244
FXUS66 KSEW 282222
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
322 PM PDT Tue Jul 28 2026

.SYNOPSIS...A weak front will cross the region today followed by
dry and mild weather Wednesday and Thursday. High pressure will
lead to warmer conditions on Friday. An upper level low will
shift inland Friday night and Saturday for cloudy and cooler
weather with a chance of showers. High pressure returns early
next week.


&&

.SHORT TERM /TODAY THROUGH THURSDAY NIGHT/...A weak front is
pushing inland this afternoon with isolated to scattered light
showers in the interior and Cascades. There`s a 15-20 percent
chance of thunderstorms in Whatcom County but so far not seeing
too much activity on radar. Temperatures are noticeably cooler
and in the 60s and 70s - a few degrees cooler than average.

Broad low pressure will spin off B.C. Wednesday and Thursday
with generally dry and mild conditions over western WA. Near the
surface, onshore flow prevails, for a mix of morning clouds and
afternoon sunbreaks. Temperatures will track in the 60s and 70s
again, a degree or two shy of average. 33

&&

.LONG TERM /FRIDAY THROUGH MONDAY/...Low pressure continues to
spin offshore on Friday while high pressure builds inland. The
air mass over western WA will be a little warmer and drier with
daytime temps in the low to mid 80s across the interior. The
coast will be in the 60s to lower 70s. The low starts to slowly
shift inland Friday night and Saturday with a chance of
showers. We may also see showers with a convergence zone over
the north sound Saturday afternoon with a chance of
thunderstorms in the North Cascades. The upper departs N/NE on
Sunday with a return to dry and stable weather. A weak upper
level ridge will lead to warmer conditions early next week with
interior lowlands seeing the 80s again. 33

&&

.AVIATION...Southwesterly flow aloft, with low level onshore flow
maintaining the marine layer over much of western Washington.
Pockets of MVFR ceilings lingering along the coast, strait and
central Puget Sound. VFR conditions this afternoon will lower again
to 2500 to 3000 ft, with some areas below 2000 ft Wednesday
morning.


KSEA...VFR ceilings above 5000 feet through the at or just below
3000 feet Wednesday morning. Both LAMP and REFS guidance showing a
25-35% chance of of a brief period of ceilings less than 3000 feet
around 15z. Southerly winds 10 to 15 knots easing after 03z, and
then are expected to shift to northerly. 75% of REFS members have
this shift by 04Z.

&&

.MARINE...High pressure will return to area waters Wednesday
through Friday. Another weak system will reach the waters over
the weekend. Periods of small craft advisory winds remain
possible with onshore flow via the Strait of Juan de Fuca
particularly Thursday evening and again Friday evening into
Saturday morning. Seas over the coastal waters are expected to
remain in the 4 to 5 foot range into the weekend.


&&

.FIRE WEATHER...Drier and warmer conditions return Wednesday
through Friday, with minimum humidity values dipping into the
30s on Friday. However, low-level flow remains onshore to
provide for good to excellent overnight recoveries, and this
looks to be a short-lived trend as the pattern shifts back to
cooler and cloudier conditions for the weekend.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.

&&

$$