Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 012130
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
230 PM PDT Sat Oct 1 2022

.SYNOPSIS...An upper ridge and a warm, dry air mass will remain
over the region through next week. Areas of night and morning fog
and low clouds will occur mainly Tuesday through Thursday.


&&

.SHORT TERM /TONIGHT THROUGH TUESDAY/...There was a pretty decent
northerly breeze today and thermally induced low pressure is along
the Oregon coast. The OTH-SEA gradient is -7mb this afternoon but
that will gradually come down over the next two days. An upper ridge
will keep the warm, dry air over the region. It will be a little
hazy, and a few hours of fog in a few of the river valleys each
morning is a good bet. Highs will remain well above normal but as
the offshore flow becomes pretty flat shallow marine air will
develop with highs cooling a bit on Tuesday. Coastal fog and low
clouds will increase by Tuesday morning, and patchy fog over the
inland waters should become more widespread by Tuesday but still
remain shallow. 19

.LONG TERM /WEDNESDAY THROUGH SATURDAY/...The upper ridge fades
with temps falling off a little. The upper ridge shifts inland,
weakens, but then rebuilds to the west again. So, late night and
morning fog will increase for a day or two before light offshore
flow resumes late in the week. It looks like the ridge will give
way to rainy weather around ten days from now. 19

&&

.AVIATION...VFR conditions with mostly clear skies with some haze
will continue through the rest of today. Haze from the smoke
moving in is not expected to be at high enough concentrations to
reduce visibility or create a ceiling. Offshore winds 7-10 knots
through the evening and easing during the overnight. Shallow
patchy fog likely during the morning hours Sunday.

KSEA...Northerly winds 8-12 knots throughout the rest of the day,
easing during the overnight. Shallow patchy fog possible after 12
UTC Sunday.

Butwin

&&

.MARINE...Breezy northerly winds over much of the area as a
thermal trough builds over the area. Winds will be strongest
during the afternoon/evening hours, but are all expected to remain
below headline criteria.

Northwesterly swells 3-5 feet will continue into next week.

Butwin



&&

.HYDROLOGY...The daily hydrology discussion has ended until the
start of the next rainy season; it will only be updated as needed.

&&

.FIRE WEATHER...Warm, dry weather will continue. As the northerly
gradients ease over the next two days, shallow marine air will
increase--along the coast at first, and then spreading somewhat
into the interior lowlands Tuesday morning. The mountains should
not see much increase in humidity--in fact, relative humidity
will probably be a bit drier Sunday and Monday than it was today,
but winds will not do much so fire weather conditions will be
pretty benign. 19


&&

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

&&

$$


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