408 
FXUS66 KSEW 101634
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
915 AM PDT Wed Oct 10 2018

.SYNOPSIS...High pressure will give the region dry weather for the 
next week. Areas of night and morning fog or low clouds are likely 
at times. 

&&

.SHORT TERM...Western Washington has a few areas of clouds and some 
fog patches this morning. Low clouds and fog are mainly in the Puget 
Sound basin and southwest Washington. There are some mid level 
clouds moving south in the northerly flow aloft--especially over 
Whatcom, Skagit and Snohomish counties and over the Cascades. There 
should be more sunshine this afternoon, but it will probably be a 
couple days before the air dries out--and the air aloft is still a 
bit cool, but it will be warming slowly over the next few days. A 
weather system will pass by to the north of the area Thursday night 
and Friday--but it is not expected to have much effect on Western 
Washington. Light northerly low level flow should become more 
easterly with time and increase. This pattern is good for night and 
morning fog for the lowlands, especially the usual valley locations. 

.LONG TERM...Dry weather will continue into next week with the 
strong upper ridge offshore at first, but then possibly shifting 
right over Washington by the middle of next week. Low level offshore 
flow will keep the air warm and dry except for some night and 
morning fog in the usual valley locations. The air aloft will be 
warming if the ridge does indeed shift east over our area--the GEFS 
ensemble mean gets up around 14c next Wednesday.

&&

.AVIATION...Moderate northerly flow aloft through Thursday due to
a high amplitude pattern, however upper ridging will settle in
from the northwest. The air mass will be stable, with drying
taking place. However, overnight and morning fog will again be
possible on Thu AM due to boundary layer moisture and clear skies
above. This morning's fog appears to be quite shallow. So even
with light wind, has already started burning off in some
locations, and it should burn off readily in remaining locales 
late this morning.

KSEA...This morning's fog appears to be quite shallow, which will
help vsby to continue improving. Fog risk is in the process of
ending now, though some lingering low stratus remains possible
until about noon. After that, clear skies and light northerly wind
are expected through this evening. Late tonight and Thursday
morning, fog re-development appears likely. Should again be
shallow, with burnoff late Thu morning.  Haner

&&

.MARINE...Light northerly offshore flow will prevail through
Thursday morning, becoming northerly onshore flow late Thursday
through Friday. Stronger northerly offshore flow will develop
Friday night and Saturday morning, with small craft strength
easterlies possible near the West Entrance and Grays Harbor. 

Areas of fog will be possible each day through Saturday morning 
during the overnight and morning hours. Haner

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&

$$

www.weather.gov/seattle