679
FXUS66 KPDT 081743
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1042 AM PDT FRI MAY 8 2026
KEY MESSAGES
1. BREEZY TO WINDY THROUGH THE GAPS TODAY
2. DRY AND WARM CONDITIONS WILL PERSIST THROUGH THE WEEK
3. PATTERN SHIFT TUESDAY WILL BRING CHANCES OF MOUNTAIN SHOWERS
DISCUSSION
CURRENTLY SATELLITE SHOWS SOME MID LEVEL CLOUDS FORMING OVER CENTRAL
OR WITH HIGH CLOUDS ACROSS THE REMAINDER OF THE REGION. ANOTHER DRY
AND COOL NIGHT ON THE DOCKET. LOW TEMPERATURES THIS MORNING WILL BE
IN THE MID TO UPPER 40S ACROSS MUCH OF THE REGION WITH THE BASIN
SEEING LOW 50S (70-90% CONFIDENCE).
MODELS SHOW A SHORTWAVE RIPPLING AROUND THE RIDGE BRINGING WITH IT
INCREASED WINDS THROUGH THE MOUNTAIN GAPS. WINDS WILL BE STRONGEST
THROUGH THE KITTITAS VALLEY WITH WINDS BETWEEN 25-35 MPH WITH GUSTS
TO 55 MPH EXPECTED (70-80% CONFIDENCE). THERE IS A WIND ADVISORY IN
EFFECT FROM 11 AM FRIDAY TO 11 AM FRIDAY FOR THESE WINDS. WINDS
THROUGH THE GORGE WILL BE ELEVATED TO NEAR 15-20 MPH WITH GUSTS TO
30 MPH WITH 70-90% OF THE HREF RAW ENSEMBLES IN AGREEMENT. WINDS
WILL ALSO BE ELEVATED ALONG THE FOOTHILLS OF THE BLUES WITH WINDS OF
15-20 MPH AND GUSTS TO NEAR 30 MPH WITH 70-90% OF THE HREF RAW
ENSEMBLES IN AGREEMENT. MODELS SHOW ONCE THE SHORTWAVE DISSIPATES,
WINDS WILL RETURN TO 'NORMAL' ACROSS THE REGION WITH WINDS SETTLING
BACK TO DIURNALLY DRIVEN.
MODELS SHOW THE UPPER LEVEL RIDGE TO BE IN PLACE OVER THE REGION
WITH NO SIGNS OF MOVEMENT THROUGH THE REMAINDER OF THE WEEK AND OVER
THE WEEKEND. DRY AND WARM CONDITIONS WILL REMAIN THROUGH THE PERIOD
WITH IN HOUSE CALCULATIONS SHOWING TEMPERATURES TO BE ANYWHERE FROM
5 TO 10 DEGREES ABOVE NORMAL TODAY STEADILY INCREASING TO 15-25
DEGREES ABOVE SEASONAL NORMAL BY TUESDAY. THE SHORTWAVE THE MODELS
SHOW COMING ACROSS THE REGION WILL BRING SLIGHTLY COOLER
TEMPERATURES TODAY WITH TEMPERATURES IN THE LOW TO MID 70S ACROSS
MUCH OF THE REGION WITH 80-90% OF THE HREF RAW ENSEMBLES IN
AGREEMENT. THE BASIN WILL SEE TEMPERATURES IN THE LOW 80S. AS WE
MOVE THROUGH THE WEEKEND, THE RIDGE WITH REBOUND AND TEMPERATURES
WILL STEADILY INCREASE WITH SUNDAY BEING THE WARMEST DAY OVER THE
WEEKEND WITH TEMPERATURES IN THE LOW TO MID 80S ACROSS MUCH OF THE
REGION WITH HIGH 70S ELSEWHERE (70-80% CONFIDENCE).
MODELS SHOW THE RIDGE REMAINING OVERHEAD THROUGH TUESDAY WHEN THEY
SHOW AN UPPER LEVEL SYSTEM MAKING ITS WAY TOWARDS THE PACNW. CLUSTERS
SHOW THERE TO BE A VARIANCE BETWEEN THE TIMING AN POSITION OF THE
SYSTEM. ECMWF AND THE CANADIAN ARE IN CLOSER AGREEMENT WITH AN UPPER
LEVEL LOW MOVING IN WITH SOUTHWEST FLOW ALOFT. GFS IS SLOW TO BRING
THE LOW IN AS WELL AS BRINGING THE LOW IN LOWER TOWARDS THE COAST OF
CALIFORNIA. REGARDLESS, ALL MODELS SHOW THE BREAKDOWN OF THE RIDGE
LEADING TO INCREASED CHANCES OF MOUNTAIN PRECIPITATION AND COOLER
TEMPERATURES. CONFIDENCE IN THE FORECAST THUS FAR IS LOW/MODERATE
(30-50%). 90
AVIATION /18Z TAFS THROUGH 18Z SATURDAY/
THERE IS A SURFACE COLD FRONT APPROACHING THE REGION THAT WILL
INFLUENCE WEATHER FROM WEST TO EAST THROUGH SATURDAY AFTERNOON. HIGH
AND OCCASIONAL MIDDLE LAYER CLOUDS (ABOVE 10K FT) WILL BE SCOURED
OUT COMPLETELY BY SATURDAY, MAINTAINING VFR CONDITIONS AT ALL
TERMINALS. INCREASING HIGH PRESSURE WILL PROMOTE GUSTY AFTERNOON
WINDS FOR MOST OF THE TERMINALS (IN THE 20 TO 30 KNOTS RANGE) FOR
THIS AFTERNOON, BUT RETURN TO LIGHT WINDS FOR SATURDAY. RUSSELL/71
FIRE WEATHER
WITH THE DRY AND WARM CONDITIONS, DAYTIME RHS WILL SEE LOWS IN
THE TEENS, ESPECIALLY THROUGH CENTRAL OR THROUGH THE WEEK
BECOMING A BIT MORE WIDESPREAD BY TUESDAY. MODERATE OVERNIGHT
RECOVERIES TONIGHT WITH INCREASING RECOVERIES THROUGH THE
WEEKEND.
HYDROLOGY
NACHES AT NACHES REMAINS ABOVE ACTION LEVEL AND IS EXPECTED TO
REMAIN AS SUCH THROUGH THE WEEK. (90% CONFIDENCE)
PRELIMINARY POINT TEMPS/POPS
PDT 46 77 50 79 / 0 0 0 0
ALW 50 77 53 80 / 0 0 0 0
PSC 49 81 53 85 / 0 0 0 0
YKM 46 81 52 83 / 0 0 0 0
HRI 48 80 51 82 / 0 0 0 0
ELN 43 77 49 74 / 0 0 0 0
RDM 38 84 46 81 / 0 0 0 0
LGD 41 77 45 82 / 0 0 0 0
GCD 40 80 44 86 / 0 0 0 0
DLS 48 83 55 77 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
WA...WIND ADVISORY FROM 11 AM THIS MORNING TO 11 PM PDT THIS
EVENING FOR WAZ026.
OR...NONE.
DISCUSSION...90
AVIATION...71
FIRE WEATHER...82
HYDROLOGY...86
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