268  
FXUS66 KPDT 210512  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
1012 PM PDT SAT JUL 20 2019  
 
UPDATED AVIATION DISCUSSION  
   
SHORT TERM...TONIGHT AND SUNDAY
 
WESTERLY FLOW OVER THE REGION IS  
TRANSITIONING TO A BUILDING RIDGE OF HIGH PRESSURE. SKIES WILL  
REMAIN CLEAR OVERNIGHT SUNDAY AND CONDITIONS DRY. TEMPERATURES WILL  
BE A LITTLE WARMER OVERNIGHT AND ON SUNDAY. ONLY MADE MINOR TWEAKS  
TO OVERNIGHT WINDS AND TEMPERATURES IN THE EVENING FORECAST UPDATE.  
   
AVIATION...06Z TAFS
 
CLEAR SKIES THROUGH MIDDAY SUNDAY, THEN FEW-  
SCT CIRRUS IMPACTING KRDM AND KBDN. WINDS REMAIN MAINLY UNDER 10  
KTS.  
 

 
   
PREV DISCUSSION
 
/ISSUED 223 PM PDT SAT JUL 20 2019/  
 
SHORT TERM...TONIGHT THROUGH TUESDAY EVENING. HIGH PRESSURE WILL  
DOMINATE THE AREAS WEATHER WITH MAINLY DRY CONDITIONS THROUGH  
TOMORROW AND A WARMING TREND IS EXPECTED INTO THE BEGINNING OF  
NEXT WEEK. SOME MOISTURE MAY WORK ITS WAY INTO PORTIONS OF THE  
REGION THAT INCLUDES THE OREGON CASCADES AND ALONG THE  
BLUE/WALLOWA MOUNTAINS MONDAY AND TUESDAY AFTN/EVE AND ISOLD TSRA  
ARE POSSIBLE. OTHERWISE PRESSURE GRADIENTS TIGHTEN SOME AND BREEZY  
CONDITIONS ARE POSSIBLE TUESDAY AFTERNOON.  
 
AFTERNOON TEMPERATURES ON SUNDAY SHOULD WARM INTO THE LOW 90S  
ACROSS THE COLUMBIA BASIN AND THEN CLIMB EVEN HIGHER MONDAY AND  
TUESDAY PRIOR TO THE ARRIVAL OF A MARINE PUSH OF COOLER AIR  
EXPECTED THEREAFTER.  
 
LONG TERM...WEDNESDAY THROUGH SATURDAY...WEDNESDAY WILL KNOCK ABOUT  
10 DEGREES OFF TUESDAY'S HIGHS WITH CONTINUED BREEZINESS, ESPECIALLY  
THROUGH AND DOWNWIND OF GAPS THROUGH THE CASCADES UNDER THE  
INFLUENCE OF A MARINE AIR BUT THESE SHOULD WEAKEN THROUGH THE EARLY  
AFTERNOON BEFORE SEEING SOME RESTRENGTHENING, MOSTLY IN THE GORGE  
AND KITTITAS VALLEY AS CROSS MOUNTAIN THERMAL GRADIENTS INCREASE  
LATE IN THE DAY. MAY STILL SEE A FEW LINGERING SHOWERS OVER WALLOWA  
COUNTY IN THE MORNING, BUT BULK OF STRONGER ASCENT TO KEEP ELEVATED  
CONVECTION GOING WILL BE EXITING TO THE NORTHEAST. THE REMAINDER OF  
THE FORECAST LOOKS DRY WITH A GRADUAL WARM-UP INTO FRIDAY WITH MODEL  
CONSENSUS KEEPING WEAK RIDGING OVERHEAD THROUGH AT LEAST THEN.  
OUTSIDE OF SOME WEAK DIURNAL RESPONSE THROUGH AND DOWNWIND OF GAPS  
THROUGH THE CASCADES, WINDS WILL BECOME MOSTLY LIGHT THURSDAY  
THROUGH SATURDAY MORNING. THE NEXT SYSTEM LOOKS TO APPROACH SATURDAY  
AFTERNOON IN THE FORM OF YET ANOTHER SHORTWAVE TROUGH ROTATING  
AROUND A GULF OF ALASKA LOW. MODELS AREN'T TERRIBLY BULLISH ON THE  
SOUTHERLY COMPONENT OF THE FLOW AHEAD OF THIS BRINGING IN SOME  
QUALITY MID-LEVEL LAPSE RATES OUT OF THE GREAT BASIN AND MOISTURE  
DOES APPEAR QUITE LIMITED, SO HAVE LEFT ANY MENTION OF THUNDERSTORMS  
OUT OF THE FORECAST FOR NOW. HAVE BUMPED THE WINDS UP FOR SATURDAY  
THOUGH WITH ANOTHER MARINE PUSH. WITH ANOTHER STRETCH OF WARM  
TEMPERATURES PRIOR TO ARRIVAL OF STRONGER WINDS, WILL LIKELY SEE  
SOME DIFFICULTY CONTROLLING ANY FIRE STARTS SATURDAY NIGHT, BUT  
STILL TOO FAR OUT TO TELL IF THE STRONGEST WINDS WILL COINCIDE WITH  
LOWEST RHS FOR ANY FIRE WEATHER HIGHLIGHTS. PECK  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 53 90 60 94 / 0 0 10 10  
ALW 55 95 64 98 / 0 0 10 10  
PSC 56 94 65 98 / 0 0 0 0  
YKM 53 92 62 96 / 0 0 0 0  
HRI 53 94 63 98 / 0 0 0 0  
ELN 51 90 61 94 / 0 0 0 0  
RDM 45 89 55 91 / 0 0 10 0  
LGD 47 89 61 91 / 0 0 10 10  
GCD 51 95 59 96 / 0 0 10 10  
DLS 59 93 66 92 / 0 0 0 0  
 

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

 
 

 
 
91/91/91  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab OR Page
The Nexlab WA Page Main Text Page