Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
831
FXUS66 KSEW 280947
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
247 AM PDT Tue Apr 28 2026
.SYNOPSIS...
Another round of onshore flow and stratus clouds are expected
today, with light drizzle expected at times. High pressure noses
back in Wednesday and Thursday for clearing skies and warming
temperatures. Increased cloud cover is again expected late in
the week as a dry front moves through the region. Stronger high
pressure and offshore flow is indicated for next week.
&&
.SHORT TERM /TODAY THROUGH THURSDAY/...
Nighttime satellite products show lower clouds and stratus
across western Washington as onshore flow continues. Expect
another day of clouds and isolated pockets of drizzle today with
cooler temperatures in the upper 50s and low 60s. Afternoon
highs from Wednesday through the end of the week are suggestive
of minor HeatRisk. After today, high pressure builds into the
area for the middle of the week, gradually decreasing the cloud
cover and bringing the temperatures back into the upper 60s and
even low 70s by Thursday. Outside of diurnal westerly winds
through the Strait of Juan de Fuca, much of the Puget Sound
region should see light northerly winds.
A dry front will progress through on Thursday as the high
pressure scoots east, bringing clouds back in the later half of
the day.
&&
.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
After the dry front moves through late Thursday, clouds and
onshore flow are expected to linger into Friday, cooling the
temperatures a few degrees into the mid 60s. Skies clear and
conditions quickly warm up over the weekend, with temperatures
near 80 possible by Sunday. Probabilistic HeatRisk guidance is
suggestive of those temperatures corresponding to at least a
20-30% chance of the moderate category in the Seattle-Tacoma
Metro area, with greater chances west of Olympia and into the
western Puget Sound region. This forecast can and will change
and the corresponding HeatRisk metrics will continually be
assessed.
The extended range forecast is suggestive of the development of
an amplified ridge along the west coast that extends into next
week. As the high strengthens, a thermal trough will develop
along the coast and aid in those temperatures getting up to
around 80 through Monday, gradually cooling off into the 70s on
Tuesday.
21
&&
.AVIATION...
High pressure remains offshore today with low level
onshore flow at the surface. A weak disturbance in the north
flow may generate isolated light showers, mainly along the coast
and in the mountains. Ceilings are a mixed bag with VFR and
pockets of MVFR conditions. The trend is for lifting and
scattering of low clouds today but still remain SCT-BKN around
5000 ft. Clouds will continue to lift and gradually scatter
overnight and into Wednesday morning. 33
KSEA...SCT-BKN ceilings around 5000 ft today with brief MVFR
conditions possible this morning. S/SW wind around 10 kt
becoming W and NW/N around 5 kt after 00z. 33
&&
.MARINE...
High pressure remains offshore with lower pressure
inland, maintaining onshore flow. A stronger onshore push is
forecast down the Strait of Juan de Fuca Thursday afternoon and
evening with cold front. 33
&&
.HYDROLOGY...
No river flooding is expected over the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion