918  
FXUS66 KPDT 180241  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
741 PM PDT TUE JUL 17 2018  
   
UPDATE
 
A WEAK MARINE PUSH CAUSED THE WINDS TO INCREASE THIS PAST  
AFTERNOON AND THIS EVENING. THE WINDS WILL DIMINISH AFTER SUNSET.  
THERE WAS LITTLE IN THE WAY OF WEATHER WITH THIS MARINE PUSH AND THE  
MAIN EFFECTS WILL BE COOLER TEMPERATURES ON WEDNESDAY THROUGH  
FRIDAY. PRECIPITATION WILL NOT EXIST AND THERE WILL BE ONLY A FEW  
CUMULUS AND A FEW HIGH CLOUDS. FORECAST THIS EVENING LOOKS GOOD AND  
NO UPDATES ARE NEEDED.  
 

 
   
AVIATION...06Z TAFS
 
VFR CONDITIONS WILL PREVAIL DURING THE NEXT  
24 HOURS AT ALL TAF SITES. BREEZY WINDS THIS EVENING WILL DIMINISH  
OVERNIGHT AS A MARINE PUSH CONTINUES TO PUSH EASTWARD AND EXIT TO  
THE EAST. 88  
 

 
   
PREV DISCUSSION
 
/ISSUED 157 PM PDT TUE JUL 17 2018/  
 
SHORT TERM...TONIGHT THROUGH FRIDAY...SATELLITE IMAGES SHOW THAT  
A FEW FAIR WEATHER CU HAVE DEVELOPED OVER THE MOUNTAINS FROM CROOK  
TO WALLOWA COUNTIES THIS AFTERNOON. THESE CLOUDS WILL DISSIPATE  
AROUND SUNSET. WEAK MARINE PUSH AND STRONG CROSS CASCADE PRESSURE  
GRADIENTS HAVE BROUGHT BREEZY TO WINDY CONDITIONS IN THE COLUMBIA  
BASIN AND ADJACENT AREAS THIS AFTERNOON. THESE WINDS WILL INCREASE  
MORE THIS EVENING. THE STRONGEST WINDS ARE EXPECTED IN THE COLUMBIA  
RIVER GORGE AND KITTITAS VALLEY. RED FLAG WARNINGS FOR WIND AND LOW  
RHS HAVE BEEN ISSUED FOR THESE AREAS.  
 
A DRY WESTERLY FLOW ALOFT WILL PERSIST OVER THE REGION THROUGH THE  
SHORT TERM PERIOD. THIS WILL KEEP MAINLY CLEAR SKIES OVER EASTERN WA  
AND OR. TEMPERATURES WILL COOL A FEW DEGREES EACH DAY. SURFACE  
GRADIENTS AND WESTERLY FLOW ALOFT WILL FAVOR CONTINUED BREEZY  
CONDITIONS EACH DAY, ESPECIALLY IN THE AFTERNOON AND EVENING.  
COONFIELD  
 
LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...A FAIRLY PERSISTENT DRY  
WESTERLY FLOW WILL CONTINUE THROUGH THE EXTENDED WITH NO  
PRECIPITATION EXPECTED. AN UPPER LEVEL LOW MOVING EASTWARD THROUGH  
SOUTHWEST CANADA OVER THE WEEKEND WILL PRODUCE SOME BREEZY  
CONDITIONS AND SLIGHTLY LOWER TEMPERATURES BACK TO NEAR NORMAL FOR  
THIS TIME OF YEAR. BY FIRST OF THE WEEK, TEMPERATURES WILL AGAIN  
BEGIN TO WARM TO SLIGHTLY ABOVE NORMAL.  
 
FIRE WEATHER...THE RED FLAG WARNING WAS EXPANDED TO INCLUDE ALL OF  
THE WASHINGTON LOWER COLUMBIA BASIN IN EFFECT UNTIL 8 PM WEDNESDAY  
EVENING--THE SAME TIME AS THE OTHER WARNINGS IN AND AROUND THE  
COLUMBIA BASIN DOWN TO CENTRAL OREGON. WINDS ARE INCREASING WITH  
GUSTS TO 20-25 MPH IN MANY AREAS. THE RELATIVE HUMIDITY GENERALLY  
RANGES FROM 10 TO 20 PERCENT. AS WINDS INCREASE AND THE HUMIDITY  
DECREASES OVER THE NEXT SEVERAL HOURS, THE RED FLAG CONDITIONS WILL  
BE MET. ALTHOUGH WINDS WILL DECREASE OVERNIGHT, THERE WILL BE  
LINGERING WINDS IN THE 10-20 MPH RANGE THROUGH EARLY WEDNESDAY  
MORNING. ONCE AGAIN, GUSTS TO 20-25 MPH ARE LIKELY AGAIN WEDNESDAY  
AFTERNOON AND EVENING AND A FEW AREAS THROUGH THE COLUMBIA RIVER  
GORGE AND KITTITAS VALLEY WILL HAVE GUSTS TO 35 MPH. UNFORTUNATELY,  
THE WIND AND RH THREAT WILL CONTINUE THROUGH THE END OF THE WEEK. IT  
MAY BE LOCALLY BREEZY ON THURSDAY AND BREEZY/WINDY ON FRIDAY. WILL  
ADDRESS THE UPCOMING WINDS ON FRIDAY AFTER THE EXPIRATION OF THE  
CURRENT WARNINGS. WISTER  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 64 95 61 91 / 0 0 0 0  
ALW 67 96 62 92 / 0 0 0 0  
PSC 65 97 62 93 / 0 0 0 0  
YKM 62 94 59 89 / 0 0 0 0  
HRI 67 98 63 95 / 0 0 0 0  
ELN 62 91 59 87 / 0 0 0 0  
RDM 53 91 50 91 / 0 0 0 0  
LGD 55 91 50 89 / 0 0 0 0  
GCD 59 91 55 91 / 0 0 0 0  
DLS 66 90 63 88 / 0 0 0 0  
 

 
   
PDT WATCHES/WARNINGS/ADVISORIES
 
 
OR...RED FLAG WARNING UNTIL 8 PM PDT WEDNESDAY FOR ORZ610-639>641.  
 
HEAT ADVISORY UNTIL 9 PM PDT THIS EVENING FOR ORZ044-507.  
 
WA...RED FLAG WARNING UNTIL 8 PM PDT WEDNESDAY FOR WAZ639-641-675.  
 
HEAT ADVISORY UNTIL 9 PM PDT THIS EVENING FOR WAZ026>029.  
 

 
 

 
 
88/91/88  
 
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