231
FXUS66 KSEW 281559
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
859 AM PDT Mon Apr 28 2025

.UPDATE...No changes to the overall forecast. Please see the
aviation and marine sections below for updates to those
forecasts.

.PREV DISCUSSION...

&&

.SYNOPSIS...Cooler and damp conditions expected for the start
of the week before warmer temperatures return by Wednesday and
Thursday. Precipitation chances return to the forecast by Friday
into next weekend.

&&

.SHORT TERM /TODAY THROUGH WEDNESDAY/...Widespread stratus is
apparent on satellite early this morning thanks to continued
onshore flow. A weak frontal system is still expected to drop
into western Washington from the north later this evening,
bringing light rain and through Tuesday morning. Light rain
accumulations are expected, as well as high snow levels above
5,000 to 6,000 feet. Today is likely going to be the coolest day
of the week, with highs in the upper 50s. Beyond Tuesday
morning, expect some lingering showers in the Cascades, but
generally drying conditions elsewhere.

An upper level ridge returns to the PNW by Wednesday, beginning a
warming trend. Temperatures will climb into the mid to upper 60s,
setting the stage for a warmer day still on Thursday.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...Absolutely
pleasant temperatures are expected on Thursday as highs climb
into the upper 70s for much of Puget Sound and surrounding
Cascade Valleys. Even coastal locations will reach the upper
60s. Low 80s are expected in the southwest interior. Enjoy it,
as temperatures will moderate somewhat into the upper 60s and
low 70s on Friday as increased onshore flow resumes with the
ridge moving east. This will allow the next frontal system to
move into western Washington on Friday into Saturday. Exact
track of the low will have implications on how much
precipitation the region receives, but at this point in the
forecast cycle, the forecast calls for the bulk of the rain to
fall in the Cascades and northern Olympic coast.

21

&&

.AVIATION...Upper level ridge moving east this morning. Frontal
system approaching from the northwest moving through Tuesday.
Northwesterly flow aloft becoming westerly this morning. In the
lower levels, south to southwesterly flow will persist through the
TAF period.

Widespread MVFR ceilings this morning. Improving trend this
afternoon over the interior with ceilings becoming VFR 21z-00z.
Ceilings remaining MVFR along the coast. MVFR ceilings returning to
the interior after 08z and through much of Tuesday morning as the
front moves through.

KSEA...MVFR ceilings becoming VFR 21z-00z. MVFR ceilings
redeveloping 09z-12z. Light southerly winds 09z-16z, 4 to 8 knots
16z-21z and 03z-12z, 8 to 12 knots 21z-03z. Wind shift to N at after
21Z Tuesday as a push down the Strait of Juan de Fuca rounds the
corner and moves south towards the terminal.

Felton/62

&&

.MARINE...High pressure over the waters will weaken today. A weak
frontal system will move across the waters tonight into Tuesday.
High pressure will rebuild Wednesday and remain into Thursday.
Another front arrives Friday.

Westerly winds in the Central and Eastern Strait will ease this
morning. Small craft advisory westerlies again in the Central and
Eastern Strait Tuesday night.

Choppy seas over the outer coastal waters ending this morning.
Seas below 10 feet through the week with the seas peaking in the 7
or 8 foot range late in the week. Felton

&&

.HYDROLOGY...No river flooding is expected over the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 6 PM Tuesday to 5 AM PDT Wednesday
     for Central U.S. Waters Strait Of Juan De Fuca-East
     Entrance U.S. Waters Strait Of Juan De Fuca.

&&

$$