FXUS66 KSEW 161613
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
913 AM PDT Fri Oct 16 2026

.SYNOPSIS...A ridge will bring dry and warm conditions today. 
Wetter and cooler weather arrives on Saturday. Sunday remains 
cool with more wet weather headed our way on Monday. Another 
front may reach us midweek. 

&&

.SHORT TERM /TODAY THROUGH SUNDAY/...Patchy, shallow, fog has 
formed once again this morning, especially in areas where the 
wind is calm. The fog will burn off later this morning. The 
previous discussion can be found below along with updates to the
aviation and marine sections: 

High pressure and offshore flow will lead to one more warm and 
dry day across western WA. East winds have peaked overnight with
40-50 MPH gusts in the Cascade ridges and 20-30 MPH in the 
gaps. Winds will continue to ease today. Temperatures will track
warmer than average with afternoon highs in the lower to mid 
70s. Expect 60s near the water. 

Friday night/Saturday will be cooler and wetter as the ridge 
shifts east and a front and trough move in from the west. The
bulk of the rain will fall tonight into Saturday morning and
mainly affect the coast and mountains. Showers with a
convergence zone are expected Saturday afternoon near the
King/Snohomish line. A few sunbreaks are expected outside the
convergence zone with afternoon highs in the 50s to lower 60s. 

We're in between systems on Sunday for cool but dry weather.
Sunday morning lows will be in the 30s and 40s with temps near
freezing around the south sound. Highs will be mostly in the
50s. 33

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...An upper level low
will spin offshore on Monday, with showers mainly clipping the
coast. This system will weaken as it shifts farther south on
Tuesday, with light/dry offshore flow across western WA. A weak
front dissipates as it reaches the region Wednesday night and
Thursday for a chance of light rain. 33

&&

.AVIATION...
A bank of shallow surface fog has arrived into the central Puget 
Sound area, impacting KSEA and at times, KBFI this morning. Areas of 
the southwest interior toward Olympia are also experiencing fog. 
Have opted to extend the fog duration for these areas until 17Z. 
Once the fog lifts, expect VFR cigs and visbys to return for the 
rest of the day. The next weak frontal system will arrive late 
tonight into Saturday for MVFR cigs. Light rain is expected through 
tomorrow morning, clearing up in the afternoon. 

KSEA...Fog has become entrenched in the south end of the terminal as 
part of a shallow bank hugging Puget Sound. The fog is shallow, but 
has been visibility reducing in areas directly under it. Cigs are 
down to around 300 ft. This will linger until 17Z before beginning 
to scatter out. Once it does, expect VFR cigs throughout the rest of 
the afternoon and light southwesterly surface flow. Light rain has 
been introduced to the terminal toward the end of the TAF period as 
the next weak frontal system moves through the area. 

21 

&&

.MARINE...
High pressure over the waters will weaken today. A frontal 
system will move through late tonight into Saturday morning. 
High pressure building over the waters Saturday afternoon will 
remain through Sunday. Another system will move by west of the 
coastal waters Monday. High pressure will rebuild over the area 
Tuesday. 

Small craft advisory westerlies in the Central and Eastern
Strait of Juan de Fuca Saturday. 

Seas 5 to 7 feet today building to 7 to 9 feet Saturday and
Sunday. Seas subsiding back down to 4 to 6 feet by Tuesday.

Felton/21

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 6 AM to 6 PM PDT Saturday for 
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance 
     U.S. Waters Strait Of Juan De Fuca.&&

$$