Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
358
FXUS66 KSEW 071028
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
328 AM PDT Tue Apr 7 2026
.SYNOPSIS...
Dry and cooler conditions today as a colder air mass settles
over the region. A dry pattern will persist into the week, with
a gradual warming trend peaking on Friday. Unsettled conditions
return this weekend.
&&
.SHORT TERM /TODAY THROUGH THURSDAY/...
An upper level low moving across Western Canada continues to
bring onshore flow across Western Washington. A dry cold front
associated with the upper level low has moved through, allowing
a colder air mass to situate over the region. High temperatures
today will be in the 50s.
Temperatures tonight into Wednesday morning are expected to get
chilly, with low temperatures dipping into 30s. Cooler overnight
temperatures near freezing, may promote the development of frost
across portions of Western Washington that may impact sensitive
vegetation. Highest confidence (70-90% chance) for frost is for
the southern interior, for which a Frost Advisory has been
issued to start late tonight.
A gradual warm up is expected to start on Wednesday and continue
late in the week as weak high pressure builds over Western
Washington. High temperatures will be in the mid 50s for the
coast and low 60s on Wednesday. By Thursday expect low 60s
along the coast and mid to upper 60s along the interior. Low
temperatures on Thursday morning will be in the mid to upper 30s
and Friday morning will be in the low 40s .
&&
.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
Dry conditions continue through Friday. Unsettled conditions
expected to return this weekend, as an upper level low moves
south from the Gulf of Alaska. However, there is uncertainty
regarding the track of the low. Some solutions favor the center
of the low to move into California, resulting in wet but slightly
drier conditions for Western Washington. Other models favor the
low to move over Oregon, resulting in a wetter solution for the
region through Monday.
29
&&
.AVIATION...
Westerly flow aloft becoming more northwesterly into Tuesday.
Onshore flow present as the lower levels early this morning as MVFR
and isolated IFR cigs develop in portions of Puget Sound. Confidence
in cigs at or below 3000 ft is around 40-60% through 16-18Z, with
more widespread scattering and VFR thereafter. Breezier NW winds
through the Strait of Georgia could also impact BLI late this
morning and into early afternoon. Interior terminals are expected to
transition from WSW flow to NNW flow this afternoon, occuring first
at northern terminals and progressing south between 21Z-00Z.
KSEA...MVFR cigs have made it to the terminal early this morning
with southwesterly surface flow. Expect the MVFR cigs to persist
through 12-14Z, becoming closer to low end VFR by the late morning.
More widespread scattering likely after 00Z. Winds will transition
to NW at 5-7 kts after 00Z, becoming NNE throughout the rest of the
valid TAF period.
21
&&
.MARINE...
All marine headlines have been retained as onshore winds continue
today, with high pressure building on the back end of a passing
front. Gales in the Strait of Juan de Fuca are still forecast to end
later this morning. Seas are still elevated, particularly in the
northernmost outer coastal zone up to 15 feet, subsiding to 10 feet
or less by 18Z this morning. Winds will slowly ease throughout the
rest of the day 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 expected in the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory from 11 PM this evening to 9 AM PDT Wednesday
for Foothills and Valleys of Thurston and Lewis Counties-
Lowlands of Lewis and Southern Thurston Counties-Middle
Chehalis River Valley-Olympia and Southern Puget Sound-
Willapa and Black Hills.
PZ...Small Craft Advisory until 2 PM PDT this afternoon 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 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 until 9 AM PDT this morning for Northern
Inland Waters Including The San Juan Islands.
Small Craft Advisory until 5 AM PDT early this morning for
Admiralty Inlet.
&&
$$
NWS SEW Office Area Forecast Discussion