Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
014
FXUS66 KSEW 290924
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
224 AM PDT Wed Apr 29 2026
.SYNOPSIS...
High pressure will resume today for warmer temperatures and
sunnier skies today. A weak, dry front will progress through the
region late Thursday into Friday for another round of cloud
cover and reduced temperatures, but high pressure amplifies over
the weekend and into early next week.
&&
.SHORT TERM /TODAY THROUGH FRIDAY/...
Expect a much sunnier day with temperatures climbing into the
upper 60s as high pressure returns to the region. Winds will be
light and generally out of the north. A break in the high
pressure pattern is in store for late Thursday into Friday as a
weak front moves through the region. This will bring an increase
in cloud cover and a few degrees cooler on Friday. Temperatures
on Thursday will be in the low 70s, approaching the upper 70s in
the Chehalis Valley. This corresponds to minor HeatRisk through
Friday.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Clouds will stick around through Friday night, though the
temperatures will still be pleasant in the upper 60s and low
70s. High pressure developing along the west coast will continue
to amplify late in the week and into the weekend. Clearing skies
and thermal trough developing along the coast are increasing
confidence in temperatures climbing to the 80s by Sunday. The
locations with the highest likelihood of seeing the upper 80s
will be the Chehalis Valley and some of the Cascade valleys.
This is also suggesting a 30-40% chance of moderate HeatRisk in
areas generally south of the Seattle Metro area, and above 50%
in the aforementioned warmer locations. In addition to the
temperatures climbing, afternoon relative humidity values will
be decreasing. Right now, the forecast calls for minimums on
Sunday afternoon of 28-38%. While not in the peak of our dry
season, it`s never too early to start taking extra precautions
around sources of ignition and mitigating those.
Temperatures will remain warmer through Monday before
decreasing a few degrees on Tuesday as onshore flow returns and
the ridge begins to flatten.
21
&&
.AVIATION...
High pressure will shift inland today with a dry and
stable air mass over western WA. Skies are mostly clear along
the coast with a BKN-OVC layer around 6000 ft in the interior.
This layer will scatter out this afternoon for VFR conditions
across the board. Low clouds may return to the coast overnight
and into Thursday morning. 33
KSEA...VFR today with a cloud layer around 6000 ft this morning.
Skies becoming mostly clear this afternoon. Light N wind around
5 kt this morning and 5-8 kt this afternoon/evening. 33
&&
.MARINE...
High pressure is offshore with lower pressure inland,
maintaining onshore flow across western WA. A stronger push down
the strait is expected Thursday afternoon and evening with a
weak front. The flow turns more N to NE (and offshore) over the
weekend with low pressure to our south. 33
&&
.HYDROLOGY...
No river flooding is expected in the next seven days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion