Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 241059
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
259 AM PST Tue Jan 24 2017

.SYNOPSIS...High pressure aloft will bring dry weather today. A
weak frontal system will bring clouds and maybe spotty rain
Wednesday and Thursday. High pressure aloft will rebuild over the
area Friday and Saturday with a weak front moving through on
Sunday.

&&

.SHORT TERM...An upper ridge will be over the area today for dry
weather. Areas of fog this morning should at break up later
today. Low clouds this morning should also lift and decrease by
afternoon but they probably won`t go away entirely. A very weak
frontal system will bring clouds and maybe some spotty showers
Wednesday and Thursday. It also might simply be dry for most of
the area, especially on Thursday as the front dissipates offshore
and high pressure aloft rebuilds over the area. Schneider

.LONG TERM...An upper ridge will be over the area Friday and
Saturday for dry weather. The possible exception will be the
north coast and perhaps far north interior where a warm front
clipping the area could bring a little rain on Friday. A frontal
system will move through the area on Sunday for at least a chance
of rain all areas. The upper ridge will bounce back up over the
area on Monday for another dry day. Schneider

&&

.AVIATION...An upper level ridge will prevail over the region
today for contd nly flow aloft. The low level flow will remain
nearly flat. Meanwhile, areas of LIFR CIGs/VSBYs are expected to
lift or dissipate by 1900 UTC. Anticipate areas of MVFR CIGs to
dissipate by 2200 UTC.

KSEA...The forecast for the terminal early this morning is tough.
There were areas of LIFR CIGs and/or VSBYs in the Puget Sound
Region. There also appeared to be a less extensive stratocumulus
deck with bases in the MVFR category (020-030) floating around
early this morning. Latest model guidances were indicating either
MVFR CIGs and/or VSBYs over the terminal this morning or VFR
conditions. At this time, leaning towards VFR as the prevailing
condition.

&&

.MARINE...High pressure over the area will result in nearly flat
flow through this evening. Light easterly flow will develop late
tonight due to pressure falls over the offshore waters. This flow
will persist on Wednesday. Stronger pressure falls offshore with a
1038 mb high along the WA/ID border will cause the flow to
strengthen slightly from the southeast on Thursday.

Meanwhile, expect westerly swells to build to over 10 feet again
on the coastal waters and west entrance to the Strait of Juan de
Fuca on Wednesday and then begin to gradually subside late
Thursday.

&&

.HYDROLOGY...River flooding is not expected for the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory for hazardous seas until 4 AM PST early
     this morning 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 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.

&&

$$

www.weather.gov/seattle

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



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