549
FXUS66 KSEW 160317
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
817 PM PDT Sun Jul 15 2018
.SYNOPSIS...Much above normal temperatures continue into Monday.
Cooler low level onshore flow will develop Tuesday and increase
Wednesday for several days with more normal temperatures.
&&
.SHORT TERM...Sea-Tac set a new daily record today, topping out at
93 degrees. The previous record was 92 back in 1958. This was the
first 90+ at Sea-Tac this season (the average start date is July
3rd). The office here in North Seattle hit 89 which is also a new
record. Other climate sites were a few degrees behind. The cool
spots were along the coast with onshore flow. Places like Ocean
Shores and Copalis Beach stayed in the 60s today. Low clouds will
likely form along the coast overnight otherwise skies will remain
mostly clear in the interior. Expect lows in the 50s to lower 60s.
33
Previous discussion...Monday will be another hot day--except
along the coast, where the sea breezes will become stronger each
day from here on out. Low level onshore flow will increase Tuesday
and Wednesday as the marine layer deepens, and, with cooling
aloft, we will get our fever back down to normal for several days.
Marine layer clouds will increase at some point along the coast--
probably just a few patches late tonight and Monday morning, but
then for Tuesday and Wednesday mornings there should be night and
morning low clouds and fog banks on the coast--with fog and low
clouds squirting into the Strait of Juan de Fuca too. Awfully
clear out there today though--the fog and low clouds that were
partway up the Oregon coast earlier today burned off, so we will
see what happens along the coast overnight tonight, best rest
assured, the natural AC will kick in pretty soon.
.LONG TERM...Previous discussion...The cool down back near
average temps midweek will give Western Washington near average
temps Wed- Friday, and then temps are likely to turn a bit warmer
again for next weekend. Areas of night and morning clouds, mainly
on the coast, should break up and diminish around the end of the
week. The trough moving through B.C. Thursday and Friday should
not give our area any precip-- about the best we can hope for are
a few misty mornings on the coast and some dew at daybreak for the
interior.
&&
.AVIATION...The air mass across Western WA will remain dry and
stable through Monday. The flow aloft is westerly. The coast may
see patchy low clouds or stratus during the morning. Otherwise,
VFR conditions expected in the interior. 33
KSEA...VFR conditions will prevail. N/NE winds at the surface
5-10 kt. 33
&&
.MARINE...High pressure over the NE Pacific will maintain
onshore flow across the region through Monday. Highest winds are
over the coastal waters where Small Craft Advisory winds are
likely. Onshore flow will increase on Tuesday. Gales are possible
through the Strait of Juan de Fuca on Wednesday with a stronger
onshore push. 33
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 5 PM PDT Monday for Coastal Waters
From Cape Flattery To James Island 10 To 60 Nm-Coastal
Waters From James Island To Point Grenville 10 To 60 Nm-
Coastal Waters From Point Grenville To Cape Shoalwater 10
To 60 Nm.
Small Craft Advisory until 5 AM PDT Monday for Coastal Waters
From James Island To Point Grenville Out 10 Nm-Coastal
Waters From Point Grenville To Cape Shoalwater Out 10 Nm.
&&
$$
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