Weather Service Report


431 
FXUS66 KPDT 222126
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 PM PDT TUE JUL 22 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY. THUNDERSTORMS STARTING TO 
DEVELOP ACROSS CENTRAL AND NORTHEAST OREGON THIS AFTERNOON. AIRMASS 
BECOMING MORE UNSTABLE NOW AS MID AND HIGH LEVEL CLOUDS CLEAR. ALSO 
LIFT WILL BE INCREASING THROUGH THE AFTERNOON AND EVENING IN 
RESPONSE TO APPROACHING CALIFORNIA SHORT WAVE AND JET STREAK. BASED 
ON THIS EXPECT COVERAGE OF SHOWERS AND STORMS TO INCREASE THROUGH 
THE AFTERNOON AND CONTINUE INTO THE EVENING AS THEY MOVE NORTHWARD. 
JET DYNAMICS WILL LIKELY RESULT IN SOME STRONGER STORMS WITH HAIL 
AND WIND. PRECIPITATION SHOULD DIMINISH FOR A WHILE LATER TONIGHT 
BEFORE INCREASING AGAIN WEDNESDAY AS A LARGE UPPER LOW MOVES INTO 
THE PACIFIC NORTHWEST. EXPECT ADDITIONAL SHOWERS AND THUNDERSTORMS 
TO MOVE THROUGH THE AREA. MODELS HAVE BEEN CONSISTENT SHOWING SOME 
HEAVIER RAIN POSSIBLE OVER THE WASHINGTON CASCADES AND EAST SLOPES. 
AS THE LOW MOVES INLAND WINDS WILL BE INCREASING BECOMING BREEZY BY 
AFTERNOON. BASED ON THE STRENGTH OF THE LOW LEVEL COLD ADVECTION 
MANY AREAS MAY SEE THERE HIGHS EARLY IN THE DAY WITH TEMPERATURES 
BECOMING STEADY IN THE AFTERNOON. PRECIPITATION WILL DIMINISH 
WEDNESDAY NIGHT AS THE LOW MOVES OFF TO THE EAST. A DRY WESTERLY 
FLOW ALOFT THURSDAY WITH MOSTLY SUNNY SKIES, COOLER TEMPERATURES AND 
BREEZY CONDITIONS. WESTERLY FLOW CONTINUES INTO FRIDAY WITH ANOTHER 
SUNNY DAY. TEMPERATURES WILL BE WARMER WITH LESS WIND. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY. HIGH PRESSURE OVER THE SW 
UNITED STATES WILL RIDGE NORTH AND INFLUENCE THE REGIONS WEATHER 
WITH DRY CONDITIONS INTO THE WEEKEND ALONG WITH WARMER TEMPERATURES. 
SOME MOISTURE MOVES UP INTO THE OREGON CASCADES MONDAY AFTERNOON 
THAT COULD PRODUCE ISOLD TSRA OVER THIS AREA INTO THE EVENING. 
OTHERWISE THE DRY CONDITIONS WILL PERSIST INTO NEXT WEEK. 

&&

.AVIATION...LCL MVFR CONDITIONS WILL PERSIST ACROSS ALL TAF SITES 
AND ESPECIALLY OVER CENTRAL OREGON UNTIL 04Z. SHOWERS AND 
THUNDERSTORMS IN AND NEAR TAF SITES WILL CREATE AREAS OF MVFR AND 
LCL IFR CONDITIONS. OTHERWISE CONDITIONS WILL IMPROVE TO MOSTLY VFR 
AFTER 10Z FOR ALL TAF SITES ONLY TO RETURN TO LCL MVFR CONDITIONS IN 
AND NEAR KYKM AFTER 15Z. 

&&

.FIRE WX...A LOW PRESSURE SYSTEM MOVING INTO THE REGION WILL CAUSE 
WIDESPREAD SHOWERS AND THUNDERSTORMS. ALTHOUGH SOME STORMS MAY 
PRODUCE WETTING RAIN...ABUNDANT LIGHTNING CAN BE EXPECTED WHICH 
COULD START NEW FIRES IN VERY DRY FUELS. STORMS HAVE BEGUN 
DEVELOPING OVER CENTRAL OREGON AND THE NORTHEAST MOUNTAINS AND WILL 
MOVE NORTH INTO THE LOWER COLUMBIA BASIN. SCATTERED THUNDERSTORMS 
COULD POTENTIALLY LAST THROUGH THE NIGHT IN SOME PLACES. AS THE LOW 
MOVES INLAND WEDNESDAY...OCCASIONAL SCATTERED THUNDERSTORMS WILL 
AGAIN BE POSSIBLE THROUGH THE EVENING. RED FLAG WARNINGS THEREFORE 
REMAIN IN EFFECT.  COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  62  81  53  78 /  40  40  20  10 
ALW  65  84  56  79 /  50  40  20  10 
PSC  64  84  56  82 /  30  30  20  10 
YKM  62  77  53  77 /  30  50  20  10 
HRI  64  83  55  80 /  30  30  20  10 
ELN  59  74  50  73 /  30  60  30  10 
RDM  55  74  42  74 /  50  30  20   0 
LGD  57  82  50  72 /  60  40  30  10 
GCD  57  83  45  75 /  60  30  20  10 
DLS  64  73  56  78 /  30  40  30  10 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING UNTIL 11 PM PDT WEDNESDAY 
     ORZ041-044-049-050-502-503-505>508-510.

     RED FLAG WARNING UNTIL 5 PM PDT WEDNESDAY ORZ509-511.

WA...RED FLAG WARNING UNTIL 11 PM PDT WEDNESDAY 
     WAZ024-026>030-520-521.

&&

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

$$

94/97/97/82



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