Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 260945
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
245 AM PDT Fri Apr 26 2019

.SYNOPSIS...After one more dry day today, an upper trough will
bring a chance of showers and cooler weather to the region tonight
and Saturday. Sunday looks dry, but another upper trough will
remain near the region and could bring scattered showers each day
next week.

&&

.SHORT TERM /TODAY THROUGH SUNDAY/...Today looks dry with west to
northwest flow aloft and increasing low level onshore flow. There
should be plenty of sunshine after high clouds currently over the
area push off to the east in a few hours. Highs will be near
normal.

An upper trough will cross the area tonight and Saturday. This
will bring a good chance of showers, especially Saturday. Snow
levels will drop to 2000-3000 feet and the mountains could pick up
1-3 inches but probably little if any accumulations on roadways
with late April sunshine. A Puget Sound Convergence Zone is also
likely on Saturday. Highs will cool to a few degrees below
normal...mostly in the 50s.

The upper trough will shift inland Saturday night and Sunday with
drier northerly flow aloft developing. Showers should end Saturday
evening with decreasing clouds Saturday night. Sunday should be
mostly sunny with highs near normal again. Schneider

.LONG TERM /MONDAY THROUGH THURSDAY/...A series of weak upper
trough will keep a slight chance of showers in the forecast at
times through the period but no major or organized weather systems
are expected. The best chance for showers will probably be on
Monday. After that, it looks largely dry even through a stray
showers cannot be completely ruled out at times. Highs will be
near to slightly above normal with Tuesday probably the warmest
day. Schneider

&&

.AVIATION...Northwesterly flow aloft continues as a weak upper
level trough crosses the region early this morning. The air mass
is relatively dry and stable. Onshore flow will increase through
the afternoon with breezy westerly winds. Patchy low clouds
possible through the morning hours along the coast, otherwise VFR
is expected. Mid-level clouds around Friday night into Saturday as
an upper level trough pushes through.

KSEA...VFR conditions continue. Some high clouds around through
today with mid-level clouds tonight. Winds becoming S/SW between
11-14z and increasing to 10-15 knots by 18z. Gusts up to 22 knots
possible through the afternoon. JD

&&

.MARINE...Strong onshore flow will develop midday and continue
into tonight as an upper level trough moves through the area.
Gales possible through the Strait of Juan de Fuca and Small Craft
Advisory winds are expected elsewhere. Onshore flow will ease late
Saturday. Northerly flow will develop on Sunday as a front moves
southward through the area. JD

&&

.HYDROLOGY...The daily hydrology discussion has ended until the
start of the next rainy season; it will only be updated as needed
until then.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 11 PM PDT Saturday for Coastal Waters
     From Cape Flattery To James Island 10 To 60 Nm-Coastal
     Waters From Cape Flattery To James Island Out 10 Nm-Coastal
     Waters From James Island To Point Grenville 10 To 60 Nm-
     Coastal Waters From James Island To Point Grenville Out 10
     Nm-Coastal Waters From Point Grenville To Cape Shoalwater
     10 To 60 Nm-Coastal Waters From Point Grenville To Cape
     Shoalwater Out 10 Nm.

     Small Craft Advisory from 3 AM to 11 PM PDT Saturday for Central
     U.S. Waters Strait Of Juan De Fuca-East Entrance U.S.
     Waters Strait Of Juan De Fuca.

     Gale Warning from noon today to 3 AM PDT Saturday for Central
     U.S. Waters Strait Of Juan De Fuca-East Entrance U.S.
     Waters Strait Of Juan De Fuca.

     Small Craft Advisory from 2 PM this afternoon to 3 AM PDT
     Saturday for Admiralty Inlet-Northern Inland Waters
     Including The San Juan Islands-Puget Sound and Hood Canal.

     Small Craft Advisory until 11 PM PDT Saturday for West Entrance
     U.S. Waters Strait Of Juan De Fuca.

     Small Craft Advisory until noon PDT today for Central U.S.
     Waters Strait Of Juan De Fuca.

&&

$$

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