Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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880
FXUS66 KSEW 241612
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
912 AM PDT SUN JUL 24 2016

.SYNOPSIS...High pressure will bring dry and mild weather today
and Monday. A weak system will move by Monday night bringing some
marine air into the interior for Tuesday. The ridge will
strengthen Wednesday into the end of the work week with the
warmest temperatures of the month expected Thursday and Friday.

&&

.SHORT TERM...High pressure will bring dry and mild weather to
Western Washington today. There are patchy low clouds on the
North Coast and the Admiralty Inlet area, otherwise skies are
clear. Temperatures will reach the upper 70s to lower 80s in the
interior with lower 70s along the coast.

A weak cold front will move inland on Monday which will flatten
the ridge over the Pac NW. But temperatures will still be a few
degrees above normal with highs near 80 in the interior. Isolated
showers may develop over the North Cascades but the rest of the
CWA looks dry. Low level stratus clouds will push farther inland
Monday night as onshore flow increases. Tuesday will be cooler
with the marine push with temperatures closer to normal. 33

.LONG TERM...Previous Discussion...Extended models in good
agreement with the upper level ridge strengthening over Western
Washington Wednesday and Thursday. 500 mb heights near 590 dms by
late Thursday afternoon with the 500 mb heights remaining in the
mid to upper 580 dms on Friday. Temperatures aloft warming with
model 850 mb temperatures peaking out on Friday near plus 20c.
Surface gradients never turn offshore and remain northwesterly.
This will put a cap on the high temperatures. Highs on Wednesday
in the 70s to mid 80s will warm to the mid 70s to near 90 for
Thursday and Friday. Thursday and Friday will be the warmest days
in July. Extended models also in good agreement with a weak upper
level trough approaching the coast on Saturday. This will increase
the low level onshore flow resulting in some cooling of the high
temperatures on Saturday by a few degrees with the warmest
locations dropping back into the mid 80s. Felton

&&

.AVIATION...High pres aloft will remain over the region for light
wly flow aloft through tonight. Contd weak low level onshore
flow. Localized LIFR CIGs/MVFR vsbys will dissipate by 1800 UTC.
Anticipate areas of IFR CIGs over the coast after 0600 UTC Mon.

KSEA...VFR. Winds will be nly near 10 knots this afternoon through
this evening.

&&

.MARINE...High pressure offshore with lower pressure east of the
Cascades will keep the flow onshore through Tuesday. The flow will
strengthen on Monday for gale force winds over parts of the Strait
of Juan de Fuca Monday night. Expect the flow to weaken some on
Tuesday.

&&

.SEW Watches/Warnings/Advisories...
WA...None.
PZ...Small Craft Advisory from 6 PM to 11 PM PDT this evening for
     Coastal Waters From James Island To Point Grenville Out 10
     Nm-Coastal Waters From Point Grenville To Cape Shoalwater
     Out 10 Nm.

     Small Craft Advisory from 6 PM this evening to 6 PM PDT Monday
     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 from 5 PM this afternoon to 5 AM PDT Monday
     for Central U.S. Waters Strait Of Juan De Fuca-East
     Entrance U.S. Waters Strait Of Juan De Fuca.

&&

$$

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You can see an illustrated version of this discussion at
www.weather.gov/seattle/gafd/latest_webafd.html



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