894
FXUS66 KPDT 080505
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1005 PM PDT MON SEP 7 2026
KEY MESSAGES
- LOW CHANCE (<=30 PERCENT) OF SHOWERS THIS AFTERNOON AND
EVENING MAINLY OVER FAR EASTERN OREGON.
- BREEZY WINDS THIS AFTERNOON AND EVENING OVER THE COLUMBIA
BASIN, CASCADE GAPS, KITTITAS VALLEY AND SIMCOE HIGHLANDS.
- DRY AND WARMER TUESDAY THROUGH THURSDAY, THEN BREEZY THURSDAY
IN AS A WEAK TROUGH MOVES THROUGH IN ADVANCE OF THE NEXT
UPPER LOW WHICH WILL BRING THE POTENTIAL FOR MORE UNSETTLED
WEATHER TO THE MOUNTAINS OVER THE WEEKEND.
DISCUSSION
THE PERSISTENT UPPER LOW THAT HAD BEEN OVER THE PACIFIC
NORTHWEST HAS MOVED EASTWARD OUT OF THE REGION. HOWEVER,
LINGERING TROUGHING REMAINS AND A SECONDARY LOW/SHORT WAVE WILL
MOVE THOUGH THIS EVENING. THIS SHORT WAVE ENERGY COULD TOUCH OF
SOME SHOWERS AND POSSIBLY A THUNDERSTORM MAINLY OVER FAR
EASTERN OREGON, THOUGH SOME ACTIVITY HAS DEVELOPED OVER
WASHINGTON IT HAS NOT BEEN LONG LASTING.
BREEZY CONDITIONS ARE ALSO EXPECTED THIS AFTERNOON THROUGH THE
EVENING ACROSS THE CASCADE GAPS, COLUMBIA BASIN OF OREGON,
COLUMBIA GORGE, SIMCOE HIGHLANDS AND KITTITAS VALLEY. WINDS
SHOULD GUST IN THE 25 TO 30 MPH RANGE, WITH GUSTS AS HIGH AS 35
MPH.
HOWEVER, THE REST OF THE AREA WILL REMAIN DRY. BY TUESDAY, A
SPLIT FLOW REGIME WILL DEVELOP OVER THE AREA, WHICH WILL BECOME
MORE WESTERLY BY WEDNESDAY. TEMPERATURES WILL WARM TO SEASONAL
VALUES FOR MUCH OF THE WEEK, AFTER BEING BELOW NORMAL FOR THE
LAST SEVERAL DAYS. BY THE WEEKEND, TEMPERATURES RETURN TO BELOW
NORMAL WITH THE TROUGH MOVING THROUGH. HIGHS WILL BE MAINLY IN
THE 70S AT THAT TIME WHICH IS ABOUT 10 DEGREES BELOW NORMAL. THE
EFI INDICATE THE 60TH T0 70TH PERCENTILE BELOW NORMAL AT THAT
TIME.
ON THURSDAY, SOME SHORT WAVE ENERGY AND A WEAK TROUGH WILL MOVE
THROUGH THE FLOW AND INCREASE THE WINDS, AND THE FLOW WILL
BECOME MORE NORTHWESTERLY. WIND GUSTS WILL BE IN THE 25 TO 30
MPH RANGE, WITH GUSTS AS HIGH AS 35 MPH IN THE SAME AREAS AS
TODAY EVEN GOING INTO CENTRAL OREGON AND THE FOOTHILLS OF THE
BLUE MOUNTAINS. WIND GUSTS >=25 MPH ARE >=70 PERCENT IN THESE
AREAS. WIND GUSTS >=39 MPH ARE ARS HIGH AS 60 TO 90 PERCENT
ACROSS PORTIONS OF THE COLUMBIA BASIN AND KITTITAS VALLEY AND
LOWER ELSEWHERE.
THE FLOW RETURNS TO WESTERLY AGAIN ON FRIDAY, THEN SOUTHWEST IN
ADVANCE OF AN UPPER LOW THAT WILL MOVE ACROSS THE REGION
SATURDAY INTO SUNDAY, BRINGING PRECIPITATION CHANCES BACK TO
THE MOUNTAINS. THERE IS STILL SOME UNCERTAINTY AS TO THE
EVOLUTION OF THE LOW NEXT WEEKEND, BUT THE SYSTEM DOES APPEAR
TO BE PROGRESSIVE, BUT THERE WILL BE AT LEAST SOME PRECIPITATION
IN THE MOUNTAINS, AN POTENTIALLY IN THE LOWER ELEVATIONS, BUT
THE LOWER ELEVATION RAIN CHANCES APPEAR LOW AT THIS TIME.
AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/
VFR CONDITIONS PREVAIL WITH NO EXPECTED CIG OR VIS ISSUES. RAIN
HAS MOVED OUT OF THE REGION AND EXPECT DRY CONDITIONS THROUGH
THE TAF PERIOD. WINDS HAVE DECREASED SINCE THIS AFTERNOON AND
ARE GENERALLY LIGHT IN NATURE AT LESS THAN 12 KNOTS SUSTAINED.
PRELIMINARY POINT TEMPS/POPS
PDT 44 76 46 82 / 0 0 0 0
ALW 51 77 52 83 / 0 0 0 0
PSC 48 80 49 85 / 0 0 0 0
YKM 51 79 52 84 / 0 0 0 0
HRI 47 80 47 85 / 0 0 0 0
ELN 46 77 48 81 / 0 0 0 0
RDM 38 75 40 85 / 0 0 0 0
LGD 43 74 44 83 / 10 0 0 0
GCD 43 76 44 86 / 0 0 0 0
DLS 52 81 55 86 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...NONE.
OR...NONE.
DISCUSSION...77
AVIATION...95
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