550  
FXUS66 KPDT 222132  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
232 PM PDT FRI JUN 22 2018  
   
SHORT TERM...TONIGHT THROUGH MONDAY
 
AN UPPER LEVEL TROUGH AND  
COLD FRONT HAS MOVED ACROSS THE CASCADE CREST THIS AFTERNOON AND  
WILL MOVE THROUGH THE AREA TONIGHT AND AND TOMORROW MORNING. THE  
FRONT IS PRETTY DRY SO DO NOT EXPECT MUCH EXCEPT A SLIGHT CHANCE OF  
SHOWERS ALONG THE WASHINGTON CASCADE CREST. THE MAIN CONCERN WILL BE  
WINDS AS PRESSURE GRADIENTS HAVE TIGHTENED UP ALONG THE CASCADES.  
WINDS WILL REACH 25 TO 35 MPH WITH GUSTS TO 45 MPH IN THE COLUMBIA  
GORGE AND 30 TO 40 MPH WITH GUSTS TO 50 MPH IN THE KITTITAS VALLEY  
LATER THIS AFTERNOON AND EARLY EVENING. WIND ADVISORIES REMAIN IN  
EFFECT THROUGH 9 PM TONIGHT FOR THE COLUMBIA GORGE AND KITTITAS  
VALLEY. THE COLUMBIA BASIN AND CENTRAL OREGON WILL SEE 15 TO 30 MPH  
WINDS. WINDS WILL DECREASE TONIGHT THOUGH THE COLUMBIA GORGE WILL  
REMAIN AROUND 15 MPH AND THE KITTITAS VALLEY AT AROUND 20 MPH. SMOKE  
FROM WILDFIRES IN CENTRAL AND NORTH CENTRAL OREGON CONTINUE TO  
CREATE HAZY CONDITIONS, THOUGH LESS NOTICEABLE THAN THIS MORNING.  
HAVE KEPT PATCHY SMOKE THROUGH TONIGHT OVER THE OREGON PORTION OF  
THE AREA AND IN THE WASHINGTON BLUE MOUNTAIN FOOTHILLS. AS THE  
TROUGH DEPARTS TO THE EAST TOMORROW, HIGH PRESSURE WILL BUILD  
OFFSHORE AND SLOWLY MOVE ACROSS THE AREA THROUGH SUNDAY AFTERNOON.  
THIS WILL GIVE US DRY AND MOSTLY CLEAR WEATHER WITH LIGHTER WINDS.  
SUNDAY NIGHT ANOTHER TROUGH WILL MOVE TO THE COAST AND THEN COME  
ASHORE ON MONDAY. THIS WILL BE SIMILAR TO TODAY'S TROUGH WITH ONLY A  
SLIGHT CHANCE OF SHOWERS ALONG THE WASHINGTON CASCADE CREST AND  
BREEZY TO WINDY CONDITIONS ON MONDAY. WIND ADVISORIES MAY BE NEEDED  
THEN. TEMPERATURES TOMORROW WILL BE SIMILAR TO TODAY WITH HIGHS IN  
LOWER TO MID 80S AND MAINLY IN THE 70S IN THE MOUNTAINS. WITH THE  
RIDGE OVERHEAD, SUNDAY WILL BE IN THE UPPER 80S AND LOWER 90S WITH  
MID 70S TO MID 80S IN THE MOUNTAINS. THE TROUGH ON MONDAY WILL COOL  
TEMPERATURES BACK TO THE UPPER 70S TO MID 80S AND MAINLY IN THE 70S  
IN THE MOUNTAINS. PERRY  
   
LONG TERM
 
MONDAY NIGHT THROUGH FRIDAY. A LOW PRESSURE SYSTEM OVER  
WESTERN CANADA WILL TIGHTEN PRESSURE GRADIENTS OVER THE PACNW AND  
BREEZY TO WINDY CONDITIONS ARE POSSIBLE MONDAY NIGHT. OTHERWISE DRY  
CONDITIONS ARE EXPECTED INTO THE MIDDLE OF THE WORK WEEK. A  
DISTURBANCE WILL APPROACH THE TWO STATE AREA WEDNESDAY NIGHT THAT  
COULD BRING SOME SHOWERS ALONG THE EAST SLOPES OF THE WA CASCADES  
AND LATER TO THE BLUE/WALLOWA MTNS ON THURSDAY AND FRIDAY.  
TEMPERATURES THROUGH THE PERIOD WILL BE NEAR NORMAL AND INTO THE 80S  
WITH 70S MOUNTAINS.  
 

 
   
AVIATION...00Z TAFS
 
LCL WIND GUSTS TO 30 KTS IS POSSIBLE AT ALL  
TAF SITES UNTIL 03Z. OTHERWISE SOME SMOKE IS POSSIBLE NEAR TAF SITES  
KPDT...KALW AND KRDM AND KBDN BUT VFR CONDITIONS WILL PERSIST AT ALL  
TAF SITES FOR THE NEXT 24 HOURS.  
 
156  

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 55 83 55 90 / 0 0 0 0  
ALW 56 85 58 93 / 10 0 0 0  
PSC 58 86 57 93 / 10 0 0 0  
YKM 53 83 54 89 / 0 0 0 0  
HRI 58 87 57 94 / 0 0 0 0  
ELN 55 81 53 89 / 10 0 0 0  
RDM 46 80 47 92 / 0 0 0 0  
LGD 49 75 49 85 / 0 10 10 0  
GCD 49 76 49 86 / 0 10 0 0  
DLS 59 83 58 93 / 0 0 0 0  
 

 
   
PDT WATCHES/WARNINGS/ADVISORIES
 
 
OR...WIND ADVISORY UNTIL 9 PM PDT THIS EVENING FOR ORZ041.  
 
WA...WIND ADVISORY UNTIL 9 PM PDT THIS EVENING FOR WAZ024-026.  
 

 
 

 
 
83/97/97  
 
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