Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
359
FXUS66 KSEW 061600
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
900 AM PDT Mon Apr 6 2026
.SYNOPSIS...
Upper level ridge exiting the area this morning. Upper level
disturbance moving by to the north later this afternoon and
evening inducing a marine push tonight. Upper level ridge
building well offshore Tuesday with stationary upper level low
off Northern California giving Western Washington dry
northwesterly flow aloft through Friday. Upper level low moving
out of the Gulf of Alaska reaching the area over the weekend.
&&
.SHORT TERM /TODAY THROUGH WEDNESDAY/...
The latest forecast remains on track this morning with no
updates. Upper level ridge continuing to move east today with
low level offshore flow turning onshore this morning. Stratus
currently as far north as Newport will continue moving north but
not reach the Washington coast. The transition to onshore flow
will cool high temperatures along the coast into the mid and
upper 50s. Marine air associated with the onshore flow not
getting very far inland this afternoon keeping highs over the
interior in the 60s and lower 70s.
Low level onshore flow continuing to increase tonight as upper
level shortwave moves by to the north. Gale force westerly
winds down the Strait of Juan de Fuca and breezy southwest winds
over the Lower Chehalis Valley and Southern Puget Sound.
Increasing clouds overnight with lows in the mid 30s to lower
40s.
Upper level ridge building well offshore Tuesday with upper
level low remaining stationary off the Northern California coast
giving Western Washington dry northwesterly flow aloft.
Decreasing clouds with highs much cooler for the interior, mid
to upper 50s. Highs along the coast in the mid 50s.
Little change in the pattern Tuesday night and Wednesday. Under
mostly clear skies lows will be chilly Wednesday morning. The colder
locations in the South Puget Sound and Southwest Interior will
be near freezing. Lows in the mid 30s to near 40 for the
remainder of the area. Highs Wednesday mid 50s to lower 60s.
Felton
&&
.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
Models remaining in good agreement with the upper level ridge
offshore and the upper level low off Northern California
remaining in place into Friday. Dry northwesterly flow aloft
continuing over the area. Slight warming trend with highs in
the upper 50s to mid 60s. Lows in the 30s and lower 40s.
Models in much better agreement over the weekend. Cool upper
level low dropping down out of the Gulf of Alaska moving over
Western Washington with showers and cooler temperatures. Highs
lowering into the 50s Saturday and lower to mid 50s Sunday.
Cloud cover will keep lows in the upper 30s to mid 40s.
&&
.AVIATION...
High pressure overhead will shift eastward today as a system passes
to the north. Middle and high clouds will progress through the
region this afternoon. Slight chances for showers will be confined
more to the central and north Cascades this evening. Strong westerly
winds are set to begin through the Strait of Juan de Fuca this
afternoon, leading to some potentially gusty winds in areas from PAE
north. Otherwise, surface winds will be WSW at 6-10 kts today,
turning back to a northerly in the evening between 5-8 kts, around
00-03Z in Puget Sound. Clouds along the coast this morning could be
somewhat lower with some visby restrictions possible, but likely not
enough cover to constitute a true cig. Otherwise, VFR expected
through the rest of the TAF period.
KSEA...Winds will transition more to a WSW wind this afternoon ahead
of the passing frontal system. Post frontal north/northwesterly
winds are expected after 00Z this evening. A mix of middle and high
clouds are expected throughout the period, but with the lowest not
dipping much below 10 kft. Confidence is low (less than 15%) in any
precipitation reaching the terminal today.
21/41
&&
.MARINE...
Broad high pressure remains in place across the area today with a
weak thermal trough build up along the west coast, keeping winds
northerly. Winds will increase this afternoon as a front passes by
to the north and stronger high pressure builds in behind it. Small
Craft Advisory has been extended to the southern coastal zones as
winds are expected as well as into Admiralty Inlet. Seas are also
going to increase today, with 9-11 ft seas expected. The
northernmost outer coastal zone could see seas up to 15 feet as it
is closer to the path of the low pressure system. With the onshore
gradients getting to plus 5-6 mb, have upgraded to a gale warning in
the central and eastern Strait this afternoon. Winds of 25 to 35 kts
are possible with the occasional gust to 40 kt possible. Winds will
continue to turn down into the Puget Sound. Winds will slowly ease
on Tuesday and remain relatively light through the rest of the week
as high pressure remains in place over the northeast Pacific.
21
&&
.HYDROLOGY...
No river flooding is expected over the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 2 PM this afternoon to 2 PM PDT
Tuesday for Coastal Waters From Cape Flattery To James
Island 10 To 60 Nm-Coastal Waters From Cape Flattery To
James Island Out 10 Nm-Coastal Waters From James Island
To Point Grenville 10 To 60 Nm-Coastal Waters From James
Island To Point Grenville Out 10 Nm-Coastal Waters From
Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal
Waters From Point Grenville To Cape Shoalwater Out 10 Nm-
West Entrance U.S. Waters Strait Of Juan De Fuca.
Gale Warning until 5 AM PDT Tuesday 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 5 AM PDT
Tuesday for Admiralty Inlet.
&&
$$
NWS SEW Office Area Forecast Discussion