Weather Service Report


655 
FXUS66 KPDT 032240 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR 
340 PM PDT MON AUG 3 2015

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH THURSDAY...REMNANTS OF MOISTURE MOVING 
ACROSS THE REGION WILL CONTINUE TO BRING A THREAT OF LIGHT SHOWERS 
AND OR THUNDERSTORMS TO CENTRAL AND NORTHEAST OREGON THIS EVENING 
AND THE TAPPER OFF TO JUST A FEW SHOWERS OVER THE EASTERN MOUNTAINS 
OVERNIGHT. THE UPPER LEVEL LOW ALONG THE CANADIAN COAST WILL BEGIN TO 
DOMINATE THE WEATHER PATTERN FOR THE FORECAST AREA ON TUESDAY AS WE 
TRANSITION TO A MORE WESTERLY FLOW. THIS WILL SHIFT THE MOISTURE 
EAST AND SOUTH LEAVING JUST A SLIGHT CHANCE OF SHOWERS AND OR 
THUNDERSTORMS SOUTH OF A LINE FROM LAPINE TO ENTERPRISE TUESDAY 
AFTERNOON AND EVENING. THE LOW WILL SETTLE OVER SOUTHERN BRITISH 
COLUMBIA ON WEDNESDAY AND THEN SHIFT EAST INTO ALBERTA ON THURSDAY. 
THESE ARE LIKELY TO BE THE COOLEST DAYS THIS WEEK. WESTERLY FLOW 
OVER THE FORECAST AREA DURING THIS TIME FAVORS A DRY FORECAST BUT 
COULD SEE SOME SHOWERS ALONG THE WASHINGTON CASCADE CREST ON 
WEDNESDAY. EXPECT SOME BREEZY WESTERLY WINDS THROUGH WEDNESDAY WHICH 
WILL BE A FIRE WEATHER CONCERN AND ADDRESSED IN THAT SECTION.
 
 

.LONG TERM...THURSDAY NIGHT THROUGH SUNDAY NIGHT...WESTERLY FLOW 
THURSDAY WILL SHIFT TO THE SOUTHWEST ON FRIDAY EVENING.  EXPECT 
CONDITIONS TO BE MOSTLY DRY THURSDAY NIGHT...WITH INCREASING CHANCES 
OF PRECIPITATION BY FRIDAY EVENING...MAINLY OVER THE CENTRAL OREGON 
AREA.  DISTURBANCE TO THE SOUTH WILL INCREASE MOISTURE OVER THE 
CENTRAL AND NORTHEAST OREGON AREAS ON FRIDAY NIGHT INTO SATURDAY.  
MODELS HAVE DIFFERENT SOLUTIONS AFTER THIS TIME PERIOD...WITH 
ANOTHER LOW PRESSURE SYSTEM MOVING IN FROM THE GULF OF ALASKA.  GFS 
MODEL IS KEEPING MOST OF THE PRECIPITATION TO THE CENTRAL AND 
NORTHEAST OREGON...WHILE THE ECMWF CONTINUES THE TROUGH OF LOW 
PRESSURE FURTHER SOUTH OFF THE COAST OF OREGON...PROVIDING MORE 
WIDESPREAD MOISTURE TO THE AREA.  OVERALL HAVE GONE WITH SLIGHT 
CHANCE TO CHANCE SHOWERS AND THUNDERSTORMS THROUGH THE END OF THE 
WEEKEND.  TEMPERATURES SHOULD BE IN THE UPPER 80S TO LOWER 90S FOR 
THE TIME PERIOD. WEBER


&&

.AVIATION...00Z TAFS...VFR CONDITIONS WILL PREVAIL DURING THE NEXT 
24 HOURS AT ALL TAF SITES. THERE MAY BE BRIEF MVFR AT KBDN AND KRDM 
THIS AFTERNOON DUE TO SHOWERS.  THUNDERSTORMS CURRENTLY ABOUT 30 
MILES SSW OF KBDN AND MOVING VERY SLOWLY.  WILL MONITOR AND UPDATE 
THE TAFS AS THEY NEAR.  WINDS WILL INCREASE FROM THE WEST MAINLY IN 
THE LOWER COLUMBIA BASIN AND THE GORGE AREA.  EXPECT WINDS TO BE 15-
25KTS.  SKIES WILL BEGIN TO CLEAR AT MOST SITES BETWEEN 6-10Z. WINDS 
WILL PICK UP AGAIN TOMORROW AFTERNOON BUT SHOULD ONLY GUST TO ABOUT 
20KTS.  SMOKE FROM A WILDFIRE OVER THE BLUE MOUNTAINS MAY INVADE 
INTO THE KALW AREA OVERNIGHT...DUE TO DRAINAGE SOUTHEAST WINDS UNDER 
THE INVERSION.  WEBER

&&

.FIRE WEATHER...RED FLAG WARNINGS ARE IN EFFECT FOR THE LOWER 
COLUMBIA BASIN AND AREAS NEAR THE EASTERN COLUMBIA RIVER GORGE 
THROUGH TUESDAY EVENING. WINDS HAVE INCREASED THIS AFTERNOON 
COMPARABLE TO THE FORECAST...BUT RH'S ARE HIGHER THAN WE PREVIOUSLY 
ANTICIPATED DUE TO OVERCAST MID LEVEL CLOUDS KEEPING COOLER 
TEMPERATURES ACROSS THE REGION. THERE SHOULD BE SOME CLEARING OVER 
THE NEXT COUPLE OF HOURS WHICH COULD CAUSE A SIGNIFICANT DROP IN RH 
VALUES. TUESDAY WILL BE BREEZY TO WINDY WITH LOW RH'S IN THE WARNING 
AREAS.  THE WARNING MAY NEED TO BE EXTENDED INTO WEDNESDAY...AS 
CONDITIONS WILL BE SIMILAR. THE DECISION ON WHETHER OR NOT TO EXTEND 
THE WARNING WILL BE MADE TOMORROW. AS FAR AS THE THUNDERSTORM 
THREAT...THE LIGHTNING ACTIVITY SHOULD BE MINIMAL THIS EVENING AND 
ON TUESDAY AND MAINLY FROM THE OCHOCO MOUNTAINS SOUTHWARD.  WISTER


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  64  90  60  85 /  10  10   0   0 
ALW  68  92  66  86 /  10  10   0  10 
PSC  64  94  62  90 /  10   0   0   0 
YKM  62  88  59  84 /  10   0   0   0 
HRI  64  93  61  88 /  10   0   0   0 
ELN  65  87  60  83 /  10   0   0   0 
RDM  50  87  48  82 /  20  10  10   0 
LGD  55  88  53  82 /  20  10  10  10 
GCD  56  91  55  86 /  20  10  10  10 
DLS  67  88  63  85 /  10   0   0   0 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING UNTIL 9 PM PDT TUESDAY FOR ORZ639-641.

WA...RED FLAG WARNING UNTIL 9 PM PDT TUESDAY FOR WAZ639-641-675.

&&

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

$$

91/89/89

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