Dayton, Washington Weather Forecast Discussion

103
FXUS66 KPDT 202357
AFDPDT
Area Forecast Discussion
National Weather Service Pendleton OR
457 PM PDT Sat Sep 20 2025
.UPDATED AVIATION.
.AVIATION...00Z TAFs...VFR conditions forecasted through the
period for all sites. Mostly clear conditions starting the period,
with low/mid level clouds pulling through the area in the second
half of the period, due to the passage of a cold front.
The next weather system will bring in some gusty winds and chances
of showers and thunderstorms over the next 24-hours. Higher
confidence was noted in the Basin sites starting at around 21Z.
Didn`t feel confident enough to only put a PROB30 in the DLS/YKM
for tomorrow morning. Winds will be gustier as the front
approaches the area tomorrow morning/early afternoon. Expecting
most sites to reach 20-25 knots of gust by tomorrow morning.
Winds could be gustier near stronger storms.
Although the forecast calls for VFR conditions, there`s low
chances (10-30%) for sub-VFR CIG/VIS conditions. Stronger storms
could dip CIG and VIS levels temporarily, but overall will be a
dominantly VFR forecast.
&&
.PREV DISCUSSION... /issued 156 PM PDT Sat Sep 20 2025/
DISCUSSION...Satellite imagery reveals multiple features of
interest in the Pacific. A closed low centered off the coast of
central California is advecting remnants of tropical moisture
northward into the Blue Mountains region, leading to PWATs of
150-200% of normal. To the northwest, a closed low is churning in
the Gulf of Alaska, and water vapor imagery shows a shortwave
diving southeast towards the Pacific Northwest. Ahead of the
shortwave, a frontal boundary is draped from Vancouver Island
southwest into the Pacific.
Today, there is a slight chance (10-15%) of isolated showers and
thunderstorms across the Blue Mountains, roughly from the Bend
metro area eastward. Cross-Cascade pressure gradients will drive
breezy winds through the Cascade gaps into wind-prone areas of the
Columbia Basin today. While some areas will approach Red Flag
thresholds for wind and low relative humidity, confidence was too
low (

NWS PDT Office Area Forecast Discussion