDS SHOULD SLOWLY SLIP EAST TODAY MAINTAINING
THE DRY CONDITIONS FOR THE REMAINDER OF THE DAY. MEANWHILE A WEAK
DISTURBANCE PASSING THROUGH THE REGION COULD PROVIDE SOME MID AND
HIGH LEVEL CLOUDS FROM THE WEST. OTHERWISE A RIDGE OF HIGH PRESSURE
WILL CONTINUE TO INFLUENCE THE AREA WITH ABOVE NORMAL TEMPERATURES
AND THE SHORT TERM FORECAST APPEARS ON TRACK FOR NOW.

&&

.PREV DISC... /ISSUED 402 AM PDT FRI SEP 19 2014/

SHORT TERM...TODAY THROUGH SUNDAY NIGHT...TODAY AND SATURDAY AN
UPPER LEVEL RIDGE WILL BUILD OVER THE PACIFIC NORTHWEST WITH
CLEARING SKIES AND WARMING DAYTIME TEMPERATURES. WINDS WILL
GENERALLY BE LIGHT...ALLOWING STRONG RADIATIONAL COOLING AT NIGHT,
PARTICULARLY IN MOUNTAIN VALLEYS. SUNDAY THE RIDGE AXIS WILL MOVE
INTO IDAHO AND SOUTHWEST FLOW WILL BEGIN IN EASTERN WASHINGTON AND
OREGON. THE SOUTHWEST FLOW MAY BRING SOME MID LEVEL MOISTURE INTO
EASTERN OREGON FROM A CUTOFF LOW IN NEVADA. I INCREASED THE CLOUD
COVER OVER THE SOUTHERN BLUES, OCHOCOS, AND WALLOWA MOUNTAINS WHERE
SOME FAIR WEATHER CUMULUS MAY DEVELOP.  COONFIELD

LONG TERM...MONDAY THROUGH FRIDAY...A SIGNIFICANT CHANGE IN THE
WEATHER PATTERN IS PROGGED DURING THE FORECAST PERIOD.  A RIDGE OF
HIGH PRESSURE WILL BE MOVING ACROSS WASHINGTON AND OREGON ON MONDAY
WITH HIGH TEMPERATURES IN THE UPPER 70S TO UPPER 80S.  A WEAK COLD
FRONT WILL MOVE ACROSS THE AREA ON TUESDAY HELPING SHAVE ABOUT 5
DEGREES OFF THE HIGH TEMPERATURE AND SPREADING MID AND UPPER LEVEL
CLOUDS ACROSS THE TWO STATE AREA.  INCREASING SOUTHWESTERLY FLOW
TUESDAY MAY ALSO LEAD TO A SLIGHT CHANCE OF SHOWERS OVER THE EAST
SLOPES OF THE CASCADES AND A SLIGHT CHANCE OF THUNDERSTORMS OVER THE
NORTHEASTERN OREGON MOUNTAINS.  AS THE MAIN SYSTEM MOVES ASHORE
TUESDAY NIGHT INTO WEDNESDAY...A COLD FRONT ACCOMPANYING THE SYSTEM
WILL MOVE ACROSS THE REGION BRINGING A CHANCE OF SHOWERS FOR THE TWO
STATE AREA AND A SLIGHT CHANCE OF THUNDERSTORMS OVER THE
NORTHEASTERN OREGON MOUNTAINS.  THIS WEATHER SYSTEM WILL NOT MOVE
ACROSS THE AREA QUICKLY...BRINGING A PROLONGED CHANCE OF SHOWERS
THROUGHOUT THE AREA THROUGH THE END OF THE NEXT WORK WEEK. HIGH
TEMPERATURES FOR THE WEDNESDAY TO FRIDAY PERIOD WILL BE IN THE MID
60S TO MID 70S IN THE LOWER COLUMBIA BASIN AND IN THE UPPER 50S TO
UPPER 60S ACROSS THE HIGHER ELEVATIONS.  BIEDA

AVIATION...12Z TAFS...VFR CONDITIONS ARE EXPECTED DURING THE TAF
PERIOD.  A SHALLOW MARINE LAYER WILL AFFECT KDLS WITH CIG AOA 4K FT
AGL THRU 19/22Z.  OTHERWISE...PASSING MID TO HIGH LEVEL CLOUDS AOA
20K FT AGL WILL CONTINUE THRU 20/04Z AT ALL OTHER TAF SITES.  WINDS
WILL BE AOB 10 KTS THRU THE PERIOD...EXCEPTION BEING KDLS WHERE
AFTERNOON WINDS WILL BE 15 TO 25 KTS BTWN 19/22Z TO 20/03Z AS
WESTERLY WINDS ACCELERATE THROUGH THE GORGE.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  78  53  85  54 /   0   0   0   0
ALW  80  58  85  60 /   0   0   0   0
PSC  83  52  86  54 /   0   0   0   0
YKM  82  54  86  55 /   0   0   0   0
HRI  82  48  86  49 /   0   0   0   0
ELN  81  50  85  52 /   0   0   0   0
RDM  78  42  86  45 /   0   0   0   0
LGD  76  46  84  47 /   0   0   0   0
GCD  79  49  87  49 /   0   0   0   0
DLS  82  54  89  53 /   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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