083
FXUS66 KSEW 162134
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
234 PM PDT Fri Apr 16 2021

.SYNOPSIS...Dry and warm conditions continue across the region
into the weekend as upper level high pressure remains in place.
Slight cooling arrives at the coast Sunday with a return of cooler
onshore flow. Dry and mild weather will follow through mid week.

&&

.SHORT TERM /TONIGHT THROUGH MONDAY/...Warm and dry weather will
continue through the weekend with high pressure over the region.
Temperatures are mostly in the 70s this afternoon with a few low
80s as well. Temperatures will peak on Saturday and will be a few
degrees warmer compared to what we are seeing today. Temperatures
will then nudge downwards a few degrees on Sunday (although still
remain above average) as the thermal trough weakens and the flow
flips onshore. The interior will still see highs in the 70s but
cooler NW flow will keep the coast in the 60s. The flow turns
offshore again on Monday while a frontal systems slides south
through eastern WA. This will bring breezy NE/E winds to western
Whatcom county and the Cascade gaps. Expect highs in the 60s along
the coast with lower 70s inland.

Fire Weather concerns remain elevated through the weekend due to
warm and dry conditions (and low humidity). Finer fuels, like
100-hour fuels, are seeing record dryness for the season under
these current conditions. The fire danger is lower in the
mountains where the snowpack remains healthy. 33

.LONG TERM /TUESDAY THROUGH FRIDAY/...Western WA remains under
weak high pressure through mid week for more dry and mild weather.
Rain chances increase toward the end of the week as low spins off
the coast. This may bring the first shot of widespread measurable
rain in the past 2 weeks (since April 10th). 33

&&

.AVIATION...East-northeasterly flow with an upper ridge across the
area. VFR through the period. Light offshore flow continues with
north to northeasterly winds through tonight, light winds
Saturday.

KSEA...VFR through the period. Surface winds light northeasterly 5
to 10 kts through this evening, light into Saturday morning.

JD

&&

.MARINE...Light winds across the waters into the weekend with high
pressure across the area. Winds will increase Sunday night into
Monday with offshore flow as a front slides east of the area, though
mainly under Small Craft Advisory criteria. Winds will be light late
Monday into Tuesday with lighter onshore flow.

JD

&&

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

&&

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

$$

www.weather.gov/seattle

NWS SEW Office Area Forecast Discussion