Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 092308 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
408 PM PDT WED JUL 9 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH SATURDAY...A WEAK DISTURBANCE
CURRENTLY NEAR JOHN DAY OREGON WILL COMBINE WITH MONSOON MOISTURE
AND DAYTIME HEATING TO PRODUCE A FEW THUNDERSTORMS MAINLY OVER
GRANT...WALLOWA...AND UNION COUNTIES EARLY THIS EVENING.  THE SYSTEM
IS MOVING EAST AND THUNDERSTORMS WILL DIMINISH AROUND SUNSET.  A
SHORT WAVE RIDGE WILL PRODUCE DRY AND WARM CONDITIONS FOR THURSDAY.
ANOTHER BATCH OF MOISTURE WORKING NORTH WILL BRING A CHANCE FOR
THUNDERSTORMS MAINLY SOUTH OF REDMOND TO ENTERPRISE FRIDAY AND
SATURDAY.  GUSTY WINDS THIS EVENING IN THE COLUMBIA BASIN WILL
DECREASE AROUND MID EVENING. TEMPERATURES WILL AVERAGE ABOUT 5-7
DEGREES ABOVE NORMAL ON THURSDAY AND FRIDAY AND THEN WARM TO NEARLY
10 DEGREES ABOVE NORMAL FOR SATURDAY WITH TRIPLE DIGITS LIKELY IN
THE COLUMBIA BASIN.

PENDLETON RADAR CONTINUES OUT OF SERVICE UNTIL AT LEAST LATE
THURSDAY.

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...THE PACIFIC
NORTHWEST WILL BE UNDER THE INFLUENCE OF A LARGE RIDGE THROUGHOUT
THE LONG TERM PERIOD. HEAT WILL BE THE MAIN STORY AS THE COLUMBIA
BASIN WILL GENERALLY BE IN THE UPPER 90S TO MID 100S WHILE THE REST
OF THE AREA WILL BE IN THE UPPER 80S AND 90S. INITIALLY THE RIDGE
WILL BE CENTERED OVER THE ROCKIES AND THIS WILL GIVE US A
SOUTHWESTERLY FLOW SATURDAY NIGHT THROUGH SUNDAY NIGHT. MOISTURE
WILL BE PULLED INTO THE SOUTHERN PORTION OF THE AREA AND THERE WILL
BE A SLIGHT CHANCE OF THUNDERSTORMS IN CENTRAL OREGON AND THE
OCHOCO-JOHN DAY HIGHLANDS SATURDAY EVENING. THE MOISTURE WILL REACH
FURTHER NORTH ON SUNDAY WITH A SLIGHT CHANCE OF THUNDERSTORMS AS FAR
NORTH AS FOSSIL AND UKIAH. ON MONDAY THE RIDGE FLATTENS A LITTLE AND
THE FLOW TURNS MORE WESTERLY. HAVE A SLIGHT CHANCE OF THUNDERSTORMS
IN THE EASTERN MOUNTAINS OF OREGON WHILE CENTRAL OREGON AND THE REST
OF THE AREA WILL REMAIN DRY. ON TUESDAY THE RIDGE IS CENTERED OVER
OUR AREA WITH A LIGHT NORTHWEST FLOW OVER THE REGION. WITH LITTLE
MOISTURE, HAVE REMOVED THUNDERSTORMS TUESDAY AFTERNOON AND EVENING.
ON WEDNESDAY THE THE UPPER FLOW TURNS EVEN MORE NORTH TO
NORTHWESTERLY AND AN INTRUSION OF MOISTURE PASSES OFF TO OUR EAST.
ENOUGH BRUSHES THE EASTERNMOST PORTION OF OUR AREA THAT I HAVE A
SLIGHT CHANCE OF THUNDERSTORMS IN THE NORTHERN BLUE MOUNTAINS AND
WALLOWA COUNTY, BUT DO NOT EXPECT THEM OVER THE REST OF THE AREA.
PERRY

&&

.AVIATION...00Z TAFS...FEW TO SCATTERED CLOUDS ABOVE 12000 FEET AGL
REMAIN OVER THE EASTERN HALF OF THE AREA THIS AFTERNOON AND SHOULD
CLEAR THIS EVENING. SKIES WILL REMAIN CLEAR THROUGH 00Z TOMORROW
AFTERNOON. WINDS WILL CONTINUE AT 10 TO 20 KTS AT KDLS AND 5 TO 15
KTS WITH HIGHER GUSTS ELSEWHERE FOR THE NEXT FEW HOURS BEFORE
DROPPING BELOW 12 KTS BY 05Z. WINDS WILL BEGIN TO INCREASE AGAIN
AFTER 16Z TOMORROW MORNING, REACHING 10 TO 20 KTS WITH GUSTS TO 25
KTS AT KDLS AND GENERALLY BELOW 15 KTS ELSEWHERE. PERRY

&&

.FIRE WX...A WEAK COLD FRONT THIS AFTERNOON WILL PUSH THE
THUNDERSTORM THREAT EASTWARD WHILE INCREASING WINDS ACROSS THE
COLUMBIA BASIN. MEANWHILE...RELATIVE HUMIDITY WILL REMAIN LOW SO RED
FLAG WARNINGS ARE IN EFFECT FOR THIS AREA SINCE CRITICALLY DRY FUELS
COULD RESULT IN RAPID FIRE SPREAD. IN GENERAL...WARM AND DRY
CONDITIONS WILL PREVAIL THROUGH THE WEEKEND...BUT THERE WILL ALSO BE
A SLIGHT CHANCE OF THUNDERSTORMS EACH DAY FRIDAY THROUGH MONDAY.
COBB


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  58  93  60  96 /   0   0   0   0
ALW  63  94  65  97 /   0   0   0   0
PSC  59  95  61  99 /   0   0   0   0
YKM  57  92  62  96 /   0   0   0   0
HRI  58  95  59  98 /   0   0   0   0
ELN  54  92  55  95 /   0   0   0   0
RDM  49  92  53  93 /   0   0  10  10
LGD  53  89  54  91 /  10   0  10   0
GCD  54  92  58  92 /  10  10  10  10
DLS  59  92  62  97 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING UNTIL 10 PM PDT THIS EVENING
     ORZ041-044-503-507-508-510.

WA...RED FLAG WARNING UNTIL 10 PM PDT THIS EVENING
     WAZ024-026>029-520-521.

&&

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

$$

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