254  
FXUS66 KPDT 282123  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
223 PM PDT WED JUN 28 2017  
   
SHORT TERM...TONIGHT THROUGH SATURDAY
 
THE FORECAST AREA REMAINS  
BETWEEN AN OFFSHORE RIDGE AND A TROUGH CENTERED IN ALBERTA. THIS IS  
KEEPING A DRY NORTHWESTERLY FLOW OVER THE AREA. SOME OF THE MODELS  
SHOW A FEW THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING OVER THE  
WALLOWA MOUNTAINS AND FAR SOUTHEASTERN WALLOWA COUNTY. WEBCAMS SHOW  
SOME CUMULUS BUILDING OVER THE WALLOWA MOUNTAINS SO HAVE KEPT  
ISOLATED THUNDERSTORMS THERE THOUGH I AM EXPECTING THAT IT WILL  
REMAIN OUT OF THE WALLOWA VALLEY. SATELLITE IMAGERY SHOWS A WAVE  
HEADING SOUTH THROUGH THE TROUGH AND NEARING THE BRITISH COLUMBIA-  
WASHINGTON BORDER. MODELS ARE SUGGESTING THAT DURING THIS EVENING  
THE WAVE WILL BRUSH THE EASTERN PORTION OF THE AREA AND A  
THUNDERSTORM OR TWO MAY BE POSSIBLE IN THE EARLY EVENING AND SHOWERS  
LATER IN THE EVENING AROUND DAYTON AND IN THE NORTHERN BLUE  
MOUNTAINS. HAVE ISOLATED SHOWERS AND THUNDERSTORMS THERE. DO NOT  
EXPECT ANY STORMS WILL GET INTO WALLA WALLA. BREEZY WINDS OF 10 TO  
20 MPH WITH 20 TO 30 MPH IN THE COLUMBIA GORGE AND THE KITTITAS  
VALLEY WILL CONTINUE INTO THIS EVENING. WINDS WILL DECREASE  
OVERNIGHT. LOWS TONIGHT WILL BE IN THE 50S TO LOWER 60S WITH 40S IN  
THE MOUNTAINS. TOMORROW THE TROUGH WILL BE MOVING EAST AND THE RIDGE  
WILL MOVE CLOSER TO THE COAST. THE TROUGH WILL THEN MOVE OVERHEAD ON  
FRIDAY. SUNNY AND FAIR WEATHER IS EXPECT THURSDAY AND FRIDAY. WINDS  
WILL BE LIGHT GENERALLY THOUGH ON FRIDAY AFTERNOON, THE COLUMBIA  
GORGE AND KITTITAS VALLEY WILL SEE WINDS INCREASE TO 10 TO 20 MPH.  
TEMPERATURES WILL BE WARMING WITH HIGHS THURSDAY IN THE MID TO UPPER  
80S AND IN THE MID 70S TO LOWER 80S IN THE MOUNTAINS. FRIDAY WILL  
REACH THE UPPER 80S TO MID 90S WITH MAINLY 80S IN THE MOUNTAINS. ON  
LATE FRIDAY NIGHT AND SATURDAY A WEAK FRONT AND TROUGH WILL CROSS  
THE AREA AND A SLIGHT CHANCE OF THUNDERSTORMS WILL BE POSSIBLE OVER  
THE WALLOWA MOUNTAINS AND EASTERN WALLOWA COUNTY. WINDS WILL BE  
BREEZY TO WINDY SATURDAY AFTERNOON AND EVENING. TEMPERATURES WILL  
COOL 2 TO 5 DEGREES WITH HIGHS IN THE UPPER 80S TO MID 90S AND IN  
THE UPPER 70S TO MID 80S IN THE MOUNTAINS. PERRY  
   
LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY
 
MAINLY ZONAL DRY  
UPPER LEVEL FLOW WITH OCCASIONAL WEAK TROUGHS AND RIDGES WILL  
PERSIST THROUGH THE LONG TERM PERIOD. WEAK RIDGING WILL MOVE THROUGH  
WA AND OR SATURDAY NIGHT AND SUNDAY. BROAD TROUGHING WILL BE OVER WA  
AND OR MONDAY AND TUESDAY. A DRY COLD FRONT WILL MOVE THROUGH THE  
AREA MONDAY AND MAY BRING BREEZY TO WINDY CONDITIONS IN THE COLUMBIA  
BASIN. CROSS CASCADE PRESSURE GRADIENTS WILL KEEP GAP WINDS IN THE  
KITTITAS VALLEY AND COLUMBIA RIVER GORGE TUESDAY. WEAK RIDGING WILL  
RETURN WEDNESDAY. HIGH TEMPERATURES IN LOWER ELEVATIONS WILL BE MID  
80S TO LOWER 90S UNDER RIDGING SUNDAY AND WEDNESDAY AND 80S AFTER  
THE DRY COLD FRONT MONDAY AND TUESDAY. COONFIELD  
 

 
   
AVIATION...0Z TAFS
 
VFR CONDITIONS WILL PERSIST AT ALL TAF SITES  
FOR THE NEXT 24 HOURS. WINDS WILL DECREASE DURING THE EVENING THEN  
BECOME LIGHT AND DIURNAL LATE TONIGHT AND THURSDAY. 76  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 54 84 59 90 / 0 0 0 0  
ALW 60 87 64 92 / 10 0 0 0  
PSC 58 88 61 95 / 0 0 0 0  
YKM 56 90 62 94 / 0 0 0 0  
HRI 56 87 59 93 / 0 0 0 0  
ELN 54 88 57 92 / 0 0 0 0  
RDM 41 86 48 91 / 0 0 0 0  
LGD 50 81 52 88 / 10 0 0 0  
GCD 47 85 53 93 / 0 0 0 0  
DLS 56 90 63 92 / 0 0 0 0  
 

 
   
PDT WATCHES/WARNINGS/ADVISORIES
 
 
OR...NONE.  
WA...NONE.  

 
 

 
 
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