Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 200317
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
820 PM PDT Fri Apr 19 2019

.SYNOPSIS...Scattered showers will decrease overnight. An upper
level ridge will give dry conditions to the area Saturday through
Sunday. The next front will give some rain to the area later Monday
through Tuesday with showers possibly persisting into Wednesday. Dry
weather is expected to return Thursday and Friday of next week.

&&

.SHORT TERM /TONIGHT THROUGH MONDAY/...Scattered showers will
decrease overnight and upper ridging will give dry conditions to
the area Saturday through Sunday. Low level onshore over the
weekend will probably make for night and morning clouds and temps
will be average. The global models show the next front
approaching on Monday with rain developing by Monday night.

.LONG TERM /TUESDAY THROUGH FRIDAY/...Models are generally in good
agreement that the best chances for rain across the area will be
Tuesday as a frontal system passes. Post frontal showers Tuesday
night will decrease or come to an end on Wednesday. Zonal flow
with dry conditions and low level onshore flow is expected to
prevail later next Wednesday or Wednesday Night through the end of
the week. Temperatures will be seasonal.

&&

.AVIATION...Scattered showers will taper off overnight. This evening
the lowest clouds are being reported near the Olympics, while
conditions have improved up and down the I-5 corridor--with some
clearing north of Seattle. There is still the last gasp of a
frontal band hung up over southwest Washington and about the south
half of the Cascades, but that will finally shift east overnight.
It is pretty likely that there will be areas of morning clouds and
then some afternoon sunshine on Saturday.

KSEA...The rain is ending this evening as a frontal band slowly
shifts east, a few showers might linger overnight. Morning clouds
should give way to afternoon sunshine on Saturday.

&&

.MARINE...Western flow in the Strait has been a bit weak so far, but
we may yet see a few hours of small craft westerlies this evening.
The flow will remain onshore through this weekend due to high
pressure over the NE Pacific. A frontal system will reach the area
Monday then weaken and move inland Monday night and Tuesday.

&&

.HYDROLOGY...With the rain diminishing and exiting the area,
rivers coming out of the north half of the WA Cascades have crested
while rivers coming off of the southern half of the WA Cascades
continue rising and will be cresting overnight but are expected to
remain well below flood stage. Going forward, river flooding is not
expected across the area for the next 7 days.

&&

.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 James Island To Point Grenville 10 To 60 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater 10
     To 60 Nm.

     Small Craft Advisory until 3 AM PDT Saturday for Central U.S.
     Waters Strait Of Juan De Fuca-Coastal Waters From Cape
     Flattery To James Island Out 10 Nm-Coastal Waters From
     James Island To Point Grenville Out 10 Nm-Coastal Waters
     From Point Grenville To Cape Shoalwater Out 10 Nm-East
     Entrance U.S. Waters Strait Of Juan De Fuca.

     Small Craft Advisory until midnight PDT tonight for West
     Entrance U.S. Waters Strait Of Juan De Fuca.

&&

$$

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