Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
044
FXUS66 KSEW 300318
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
818 PM PDT Mon Jun 29 2026
.SYNOPSIS...
A broad upper level trough will continue to produce unsettled
and cool conditions across Western Washington into midweek along
with chances for mainly mountain showers. Drier conditions and
a modest warming trend are expected for the upcoming holiday
weekend as a weak ridge begins to build offshore.
&&
.SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/...
The overall weather pattern looks to remain consistent through
the short term period with broad upper level troughing over much
of the western U.S. Cool and cloudy conditions will prevail with
high temperatures remaining below normal, in the mid to upper
60s. Low temperatures will remain around normal, in the upper
40s to mid 50s. Clouds will attempt to give way to some sun
breaks, but mostly cloudy conditions will prevail through the
vast majority of the day. Slight chances for isolated showers
or drizzle from the marine stratus will persist over the
mountains, but meaningful precipitation accumulation is not
forecast.
&&
.LONG TERM /THURSDAY THROUGH MONDAY/...
A shortwave impulse looks to move over the area on Thursday,
bringing a weak frontal system that will traverse the area.
Models are keeping this system mostly dry, with the exception of
some light precip over the northwest portions of the Olympic
Peninsula. Otherwise, cloud conditions will continue for
Thursday. Friday and into the holiday weekend, the model spread
gets larger, but are hinting at weak ridging developing
offshore. This should help to bring more sun back into the
forecast, as well as warming temps closer to normal, up into the
mid to upper 70s.
&&
.AVIATION...
Broad upper troughing over the interior West will maintain
northwesterly flow aloft over Western Washington. MVFR cigs under
stratus this evening for the majority of terminals. Some terminals
have managed to rebound to low-end VFR; however, it will be brief
and clouds will fill in and lower once again overnight. Localized
IFR conditions will be possible early tomorrow morning. The pattern
will repeat itself again with cigs gently raising and breaking up
late morning into the afternoon. Southwest winds 5-10 kt will
continue overnight into tomorrow.
KSEA...VFR cigs at the terminal at the moment. However, expecting
VFR cigs to be brief and ceilings lowering once again to MVFR.
Periods of IFR cannot be ruled out, particularly between 14-17Z Tue.
The pattern repeats tomorrow with a slow lift of cigs with some
breaks in the afternoon. Southwest winds 5-10 kt will continue
overnight into tomorrow.
62/29
&&
.MARINE...
Broad high pressure centered well offshore and lower pressure
across the interior will remain the dominant weather pattern
through Wednesday. This will maintain onshore flow with gusty
northwesterlies and steep seas up to for the coastal waters,
especially through the outermost waters where seas may reach up
to 11-13 ft. Diurnally driven westerly pushes will occur in the
Strait of Juan de Fuca as well for Small Craft Advisory winds
each afternoon and evening through the next seven days.
High pressure looks to weaken during the later half of the week
as a broad surface low approaches the central British Columbia
coast and may bring a weak frontal system through the coastal
waters on Thursday. This will weaken onshore flow allowing
winds over the coastal waters to ease and seas subside.
27/62
&&
.FIRE WEATHER...
Little in the way of fire weather concerns remain in the
picture into the week ahead as upper level troughing maintaining
cool conditions, high RH, and periodic chances for shower
activity. A trend toward more drier and 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 2 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 until 5 AM PDT Wednesday 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.
&&
$$
NWS SEW Office Area Forecast Discussion