716
FXUS66 KSEW 050257
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
757 PM PDT Fri Jul 4 2025

.UPDATE...Partly to mostly cloudy skies this evening across
portions of Western Washington for the 4th of July. Otherwise, no
significant updates to the forecast this evening. Please refer to
an updated aviation section below.

&&

.SYNOPSIS...Seasonal temperatures early in the holiday weekend
will be replaced by a warming trend early next week as an upper
ridge strengthens over Western Washington. The ridge will weaken
and onshore flow will increase for a cooling trend in the second
half of next week.

&&

.SHORT TERM /TONIGHT THROUGH MONDAY/...An upper trough over the
region will shift eastward tonight. Increasing onshore flow behind
it will lead to additional cloud cover overnight into Saturday
morning. Temperatures on Saturday will remain near or slightly
below normal. A warming trend commences Sunday into Monday as an
upper level ridge rebuilds. High temperatures will get back into
the lower to mid 80s from the Seattle area southward by Monday.

.LONG TERM /TUESDAY THROUGH FRIDAY/...The upper ridge remains
firmly in control on Tuesday with light onshore flow. Interior
temperatures from central Puget Sound southward peak in the mid to
upper 80s with mostly lower to mid 70s coast and North Interior.
An overall trend toward a flattening ridge, increasing onshore
flow, and a cooling trend is still expected for the second half of
next week. There is, however, enough of a spread in the ensembles
to lend a considerable degree of uncertainty to the extent of the
cooling. The ongoing theme of typically dry conditions for July
continues.

&&

.AVIATION...Expect upper level flow to become increasingly
westerly overnight through Saturday with the region sitting in
between a disturbance crossing central British Columbia to the north
and another off the northern California coast. Onshore low-level
flow will strengthen this evening and continue Saturday. Expect
variable high clouds this evening and tonight across Western
Washington. Weak convergence across central Puget Sound could bring
some ceilings around 5000 ft or so, with increasing west winds
across KCLM and through Whidbey Island, northerly winds through the
northern Puget Sound region and south/southwest winds in the South
Sound. Some MVFR stratus remains along the north coast or just
offshore this afternoon, but returns more solidly into all coastal
areas 06-09z tonight. This stratus spreads inland into Puget Sound
toward 12z. Additionally, some haze across the metro corridors is
possible late evening/early tonight as stability increases and
holiday related celebrations occur.

KSEA...Variable high clouds with the potential for some mid-level
clouds around 5000 ft expected thanks to weak convergence.
Southwesterly surface winds for the TAF period mainly running 4-8
kts. MVFR stratus redeveloping around 12z before scattering mid-late
morning Saturday.

Cullen/18

&&

.MARINE...High pressure remains in place across the coastal waters
with high pressure strengthening early next week. Meanwhile,
diurnally west pushes through the Strait of Juan de Fuca will
continue each evening during the evening hours. Tonight`s push is
the strongest of the next few days and have maintained the gale
warning for the central and eastern Strait, though the confidence in
duration and coverage of strongest winds has decreased a bit.
Regardless, expect a weaker push tomorrow evening but still may need
an advisory for that round. Seas will increase over the coastal
waters early next week as persistent northerly wind build steeper
conditions. A weak front will approach the northern coastal waters
Tuesday. Cullen

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Gale Warning until 5 AM PDT Saturday for Central U.S. Waters
     Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of
     Juan De Fuca.

     Small Craft Advisory until 2 AM PDT Saturday for Admiralty Inlet.

&&

$$