Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
697
FXUS66 KSEW 280926
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
226 AM PDT Sun Jun 28 2026
.SYNOPSIS...
A broad upper trough and onshore flow will continue to produce
cloud cover and below normal temperatures across Western
Washington throughout much of the week ahead. Weak weather
systems passing through the trough will bring periodic chances
of showers...especially over the mountains.
&&
.SHORT TERM /TODAY THROUGH TUESDAY/...
The upper level low pressure system that brought showers to the
area on Saturday continues to shift southeastward toward the
Great Basin this morning. However, a broad upper trough will
remain over the Pacific Northwest over the next several days. A
series of nondescript disturbances will dip southward from
British Columbia through midweek that will act to enhance
onshore flow from time to time and produce just enough lift to
squeeze out a few showers over mainly higher terrain.
Temperatures will remain a little below average through the
period.
&&
.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
We`re stuck in pretty much the same pattern as midweek arrives
with a mean upper trough position parked over the Pacific
Northwest. So, in sensible terms, it will likely be more of the
same with mostly dry conditions outside of a few mountain
showers and temperatures a smidge below average. As we approach
the upcoming holiday weekend, the forecast picture begins to
turn a little more uncertain. Ensembles are beginning to a show
a trend toward a less amplified synoptic pattern along the west
coast by Friday into the 4th. This would favor a return to
temperatures closer to normal and generally dry conditions.
27
&&
.AVIATION...An upper-level low will rotate through the Pacific
Northwest through the period with western Washington under northerly
flow aloft. High pressure offshore will maintain an onshore flow
regime with marine stratus along the coast and diurnal variation
across the interior. A shortwave embedded in the northerly flow
aloft slide through western Washington and Oregon Sunday evening he
west side of the Cascades, potentially resulting in light drizzle at
the coastal terminals. It is expected to remain dry elsewhere.
Expect IFR/MVFR ceilings across the interior terminals to improve to
VFR after 19-21Z. Winds will be from the west 7-12 knots along the
coast and from the west-southwest 6-11 knots across the interior.
KSEA...Low MVFR/IFR ceilings expected to continue through at least
19Z Sunday, improving to VFR thereafter. Winds will remain from the
south-southwest through the period with speeds 6-9 knots. Breezes up
to 15 knots in the afternoon.
&&
.MARINE...
The dominant weather feature will involve broad high pressure
over the Pacific and lower pressure over the interior that will
promote onshore flow through the week. This will lead to gusty
northwesterlies over the coastal waters and steep, choppy seas.
In addition, the central and east portions of the Strait of
Juan de Fuca will likely see diurnally driven increases in
westerlies that may reach small craft advisory strength at
times. The offshore ridge looks to weaken late this week for
lighter winds and subsiding seas.
&&
.FIRE WEATHER...
Little in the way of fire weather concerns remain in the picture
well into the week ahead with upper troughing maintaining cool
conditions, high RH, and periodic chances for shower activity.
A trend toward more seasonable temperatures is indicated toward
late week, but a significant warm and dry spell is not expected
in the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 5 AM PDT early this morning for
Central U.S. Waters Strait Of Juan De Fuca-East Entrance
U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory from 5 PM this afternoon to 1 AM PDT
Monday for Central U.S. Waters Strait Of Juan De Fuca-
East Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until 11 AM PDT Monday for Coastal Waters
From Cape Flattery To James Island 10 To 60 Nm-Coastal
Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10
To 60 Nm.
&&
$$
NWS SEW Office Area Forecast Discussion