Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
211
FXUS66 KSEW 290317
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
817 PM PDT Tue Apr 28 2026
.SYNOPSIS...
Cool and cloudy conditions will continue into tonight. High
pressure will nose back into the region on Wednesday for clearing
skies and warming temperatures. Another round of increased
cloud cover and stronger onshore flow is expected late Thursday
into Friday as a dry front moves across the area. High pressure
and offshore flow are on tap for the area late in the weekend
into early next week.
&&
.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...
Current forecasts are on track. Previous discussion follows with
update to aviation portion. 27
Stratus remains draped across much of western Washington this
afternoon, with temperatures remaining cool in the low to mid
50s. Cloudy conditions will continue through this evening, with
cloud cover expected to gradually clear during the overnight
period. Areas of fog will be possible in any areas of clearing
overnight and a few isolated pockets of frost will be possible
across the Chehalis Valley as temperatures dip into the mid 30s
by early Wednesday.
High pressure will then build into the area on Wednesday and
remain situated over the area into Thursday, allowing for
temperatures to warm across the region. Afternoon highs will
likely warm back into the upper 60s to low 70s by Thursday,
bringing widespread Minor HeatRisk to areas primarily south of
Everett and along the Cascade valleys. Outside of diurnal
westerly winds through the Strait of Juan de Fuca, much of the
Puget Sound region should see light northerly winds. Cloud cover
will increase again late Thursday as a dry front approaches the
area.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
A dry front moving through the region late Thursday into Friday
will bring increasing onshore flow and more cloud cover to the
area again by Friday. Temperatures will cool a few degrees,
topping out into the mid 60s for afternoon highs as a result.
Skies will then clear and conditions will quickly warm up over
the weekend, with temperatures near 80 possible by Sunday as
high pressure builds back into the region and a thermal trough
builds northward along the coast. Periods of offshore flow will
develop as a result. Probabilistic HeatRisk guidance continues
to suggest those temperatures corresponding to at least a 20-30%
chance of the moderate category in the Seattle-Tacoma Metro
area, with greater chances across the Southwest Interior.
High pressure over the region will keep temperatures warm into
Monday, with Monday likely seeing afternoon highs similar to
Sunday- in the upper 70s to low 80s. Temperatures then start to
cool by Tuesday as onshore flow is reintroduced into the area.
&&
.AVIATION...
North to northwest flow aloft continues into Wednesday as an upper
ridge offshore gradually builds into the region. Light onshore flow
near the surface will turn more northerly by Wednesday afternoon.
Areas of MVFR ceilings are expected to reform along the coast
overnight and locally inland from around KPWT westward. VFR is
expected areawide from 18Z onward on Wednesday.
KSEA...Satellite trends suggest that VFR overcast will continue to
thin this evening then scatter out overnight. VFR with mostly clear
skies is expected on Wednesday. Surface winds light W/NW will shift
N/NE overnight then become N/NW 7 to 10 knots Wednesday afternoon.
27
&&
.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.
Seas generally 5-8 ft today and tonight with some locations in the
far outer waters increasing to 8-10 ft late tonight and early
Wednesday morning. These spots are not expected to be large enough
to warrant any SCA headlines at this time, especially since they`re
expected to be diminished by mid-morning. Otherwise, seas remain
within the aforementioned range at least into Thursday afternoon.
18/33
&&
.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