535 
FXUS66 KPDT 300407 AAA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
858 PM PDT TUE SEP 29 2015

.UPDATE...HIGH PRESSURE CONTINUES TO DOMINATE THE AREA WITH DRY 
CONDITIONS AND MOSTLY CLEAR SKIES TONIGHT. OTHER THAN INCREASING 
OVERNIGHT TEMPS A DEGREE OR TWO...THE PRESENT SHORT TERM FORECAST 
APPEARS ON TRACK FOR NOW.

&&

.AVIATION...VFR CONDITIONS WILL PERSIST ACROSS ALL TAF SITES FOR THE 
NEXT 24 HOURS. 

&&

.PREV DISCUSSION... /ISSUED 200 PM PDT TUE SEP 29 2015/ 

SHORT TERM...FORECAST AREA WILL BE UNDER THE INFLUENCE OF AN UPPER 
LEVEL RIDGE OF HIGH PRESSURE THROUGH WEDNESDAY FOR CONTINUED WARM 
AND DRY CONDITIONS. THEN A WEAK UPPER LEVEL TROUGH OFF THE COAST 
WILL MOVE INLAND ON THURSDAY. THIS WILL USHER IN SOME COOLER AIR AND 
A LITTLE INSTABILITY OVER THE EASTERN MOUNTAINS. A FEW SHOWERS WILL 
BE POSSIBLE THURSDAY AFTERNOON AND EVENING OVER THE BLUE MOUNTAINS. 
THE TROUGH WILL EXIT FRIDAY LEAVING THE AREA UNDER A DRY 
NORTHWESTERLY FLOW WITH ANOTHER SYSTEM EXPECTED TO ARRIVE FRIDAY 
NIGHT. 

LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...UPPER LEVEL RIDGE IS 
EXPECTED TO BREAK DOWN AS A SYSTEM APPROACHES FROM BRITISH COLUMBIA. 
THIS SYSTEM WILL BRING A DECENT CHANCE FOR PRECIPITATION ACROSS THE 
ENTIRE FORECAST AREA FRIDAY NIGHT THROUGH SATURDAY NIGHT.  AS THE 
LOW MOVES SOUTH OVER CENTRAL OREGON SATURDAY EVENING...STRONG 
NORTHEAST GRADIENTS COULD SET UP...AND AS A RESULT HAVE INCREASED 
WINDS FOR THIS TIME PERIOD.  THE LOW WILL EXIT TO THE SOUTHEAST ON 
SUNDAY AFTERNOON...LEAVING A RESIDUAL CHANCE FOR SHOWERS ALONG 
CENTRAL OREGON AND THE NORTHEAST MOUNTAINS...WITH DRY CONDITIONS 
ELSEWHERE.  AS THE SYSTEM EXITS SUNDAY NIGHT...HIGH PRESSURE WILL 
REBUILD OVER THE PACIFIC NORTHWEST.  THIS WILL PROVIDE A DRY AND 
WARMING TREND FOR THE REST OF THE EXTENDED.  WEBER

AVIATION...00Z TAFS...VFR CONDITIONS TO PREVAIL OVER THE NEXT 24 
HOURS...WITH MOSTLY CLEAR SKIES AND WINDS LESS THAN 10 KTS. WEBER

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  47  76  45  75 /   0   0   0   0 
ALW  48  78  48  76 /   0   0   0   0 
PSC  43  80  43  79 /   0   0   0   0 
YKM  41  81  41  80 /   0   0   0   0 
HRI  43  79  43  79 /   0   0   0   0 
ELN  40  80  39  79 /   0   0   0   0 
RDM  36  76  34  74 /   0   0  10  10 
LGD  40  78  41  74 /   0   0   0  10 
GCD  42  79  41  75 /   0   0   0  10 
DLS  48  81  48  80 /   0   0  10   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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