565 
FXUS66 KSEW 110310
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
810 PM PDT Wed Oct 10 2018

.SYNOPSIS...High pressure over the region will allow for mostly 
clear skies and dry weather to continue into next week. Areas of fog 
or low clouds during the overnight and early morning hours are 
likely at times...especially in prone areas. 

&&

.SHORT TERM...Clear skies generally the rule over much of W WA this 
evening although obs at HQM are starting to show the first inklings 
of fog development. With clear skies...light winds and plenty of low 
level moisture over the area...likely to see fog development in the 
more prone areas during the overnight with stratus and the potential 
for some fog possible in the I-5 corridor as well.

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 and increase in strength somewhat into the 
weekend. This pattern will keep the threat of overnight/early 
morning fog in the forecast for the lowlands, especially the usual 
valley locations. SMR/MM

.LONG TERM...From Previous Discussion...Dry weather will continue 
into next week with the strong upper ridge offshore at first, but 
then shifting 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. I wouldn't be 
surprised if Seattle warmed to the lower 70s by the middle of next 
week--but that isn't in the forecast quite yet. After the recent 
bout of rainy dark weather, the forecasts will probably have to 
shake off a cool bias and mere 60s for highs seems a bit low. That 
said, the record daily high temps do fall off pretty quickly in the 
middle of October... highs above 70 would crack a couple daily 
records at Sea-Tac--the 16th and 18th for example.

&&

.AVIATION...Moderate northerly flow aloft will prevail through most 
of Thursday due to an upper level ridge over the area. The air mass 
will remain stable, with drying taking place. Overnight and morning 
fog will again be possible on Thu AM due to boundary layer moisture 
and clear skies above. Fog will be shallow on Thu AM, so burnoff is 
expected over the course of mid-late morning.

KSEA...Clear skies and light northerly wind are expected through 
this evening. Fog re-development appears likely during the overnight 
hours and into the early morning. This fog is expected to be 
shallow, so burnoff is expected in the 16z-18z time frame. Clear 
skies will prevail Thu aftn, other than high cirrus. Winds will 
be northerly at speeds of 4-8 knots. SMR/Haner

&&

.MARINE...Light northerly offshore flow will prevail through
Thursday morning, becoming northerly onshore late Thursday through 
Friday. Brief small craft strength westerly may be possible through 
the Strait on Fri morning. 

Stronger northerly offshore flow will develop Friday night and 
Saturday morning, with small craft strength northeasterlies possible 
from the islands out through the Strait. Light to moderate offshore 
flow will continue into early next week. Otherwise, areas of fog 
will be possible each morning through at least Saturday. SMR/Haner

&&

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

$$

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