749  
FXUS66 KPDT 292335  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
435 PM PDT WED MAY 29 2024  
 
UPDATED AVIATION DISCUSSION  
   
SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT
 
ISOLATED TO  
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL DIMINISH THROUGH  
THIS EVENING AS AN UPPER-LEVEL TROUGH EXITS TO THE EAST AND AN  
OFFSHORE UPPER-LEVEL RIDGE INFLUENCES THE REGION'S WEATHER.  
 
DRY CONDITIONS ARE EXPECTED (95-100% CHANCE) OVERNIGHT THROUGH  
FRIDAY EVENING. LOCALLY BREEZY WINDS ARE EXPECTED TO REMAIN  
THROUGH THE CASCADE GAPS OVERNIGHT THROUGH THURSDAY WITH LIGHTER  
WINDS ELSEWHERE. A BRIEF SWITCH TO LIGHT OFFSHORE WINDS IS  
FORECAST FRIDAY AS THE UPPER-LEVEL RIDGE AXIS MOVES OVERHEAD.  
 
ENSEMBLE GUIDANCE IS THEN IN GOOD AGREEMENT (>95% CHANCE) THAT A  
WEAK SHORTWAVE TROUGH WILL APPROACH THE PACNW BY FRIDAY NIGHT  
WITH A REVERSAL TO ONSHORE WINDS ACCOMPANIED BY LOW (15-25%)  
CHANCES OF LIGHT PRECIPITATION ALONG THE WASHINGTON CASCADE CREST.  
PLUNKETT/86  
 

 
   
LONG TERM...SATURDAY THROUGH WEDNESDAY
 
SATURDAY WILL SEE A WEAK  
UPPER LEVEL TROUGH PASSING OVER THE REGION. MAIN IMPACT WILL BE  
SOME INCREASING WESTERLY WINDS OF 15 TO 25 MPH WITH HIGHER GUSTS.  
PRECIPITATION WILL BE LIMITED MAINLY TO THE CASCADE CREST AND OVER  
THE FAR EASTERN MOUNTAINS. THIS INCLUDES A SLIGHT CHANCE OF  
THUNDERSTORMS OVER WALLOWA COUNTY.  
 
A DEEPENING UPPER LEVEL TROUGH IN THE GULF OF ALASKA ON SUNDAY  
WILL BRING THE NEXT WEATHER SYSTEM FURTHER SOUTH LATE SUNDAY AND  
MONDAY. THIS WILL START OFF WITH A WEAK WARM FRONT CLIPPING THE  
FORECAST AREA SUNDAY NIGHT WITH SOME LOW CHANCE POPS FOLLOWED BY A  
COLD FRONTAL PASSAGE ON MONDAY. THIS SYSTEM WILL ONCE AGAIN  
INCREASE WESTERLY WINDS ON MONDAY BUT COULD ALSO SEE SOME  
MEANINGFUL PRECIPITATION OF A QUARTER TO HALF AN INCH ACROSS THE  
LOWER ELEVATIONS AND HALF AN INCH TO AROUND AN INCH IN THE  
MOUNTAINS BEFORE THE WINDS KICK IN.  
 
DETERMINISTIC MODELS DRY THINGS OUT RAPIDLY ON TUESDAY BUT THE NBM  
KEEPS SOME LINGERING SHOWERS BEFORE TURNING DRY ON WEDNESDAY.  
EXPECT THIS TO GET RESOLVED AFTER A FEW MORE MODEL RUNS.  
 

 
   
AVIATION...00Z TAFS
 
SMOKE HAS BEEN OBSERVED AT RDM AND BDN AND  
CAN ALSO BE SEEN ON VISIBLE SATELLITE AND WEB CAMS. AS THE MIXING  
HEIGHTS LOWER CLOSER TO THE SURFACE WINDS DECREASE TONIGHT, THE  
TERMINAL AIRPORTS WILL BE MORE SUSCEPTIBLE TO MVFR OR LESS  
VISIBILITY. OTHERWISE, SKIES ARE MOSTLY CLEAR WITH FEW-SCT MID AND  
HIGH LEVEL CLOUDS. BREEZY WESTERLY WINDS GUSTING TO 25-35 KT WILL  
DECREASE TONIGHT AND WILL BE LIGHT AND TERRAIN DRIVEN BY EARLY  
THURSDAY MORNING. WISTER/85  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 39 67 42 75 / 10 0 0 0  
ALW 44 70 45 77 / 20 0 0 0  
PSC 45 74 48 80 / 20 0 0 0  
YKM 37 72 41 78 / 0 0 0 0  
HRI 43 73 44 80 / 10 0 0 0  
ELN 40 67 42 77 / 0 0 0 0  
RDM 34 69 38 78 / 0 0 0 0  
LGD 37 64 39 74 / 10 0 0 0  
GCD 36 67 39 78 / 0 0 0 0  
DLS 44 73 47 81 / 0 0 0 0  
 

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

 
 

 
 
SHORT TERM...86  
LONG TERM....91  
AVIATION...85  
 
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