Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
232
FXUS66 KSEW 031145 CCA
AFDSEW
Area Forecast Discussion...CORRECTED
National Weather Service Seattle WA
445 AM PDT Fri Apr 3 2026
.SYNOPSIS...
Weak system moving by to the north today. Upper level ridge
building tonight into the weekend. Ridge shifting east Sunday
night. Another weak system will move by to the north Monday
night and Tuesday. Dry upper level trough over the area
Wednesday and Thursday.
&&
.SHORT TERM /TODAY THROUGH SUNDAY/...
Satellite imagery shows cloudy skies for Western Washington
this morning. Doppler radar has some light showers over the
north coast and Northwest Interior associated with a weak
shortwave moving into Vancouver Island. Temperatures at 2 am/09z
were in the 40s.
Weak shortwave moving by to the north today with a chance of
showers along the north coast and over the interior from about
Everett northward. For the remainder of the area cloudy skies to
start with a little bit of sunshine in the afternoon. Highs in
the mid to upper 50s.
Upper level ridge beginning to build over the area tonight with
the ridge continuing to build through Saturday. Clearing skies
will allow temperatures to drop Saturday morning into the 30s
in many locations. Low level flow turning offshore Saturday
marking the beginning of a brief warming trend. Highs in the lower
to mid 60s.
Low level offshore flow with the upper level ridge over the
area Saturday night into Sunday. The ridge axis slips off to
the east turning the day Sunday turning the flow aloft
southwesterly. This will push some high clouds over the area.
Lows in the lower to mid 40s. Highs in the 60s and lower 70s.
Felton
&&
.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
Monday looks to be the warmest day in this short warm spell for
the interior even with the upper level ridge axis well to the
east. Low level flow turning onshore cooling highs on the coast
down 5 to 10 degrees, into the mid 50s to lower 60s. Marine air
not reaching the interior in time to cool things off. Highs
again in the 60s and lower 70s.
Classic marine push scenario Monday night with an upper level
shortwave moving by to the north increasing the low level
onshore flow. Stratus along the coast moving inland in the early
morning hours. Highs 10 degrees or so cooler Tuesday for the
interior, in the mid to upper 50s. Highs on the coast in the
lower to mid 50s.
Dry upper level trough moving down out of the north settling
over the area Wednesday and Thursday. Low level onshore flow
weakening Tuesday night. This combined with the dry northerly
flow aloft making a couple of sunny days in the middle of next
week. Highs near normal, mid 50s to lower 60s.
Lows in the lower to mid 40s Monday and Tuesday morning cooling
into the 30s with less cloud cover Wednesday and Thursday
morning. Frost advisories may once again be needed for the
Southwest Interior.
&&
.AVIATION...
West/northwesterly flow will persist aloft through the day as
weak upper level ridging builds into the area. Conditions across
the area terminals remain mostly VFR with mid and high level
clouds filtering in overhead. Showers continue across Snohomish
and Skagit counties early this morning as a weakening convergence
zone slowly lifts northward. A weak frontal system will clip
the northern portion of the area today and may bring some
additional light shower activity for areas along the North
Coast and across the North Interior. Ceilings, especially for
terminals from KPAE northward, may drop to MVFR this morning for
a few hours, before lifting and improving towards FEW/SCT from
south to north through the afternoon. Southerly surface winds
persisting at 5-10 kt will transition to light northerly by
this evening, likely between 00-06Z Sat.
KSEA...VFR conditions early this morning with mid and high cloud
cover streaming in overhead. The probability of MVFR cigs developing
at the terminal this morning peaks between 11-18Z at around 20
percent. Clouds will scatter and become FEW/SCT by late Friday
afternoon- evening. Southerly surface winds persisting between
5-10 kt today will become light around 5 kt or less and shift
to the north between 02-05Z Sat.
14
&&
.MARINE...
High pressure will continue build over the area waters today as
a weak frontal system passes to the north and clips the northern
coastal waters. Overall, do not expect much in the way of impacts
for the area waters with this system. Seas currently hovering
between 7-9 ft will continue to subside towards 4-7 ft through
the morning and will stay within this range through the weekend.
High pressure will remain situated over the area waters over
the weekend, while a thermally induced trough over Oregon builds
northward along the coast. This will allow for flow to turn
northerly or weakly offshore at times on Saturday and Sunday.
Flow will then switch back to onshore early next week as the
next frontal system passes to the north. A strong westerly push
is possible along the central and eastern Strait of Juan de
Fuca Monday night into Tuesday. Seas across the coastal waters
will build towards 7-10 ft Tuesday into Wednesday. Flow will
then return to northerly or become weakly offshore at times
Wednesday and Thursday as lower pressure remains situated over
the area and high pressure remains situated over the northeast
Pacific.
14
&&
.HYDROLOGY...
No river flooding the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 9 AM PDT this morning 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...None.
&&
$$
NWS SEW Office Area Forecast Discussion