Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 301733 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
1032 AM PDT TUE SEP 30 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...COLD FRONT HAS MOVED WELL EAST OF THE REGION HOWEVER
UPPER LEVEL TROUGH WITH COOL CYCLONIC FLOW WILL REMAIN OVER THE
REGION TODAY. NORTHWEST UPSLOPE FLOW WILL KEEP SKIES MOSTLY CLOUDY
OVER THE CASCADES AND BLUES WITH ISOLATED SHOWERS THROUGH EVENING.
REMAINDER OF THE FORECAST AREA MOSTLY CLEAR NOW BUT EXPECT SOME
CUMULUS TO DEVELOP WITH THE COOLER AIR ALOFT. BREEZY TO LOCALLY
WINDY CONDITIONS THROUGH THE DAY. STRONGEST WINDS IN THE GORGE AND
KITTITAS VALLEY. DIMINISHING CLOUDS AND WINDS TONIGHT WITH COOL
TEMPERATURES. SOME LOCATIONS WILL DROP BELOW FREEZING...ESPECIALLY
CENTRAL AND NORTHEAST OREGON. 94

.AVIATION...18Z TAFS...VFR CONDITIONS EXPECTED AT ALL TAF SITES
THROUGH THE PERIOD. MAIN CONCERN TODAY WILL BE GUSTY WEST TO
NORTHWEST WINDS BEHIND AN EXITING COLD FRONT. WINDS WILL BE BTWN 15
TO 30 KTS THRU 01/03Z BEFORE DIMINISHING TO AOB 10 KTS OVERNIGHT.
MVFR HAZE AND/OR AREAS OF BLOWING DUST INVOF OF KPDT IS POSSIBLE
THRU 01/03Z...BUT WILL NOT INCLUDE IN TAFS DUE TO UNCERTAINTY.
VICINITY SHOWERS NEAR KPDT AND KALW DUE TO PASSING SHORTWAVE BTWN
01/00Z TO 01/04Z. MURPHY/BIEDA

&&

.PREV DISC... /ISSUED 109 AM PDT TUE SEP 30 2014/

SHORT TERM...TODAY THROUGH THURSDAY...A COLD FRONT WHICH MOVED
ACROSS THE CWA LAST EVENING BROUGHT SOME RAIN SHOWERS TO THE EASTERN
CWA. THESE HAVE MOVED OFF TO THE EAST. WINDS HAVE PICKED UP WITH AND
BEHIND THE FRONT TO LOCALLY BREEZY TO WINDY. THE WINDS ARE EXPECTED
TO INCREASE FURTHER TODAY. WINDS IN THE KITTITAS VALLEY ARE EXPECTED
TO REACH WIND ADVISORY SPEEDS AROUND 15-16Z THIS MORNING. WILL BE
ISSUING A WIND ADVISORY FROM 15Z-00Z TODAY FOR THE KITTITAS VALLEY
AS A RESULT. THE STRONGEST WINDS WILL OCCUR DURING TIMES OF MAXIMUM
MIXING THIS AFTERNOON. AFTER THAT TIME THE WINDS ARE EXPECTED TO
DIMINISH QUICKLY TONIGHT AS PRESSURE GRADIENTS RELAX AND DUE TO
NIGHT TIME STABILIZATION OF THE ATMOSPHERE. THE NEXT CONCERN WILL BE
COLD TEMPERATURES TONIGHT AND WEDNESDAY NIGHT. TEMPERATURES TONIGHT
IN CENTRAL OREGON (MADRAS...REDMOND AND BEND) ARE ALL EXPECTED TO
DROP TO OR BELOW FREEZING. WILL BE ISSUING A FREEZE WARNING THERE
FOR TONIGHT. ON WEDNESDAY NIGHT TEMPERATURES WILL NOT BE AS COLD. ON
WEDNESDAY COOL TEMPERATURE WILL CONTINUE IN A NORTHWEST FLOW ALOFT.
AFTER THAT AN UPPER RIDGE WILL BEGIN TO BUILD BACK OVER THE REGION
BEGINNING ON THURSDAY WITH A WARMING TREND. 88

LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...A RIDGE OF HIGH
PRESSURE WILL BUILD OVER WESTERN NORTH AMERICA THROUGH THE FORECAST
PERIOD. THIS WILL PLACE THE FORECAST AREA IN FAST WESTERLY FLOW
ALOFT RESULTING IN SOME CLOUD COVER BUT LITTLE IN THE WAY OF
PRECIPITATION. IT WILL BE WARM WITH TEMPERATURES ABOVE NORMAL FOR
THIS TIME OF YEAR. ON SATURDAY...A WEAK DISTURBANCE WILL FLATTEN THE
RIDGE AND PERHAPS PUSH A WEAK COOL FRONT ACROSS THE REGION FROM THE
NORTH. THE MODELS ARE SHOWING LIMITED MOISTURE WITH THIS FEATURE SO
FOR NOW HAVE CONFINED POPS TO THE WASHINGTON CASCADE CREST. ANY
MOISTURE OVER THE AREA WILL BE SHORT LIVED...WITH A RETURN TO DRY
CONDITIONS FOR EARLY NEXT WEEK. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  65  39  66  40 /  10  10   0   0
ALW  66  42  66  44 /  10  10   0   0
PSC  71  39  69  41 /  10   0   0   0
YKM  66  35  67  41 /  10   0   0   0
HRI  69  37  68  40 /  10   0   0   0
ELN  62  39  63  38 /  10   0   0   0
RDM  61  27  63  31 /   0   0   0   0
LGD  58  35  62  36 /  20  10   0   0
GCD  58  29  63  34 /  10  10   0   0
DLS  67  43  68  44 /  10  10   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FREEZE WARNING FROM 10 PM THIS EVENING TO 9 AM PDT WEDNESDAY
     ORZ511.

WA...WIND ADVISORY UNTIL 5 PM PDT THIS AFTERNOON WAZ026.

&&

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

$$

94/77/98






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