Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
105
FXUS66 KSEW 280332
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
832 PM PDT Mon Apr 27 2026
.SYNOPSIS...
Onshore marine air keep most of western Washington in the clouds
today into Tuesday with pockets of drizzle and a shower or two
at times. A ridge will push through Wednesday into Thursday with
more sunshine, with increased cloud coverage finishing the week
as a dry trough passes through. Stronger high pressure combined
with a thermal trough early next week may produce the first 80
degree weather of the year for western Washington.
&&
.SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/...
Forecast below is on track for the evening update. -HPR
Sunshine has vanished for most in western WA today as stronger
marine push continues. Satellite shows a meso low feature just
off the tip of Neah Bay rotating clouds across the coast,
rotating the clouds inland on the south side of the Olympics,
and pushing inland through the interior. There is evidence of a
break up of some of the clouds up in Whatcom County early this
afternoon, and this will likely spread southwards into the
interior this evening to at least give a few glimpses of the sun
before dusk. Clouds will fill in again tonight/Tuesday with
another overcast day expected. Couple pockets of drizzle/showers
cannot be ruled out either with the marine air. Temperatures
with the cloud coverage only climb into the upper 50s/low 60s,
with lows in the mid/upper 40s. Winds remain out of the
southwest around 5-10 mph.
A ridge moves over the region Wednesday, with increased
northerly flow aloft expected to disrupt the marine pushes.
Sunny skies are expected for much of the west side of the state
as the ridge passes overhead. Temperatures on Wednesday will be
a few degrees warmer with highs in the mid/upper 60s, and lows
Wednesday night in the low 40s/upper 40s. Couple pockets of
minor HeatRisk cover the Seattle metro into the south interior.
&&
.LONG TERM /THURSDAY THROUGH MONDAY/...
The ridge from Wednesday will continue to move eastward
Thursday. The day will start out sunny with clouds beginning to
return as a trough/cold front pass through the region dry. Cloud
coverage will remain into Friday/Saturday with onshore flow
behind the cold front. Temperatures dip from the upper 60s/low
70s Thursday into the mid/upper 60s Friday. Most ensembles are
showing a large bubble of high pressure forming just offshore
the Pacific Coast, with a large ridge extending into far
northern B.C. Canada. Depending on how strong a potential
thermal trough picks up along the coast underneath the ridge,
this could be the first chance western WA has of seeing high
temperates at or above 80 this season (looking at Sunday and
Monday). The lows during this time appear to cool still in the
upper 40s to low 50s, but will have to watch for pockets of
moderate HeatRisk with this warm and dry pattern coming up.
HPR
&&
.AVIATION...
North to northwest flow aloft will continue into Tuesday as an
upper trough over the Northern Rockies slowly progress eastward
and an upper ridge remains centered offshore. The low level flow is
light onshore. Low end VFR ceilings across much of the area this
evening are expected to lower back to areas of MVFR overnight into
Tuesday morning. A gradually lifting is expected once again
Tuesday afternoon.
KSEA...VFR ceilings are expected to lower back to MVFR overnight
and continue into Tuesday morning before lifting again in the
afternoon. Surface winds S/SW 7 to 10 knots into Tuesday morning
will ease Tuesday afternoon and gradually veer around to the
W/NW late in the day.
27
&&
.MARINE...
Broad surface ridging offshore and lower pressure over the interior
will maintain varying degrees of onshore flow throughout the week
ahead. A weak system approaching the region late Thursday or Friday
will enhance it enough for possible small craft advisory strength
westerlies in the central and east portions of the strait as well as
the outer coastal waters.
Steep seas continue over the outer coastal waters around 7-9 ft with
a dominant period of 8-9 seconds. These may persist into Tuesday
night before guidance suggests a couple of longer period swell
trains will arrive.
27
&&
.HYDROLOGY...
No river flooding is expected in the next seven days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 9 AM PDT Tuesday for Coastal Waters
From Cape Flattery To James Island 10 To 60 Nm-Coastal
Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10
To 60 Nm.
&&
$$
NWS SEW Office Area Forecast Discussion