Kent, Washington Weather Forecast Discussion

801
FXUS66 KSEW 250335
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
835 PM PDT Wed Sep 24 2025
.SYNOPSIS...Zonal flow will bring in more fall-like conditions
across western Washington through the remainder of the week, with
cooler temperatures and periods of cloudy skies. Periods of
showers are possible Friday and Saturday before more widespread
rain enters the region on Sunday and Monday. Unsettled and cooler
conditions are favored to continue into next week.
&&
.SHORT TERM /TONIGHT THROUGH SATURDAY/...Onshore prevails tonight
with cooler conditions on Thursday - highs in the 60s.
Previous discussion...An upper level ridge over the western US
will flatten throughout the remainder of the week as an upper
level trough moves inland over British Columbia. Zonal flow will
develop over western Washington by the afternoon today, generating
onshore flow that will bring periods of cloudy skies and cooler
temperatures. This shift to westerly winds will also help to push
any remaining smoke to the east side of the Cascades by this
evening. While temperatures today are on track to reach the mid
70s across much of the lowlands, stronger onshore flow Thursday
will lower temperatures by several degrees, with most areas
struggling to surpass the mid 60s.
As a deepening upper low in the Gulf of Alaska advects moisture
towards the west coast of Canada, some shower activity may graze
the northern portion of western Washington on Friday and Saturday,
particularly along the northern Olympic Peninsula, over the San
Juan Islands, and northern interior. Rainfall amounts will
generally be light, with the highest rain likely over the
northwestern Olympic Peninsula. Temperatures Friday and Saturday
will
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...A frontal system is on
track to cross the region on Sunday, bringing widespread rain and
cooler temperatures to the region that will linger into next
week. Between Sunday and Monday, ensembles are showing potential
for a half inch or more of rainfall across the lowlands and up to
2 to 3 inches of liquid over the mountains. Another trough will
follow close behind, maintaining chances for rain through the
middle of next week. By the beginning of next week, temperatures
will peak in the low to mid 60s across the lowlands.
15
&&
.AVIATION...Southwest flow will increase aloft into Thursday as the
upper ridge axis shifts eastward. Clear skies for most areas of
Western Washington this evening with LIFR stratus moving east in the
Strait of Juan de Fuca. Weak onshore flow tonight is expected to
allow for areas of IFR/LIFR stratus to develop over Puget Sound, as
well as the coast. Confidence remains lower in how widespread low
cigs will be Thursday morning, however, LIFR/IFR cigs remain
possible for most sites. In addition, localized fog may develop,
with reduction in vsbys in these areas, as well as in low stratus.
Low cigs will lift late Thursday morning, with increasing mid and
high clouds at times on Thursday. Light winds tonight will increase
from the W/NW Thursday afternoon.
KSEA...Clear skies this evening. Stratus may develop across portions
of Puget Sound late tonight into Thursday morning, resulting in
areas of IFR/LIFR cigs. Probabilities of IFR cigs peak around 20%
between 12 to 18z on Thursday. Any stratus will slowly clear midday
Thursday, with continued VFR mid and high clouds at times Thursday
afternoon. North surface winds into tonight may become VRB for a
period Thursday morning before increasing from the NW in the
afternoon. JD
&&
.MARINE...Surface high pressure over the coastal waters this
afternoon will lead to an increase in onshore flow later this
evening. Increasing northwesterlies over the coastal waters will
keep the small craft advisory in place for the outer coastal
waters, and the southern inner coastal waters for a combination of
winds and choppy seas. Onshore flow continues into Thursday where
a westerly push down the Strait of Juan De Fuca may warrant a
small craft advisory depending on the strength of the winds. A
stronger front looks to reach the area Sunday night into Monday
which could yield potential impacts for the area waters including
headlines.
Combined seas 7 to 9 feet this afternoon decreasing briefly
Thursday evening before building back up to 8 to 11 feet by Friday
evening and hovering throughout first part of the weekend.
Mazurkiewicz
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 11 AM PDT Thursday 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-Coastal Waters From Point Grenville To Cape
     Shoalwater Out 10 Nm.
&&
$$

NWS SEW Office Area Forecast Discussion