578
FXUS66 KPDT 271015
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
315 AM PDT THU AUG 27 2026
KEY MESSAGES
- AN UPPER LEVEL TROUGH WILL BRING CONTINUED BREEZY WINDS AND
COOLER TEMPERATURES TODAY.
- A SECOND TROUGH FRIDAY NIGHT OR SATURDAY WILL BRING MORE
BREEZY CONDITIONS AND COOLER, BELOW NORMAL TEMPERATURES.
DISCUSSION
AN UPPER LEVEL LOW WILL MOVE INTO BRITISH COLUMBIA LATER TODAY.
THE TROUGH ASSOCIATED WITH THE LOW WILL MOVE BY TO THE NORTH,
BUT A FRONTAL BOUNDARY WILL MOVE ACROSS THE REGION.
TEMPERATURES WILL BE ABOUT 10 DEGREES COOLER TODAY THAN ON
WEDNESDAY.
WINDS WILL REMAIN GUSTY TODAY, SIMILAR TO WEDNESDAY, POSSIBLY
EVEN A BIT HIGHER. WINDS SHOULD GUST IN THE 25 TO 35 MPH RANGE
ACROSS THE KITTITAS VALLEY, SIMCOE HIGHLANDS, COLUMBIA GORGE,
COLUMBIA BASIN AND FOOTHILLS OF THE BLUE MOUNTAINS. NBM
PROBABILITIES OF WIND GUSTS >=25 MPH IN THESE AREAS IS GENERALLY
GREATER THAN 80 PERCENT. HOWEVER, WIND GUST PROBABILITIES >=39
MPH IS LESS THAN 30 PERCENT EXCEPT FOR A FEW LOCAL POTS WHERE IT
IS GREATER THAN 50 PERCENT.
THE COOLER TEMPERATURES WILL ALSO CAUSE A DECREASE IN RELATIVE
HUMIDITIES BY ABOUT 5 TO 10 PERCENT ON AVERAGE. AS A RESULT
FIRE WEATHER CONDITIONS WILL REMAIN ELEVATED, BUT NOT CRITICAL
TODAY.
ANOTHER TROUGH/UPPER LOW MOVES DOWN FROM THE NORTHWEST LATER
FRIDAY INTO SATURDAY. MUCH LIKE THE SYSTEM TODAY, THIS LOW AND
TROUGH WILL BRING GUSTY WINDS TO THE KITTITAS VALLEY, SIMCOE
HIGHLANDS, COLUMBIA BASIN AND GORGE AND FOOTHILLS OF THE BLUE
MOUNTAINS. IT WILL ALSO BRING COOLER TEMPERATURES. NBM
PROBABILITIES OF WIND GUSTS >=25 MPH ARE GREATER THAN 90
PERCENT IN THESE AREAS WHILE NBM PROBABILITIES OF WIND GUSTS
>=39 MPH ARE GENERALLY <30 PERCENT EXCEPT FOR THE KITTITAS
VALLEY AND SOME LOCAL AREAS IN THE COLUMBIA BASIN.
WITH THE PASSAGE OF THIS TROUGH AND ASSOCIATED COLD FRONT, HIGH
TEMPERATURES WILL BE IN THE 70S IN MOST AREAS, WHICH WILL BE
ABOUT 10 TO 15 DEGREES BELOW NORMAL. OVERNIGHT LOWS WILL DROP
INTO THE 40S ACROSS A WIDE SWATH OF THE AREA BY SUNDAY MORNING.
FLOW WILL BECOME MORE SOUTHWESTERLY EARLY NEXT WEEK BEFORE
ANOTHER SYSTEM BRINGS MORE GUSTY WINDS AND POSSIBLY SOME
MOUNTAINS SHOWERS AROUND TUESDAY.
FOR ANYONE INTERESTED IN ECLIPSES, TONIGHT THERE WILL BE A
PARTIAL LUNAR ECLIPSE. IT WILL BE ABOUT 93% COVERAGE. WITH
SUNSET BEING AROUND 740 PM OR SO, DEPENDING ON YOUR LOCATION,
THE MOON WILL ALREADY BE IN ECLIPSE WHEN THE SUN GOES DOWN. PEAK
ECLIPSE WILL BE AROUND 912 PM PDT AND THE ECLIPSE WILL END
AROUND 1051 PM PDT. THE SKY LOOKS TO BE RELATIVELY CLEAR, THE
ONLY CONCERN WILL BE IF THERE IS ANY SMOKE OR HAZE FROM NEARBY
WILDFIRES IN YOUR VICINITY. HOPEFULLY, TODAY'S GUSTY WINDS KEEP
THE SMOKE AWAY.
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD.
WINDS SHOULD GUST THIS MAINLY THIS AFTERNOON AND EVENING IN THE
20 TO 25 KT RANGE (AND MOST OF THE DAY AT DLS). WINDS SHOULD
DECREASE TO 10 KTS OR LESS DURING THE EVENING HOURS. THE GUSTY
WINDS SHOULD HELP ALLEVIATE SMOKE AT THE TAF SITES, THOUGH LOCAL
SMOKE EFFECTS CAN NOT BE RULED OUT, ESPECIALLY DURING THE
MORNING HOURS.
PRELIMINARY POINT TEMPS/POPS
PDT 82 46 80 50 / 0 0 0 0
ALW 85 53 82 55 / 0 0 0 0
PSC 88 50 85 50 / 0 0 0 0
YKM 86 54 84 52 / 0 0 0 0
HRI 85 52 84 51 / 0 0 0 0
ELN 77 48 76 47 / 0 0 0 0
RDM 82 40 81 38 / 0 0 0 0
LGD 88 48 85 49 / 0 0 0 10
GCD 91 51 87 50 / 0 0 0 10
DLS 80 56 81 55 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...AIR QUALITY ALERT UNTIL NOON PDT FRIDAY FOR WAZ026-522-523.
OR...AIR QUALITY ALERT UNTIL NOON PDT FRIDAY FOR ORZ041-505-506-
509>511.
DISCUSSION...77
AVIATION...77
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