577
FXUS66 KPDT 170553 AAA
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
952 PM PST SAT NOV 16 2024
UPDATE
LATEST RADAR IMAGERY SHOWS PRECIPITATION SPREADING
ACROSS THE FORECAST AREA EARLY THIS EVENING. IT IS CURRENTLY
SNOWING ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES PER
TRAFFIC CAMERAS. IT WILL SNOW OVER THE HIGHER MOUNTAINS OF THE WA
CASCADES THROUGH AROUND 06Z BEFORE A TRANSITION TO RAIN OCCURS AND
UNTIL AROUND 12Z OVER THE HIGHER ELEVATIONS OF THE NORTHERN BLUES.
THE CURRENT WINTER HIGHLIGHTS REMAIN IN EFFECT. THE BEST CHANCE TO
REACH WARNING LEVEL SNOW WILL BE AFTER THE RAIN CHANGES TO SNOW
BEHIND A COLD FRONTAL PASSAGE SUNDAY AFTERNOON. EVEN THEN IT MAY BE
TOUGH TO REACH CRITERIA IN THE NORTHERN BLUES, ALTHOUGH THERE WILL
STILL BE SEVERAL INCHES OF SNOWFALL. WINDS IN THE GRANDE RONDE
VALLEY WILL BE BUMPING UP NEAR ADVISORY LEVELS LATE TONIGHT AND
DURING THE DAY SUNDAY. THE PRESSURE GRADIENT BETWEEN BKE AND MEH
INCREASES TO 6-7 MB BUT THERE IS LITTLE UPPER WIND SUPPORT. THE
LATEST HREF HAS ROUGHLY 30-50% CHANCES FOR WINDS EXCEEDING 45 MPH IN
LADD CANYON BUT 10% OR LESS FOR WINDS OVER 50 MPH. WITH THAT IN MIND
NUDGED UP THE WINDS IN THE GRIDDED FORECAST BUT WILL HOLD OFF ON
ISSUING A WIND ADVISORY FOR NOW. 78
AVIATION...00Z TAFS
VFR WILL BE THE MOST PREVALENT FLIGHT
CATEGORY THROUGH THE FORECAST PERIOD. MVFR/IFR CONDITIONS ARE LIKELY
(60-70% CHANCE) LATER TONIGHT AND INTO SUNDAY MORNING AT KDLS BEFORE
IMPROVING SUNDAY AFTERNOON. WIDESPREAD RAIN COULD PRODUCE BRIEF MFVR
CIGS AND VSBYS AT THE OTHER TAFS SITES BUT MOSTLY VFR CONDITIONS ARE
ANTICIPATED. WINDS WILL BE GUSTY FROM THE SOUTH AT 15 TO 25 KT WITH
A FEW GUSTS TO 30 KT POSSIBLE ESPECIALLY DURING THE DAY SUNDAY. A
WIND SHIFT TO MORE WESTERLY WILL OCCUR AFTER 18-22Z WITH A COLD
FROPA. 78
PRELIMINARY POINT TEMPS/POPS
PDT 37 53 31 44 / 90 80 50 40
ALW 39 52 34 46 / 100 90 60 60
PSC 42 56 38 50 / 70 60 20 10
YKM 30 52 25 47 / 80 40 10 10
HRI 40 56 35 49 / 70 60 20 10
ELN 31 49 26 44 / 90 60 30 20
RDM 36 52 26 40 / 60 60 50 50
LGD 33 42 26 39 / 100 100 90 80
GCD 31 49 26 39 / 100 100 90 80
DLS 40 52 35 48 / 70 90 60 70
PDT WATCHES/WARNINGS/ADVISORIES
OR...WINTER STORM WARNING UNTIL 10 PM PST MONDAY FOR ORZ502.
WINTER STORM WARNING FROM 10 AM SUNDAY TO 10 PM PST MONDAY FOR
ORZ509.
WA...WINTER STORM WARNING UNTIL 10 PM PST MONDAY FOR WAZ030-522.
SHORT TERM...78
AVIATION...78
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