946 
FXUS66 KSEW 111012
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
312 AM PDT Thu Oct 11 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...An upper ridge will remain just offshore through 
Saturday for mostly clear skies and dry weather. An upper short 
wave will dampen the ridge tonight and Friday as it passes to the 
north. The main impact will be will be to turn the low level flow 
a bit more onshore. Low level flow will turn more offshore again 
on Saturday. Areas of fog are likely night and morning hours each 
day. Highs will be near normal. Schneider

.LONG TERM...A strong upper ridge over the Eastern Pacific will
move over Western Washington early next week for a dry spell
Sunday through Wednesday. Low level offshore will also continue 
through the period. This pattern should continue to be conducive 
to some night and morning fog, especially in fog prone valleys. 
Aside from some morning fog, days should be mostly sunny and highs
will be near normal or maybe even a little above normal. 
Schneider

&&

.AVIATION...Northerly flow aloft will continue through the majority 
of Thursday due to an upper level ridge over the region. Flow aloft 
will shift more northwesterly Thursday night as a trough approaches 
from the north. VFR cigs currently exists across most of W WA. 
Exceptions exist where fog has developed along the southwest 
interior and Snohomish River Valley. Areas of fog/LIFR conditions 
will become more widespread 11z-14z due to boundary layer moisture 
and clear skies. Expect the fog to burnoff by 18z. Mainly clear 
skies expected this afternoon after lingering fog clears. Surface 
winds will remain light.

Fog may re-develop tonight into Friday morning as skies will remain 
mainly clear with light surface winds.

KSEA...Above discussion applies. Current VFR cigs are expected to 
erode to LIFR conditions this morning with fog developing around 14z 
and continuing through 18z before burning off. Cigs below 200 feet 
and visibility below 1 mile with the fog. A light northerly surface 
wind is expected through today. Mainly clear skies will prevail this 
afternoon with some high cirrus. JD

&&

.MARINE...Light offshore flow this morning will turn onshore this 
evening and remain that way through Friday. While models have backed 
away from the prospect of small craft advisory speed winds in the 
strait Friday morning...previous solutions did advertise such 
speeds...so while not in the morning forecast...it will be something 
for future shifts to monitor. 

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

&&

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

&&

$$

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