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594
FXUS66 KSEW 220332
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
832 PM PDT Fri Jun 21 2024

.SYNOPSIS...After a warm day today, onshore flow will increase
over the weekend allowing for slight cooling Saturday and much
more cooling on Sunday. Showers will also return by Sunday. While
temperatures will rebound slightly early next week, temperatures
will remain mild with occasional chances for precipitation.

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.SHORT TERM /TONIGHT THROUGH TUESDAY/...
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Increasing mid and upper
level clouds this evening as a frontal system approaches from the
NE Pacific. Temperatures have eased from the daytime high, mostly
the upper 70s to near 80 through the interior, cooler along the
waterways. A few showers will develop tomorrow morning over the
waters and into the North Coast, but accumulations will be
minimal. Onshore flow will increase going into this weekend.
Highs on Saturday will be 2-5 degrees cooler than the highs today,
while Sunday will see more significant cooling with temperatures
in the 60s. Areas of precipitation and breezy conditions will
accompany these cooler temperatures on Sunday, with gusts of
20-25mph during the day. Weak ridging tries to build in again
Monday into Tuesday allowing a rebound in temperatures back to
near to above normal.

.LONG TERM /WEDNESDAY THROUGH SATURDAY/...After another mild and
likely pleasant day on Tuesday, the door will remain open for
additional weak systems to roll through the region next week. This
will keep temperatures in check and bring an occasional chance of
precipitation to the region. At this time no significant weather
hazards are anticipated.

Wolcott/LH
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.AVIATION...
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West-southwest flow aloft will continue through Saturday
as ridging over the area slowly slides east. VFR high clouds for
most tonight with high pressure in place. Stratus into Saturday
morning will mainly be confined to the coast, and is unlikely to
make it to KSHN/KOLM tonight. Generally LIFR/IFR cigs with the
stratus along the coast. Cigs will slowly lower Saturday night.
Light winds tonight will increase from the S/SW on Saturday with
increasing onshore flow across the area.

KSEA...VFR cigs with high clouds at times through Saturday. Light
N/NE winds will continue into tonight before becoming more S/SW
around 11-12z Saturday.

JD
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.MARINE...
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High pressure over the coastal waters with lower
pressure inland today. Winds relatively light over most
waters, but expect a westerly push through the Strait of Juan de
Fuca this evening. The current advisory is unchanged. Meanwhile,
seas over the coastal waters remain rather steep as a short-period
wave group dominates. A passing disturbance Saturday will bring a
stronger push of west winds through the Strait tomorrow evening.
While guidance does suggest this will be stronger than today`s
winds, the likelihood of widespread gales through the Strait remains
lower (closer to 50%). As a result, have maintained the current gale
watch and will wait until a future update to make the determination
of SCA or gale warning for this upgrade.

Looking ahead to next week, high pressure remains situated over the
waters with no significant winds expected at this time. Seas will
build closer to 8 feet by Monday morning, though, as a larger west
wave group arrives. Seas then subside through the remainder of the
forecast period.

Cullen
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.FIRE WEATHER...
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Temperatures will be warm through Saturday, with
many locations in the Cascade foothills and high ridges achieving
relative humidity values of 15 to 25 percent. This drier pattern
will be short lived as onshore flow and a weak weather system
returns on Sunday and brings up the relative humidity values.
Unsettled weather is expected late next week as the offshore low
pressure system remains in the area. This will be evaluated by
early next week for any potential for lightning or additional
rainfall.

Kristell
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&&

.SEW WATCHES/WARNINGS/ADVISORIES...
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WA...None.
PZ...Small Craft Advisory until 5 AM PDT Saturday for Central U.S.
     Waters Strait Of Juan De Fuca-East Entrance U.S. Waters
     Strait Of Juan De Fuca.

     Gale Watch from Saturday evening through late Saturday night for
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.
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