578
FXUS66 KSEW 040316
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
816 PM PDT Thu Jul 3 2025

.UPDATE...Mostly clear skies across Western Washington this
evening, with the latest satellite imagery showing clouds moving
from Oregon towards the region. Otherwise, no significant updates
to the forecast this evening. Please refer to an updated aviation
and marine section.

&&

.SYNOPSIS...Seasonably warm weather for the 4th of July holiday
is expected with a weak trough pushing through the area late this
week. A warming trend is expected by early next week as a ridge of
high pressure build across the western states.

&&

.SHORT TERM /TONIGHT THROUGH SUNDAY/...A trough moving through
southern Canada will slide east overnight but additional troughing
will approach the region from the west as well. This will provide
continued tranquil weather overnight and low temperatures on the
cool side, from the mid 40s to 50s. As the trough pushes east
Friday, it looks to generate thunderstorm activity but this is
expected to remain east of the forecast area. This will provide
more cloudiness in the afternoon and evening, but temperatures
will warm above todays readings and be near normal in the middle
to upper 70s for highs. The trough exits Friday overnight,
allowing a somewhat zonal flow over the area with a series of weak
systems nearby. This will allow for near normal conditions with
lows in the 40s/50s and highs in the 70s and no significant
weather or impacts expected. A slight warming trend will shape up
later on Sunday as heights begin to rise and a few more lower 80s
for highs are expected especially south.

.LONG TERM /MONDAY THROUGH THURSDAY/...The first portion of the
coming week should feature a warming trend. Heights will climb
alongside a strengthening mid level ridge of high pressure over
the four corners region. This will bring highs back above normal
on Monday and Tuesday, with lower and mid 80s more common across
the region. With warming overnight lows closer to 60 degrees by
Tuesday morning, the overall heat impact levels will begin to inch
up somewhat. This will bear monitoring in the extended time
period by Tuesday. Some increasing uncertainty by mid week. The
corners ridge becomes quite strong, however a series of troughs
over the north Pacific may do their best to hold mid level ridging
at bay to our south. The current forecast indicates highs
remaining in the low to mid 80s for the mid-latter part of next
week.

One constant through the next several days is that it looks to
remain dry across the forecast area. Storms are expected to be too
far east and then with ridging building in there are no rain
chances to speak of.

&&

.AVIATION...VFR this evening with convective debris clouds  moving
north from Oregon. No thunderstorm activity is expected in western
Washington. Clouds will continue to scatter into tonight with
generally N/NW surface winds. MVFR stratus deck will reform along
the coast into the early morning Friday and expand inland, likely
staying to the west of the Puget Sound.

KSEA...VFR with northerly surface winds between 8 and 10 kts. VFR is
favored to continue through the TAF period, with low potential (15%
to 20%) of MVFR ceilings in low stratus drifting east early Friday
morning. NW to NE winds 10 kt or less will continue through much of
the period before shifting SW later Friday afternoon.

15/21

&&

.MARINE...High pressure will remain in place across the coastal and
offshore waters today, allowing for evening westerly pushes through the
Strait of Juan de Fuca. The Central and Eastern Strait will see west
winds just below SCA criteria this evening. A front will cross area
waters on Friday, generating another round of strong winds through the
Strait. A Gale Watch has been issued for Friday evening through
Saturday morning, but some uncertainty exists over how strong the winds
will be. A weak front will dissipate over the offshore waters Saturday,
with a series of weak fronts crossing area waters next week.

Seas will remain between 4 to 7 feet through the period.

15/21

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Gale Watch from Friday afternoon through late Friday night for
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.

&&

$$