Fox Island, Washington Weather Forecast Discussion

166
FXUS66 KSEW 231548
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
848 AM PDT Tue Sep 23 2025
.SYNOPSIS...Conditions will trend drier and warmer across
Western Washington through midweek. Light winds under high
pressure may bring the return of smoke aloft at times from area
fires. The warmest days are likely Tuesday and Wednesday, with
typical late September weather returning as temperature trend
toward normal and approaching disturbances bring rain chances
back to the region by late Friday and especially deeper in the
weekend.
&&
.SHORT TERM /TODAY THROUGH THURSDAY/...The latest forecast remains
on track with no updates this morning. High pressure continues to
build in place over the region today and tomorrow. This will
provident for plenty of sunshine and temperatures warming back
into the 70s for most of the interior lowlands of western
Washington. Weak offshore flow is likely to develop today and
tomorrow, with the potential for some smoke from fires across the
region to move into the area. Not much change into Wednesday as
the ridge remains in place and another mild and sunny day is
expected. The ridge begins to weaken towards Thursday with a
return of onshore low-level flow as the upper level flow becomes
more zonal. This will bring temperatures back down a few degrees,
and spread some additional cloud cover into the region. However,
this initial disturbance appears quite weak and little if any
precipitation is expected.
.LONG TERM /FRIDAY THROUGH MONDAY/...Looking ahead, ensemble
guidance remains somewhat split with the evolution of the pattern
late this week and into the weekend. Ensemble members remain
rather evenly split into two camps - one keeping the majority of
the precipitation from the region into the start of the weekend,
while the other would allow some leading moisture to work onshore
by late Friday. Nevertheless, there`s more significant agreement
that another more widespread push of moisture crosses western
Washington by Sunday. Temperatures likely to remain near
seasonally normal values this weekend into the start of next week.
&&
.AVIATION...An upper level ridge remains over the region
today with west to southwest flow aloft. The low level flow is
weakly offshore. Apart from patchy LIFR stratus in some of the river
valleys this morning, VFR conditions will prevail.
KSEA...Clear skies. Surface winds light N/NE this morning will
become northerly 8 to 11 knots this afternoon.
27
&&
.MARINE...Thermally induced low pressure along the coast will shift
inland tonight and Wednesday as a broad surface ridge offshore
expands into the coastal waters. This will lead to increasing
onshore flow. A dissipating frontal system will reach the area at
the end of the week.
27
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$

NWS SEW Office Area Forecast Discussion