Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Seattle Washington
300 am PDT Sat Jul 4 2015
Synopsis...unseasonably warm weather will continue through the
middle of next week. Cooler weather will arrive late next week as an
upper trough reach the area and onshore flow increases.
Short term...well above normal temperatures will continue through
Monday. Low level onshore flow is a bit stronger early this morning.
This might lead to a couple degrees of cooling today but highs will
still be near 90 for parts of the interior. Low clouds will probably
get close to the south sound early this morning before burning off.
Low level offshore flow will develop Sunday which will allow highs
to warm a few more degrees. Highs will be in the middle 80s to middle 90s
for most of the area. Even the coast will be toasty with offshore
flow. A heat advisory is in effect through Sunday evening for inland
areas Seattle southward.
Weak onshore flow will return Monday. Highs will cool 10-15 degrees
at the coast and there will likely be some morning low clouds again.
Inland areas will only see a few degrees of cooling. Schneider
Long term...well above normal temperatures will continue through at
least Wednesday. Upper heights will remain high and low level
onshore flow will be weak. The models show upper heights briefly
rising across the area on Wednesday and the low levels warming a
It looks like there will finally be a distinct cooling trend
Thursday and Friday although models differ on which day the
significant cooling will commence. There could also be some showers
coming up from the south by the end of the week although the models
are not getting to excited about this just yet. Schneider
Aviation...western Washington will remain between an upper level high
offshore and an upper trough over central Canada. This will keep the
flow aloft from the northwest. The low level flow will be northerly. Areas of
LIFR ceilings/visibilities over the coast are anticipated to dissipate by 2000
Ksea...VFR. Light and variable winds will become northerly 5-10 knots by 1900
Marine...high pressure will build over British Columbia today. This
combined with lower pressure over Oregon will result in the flow
becoming northerly. Offshore flow will develop tonight and continue
into Sunday due to an area of low pressure setting up off the Washington
Washington...heat advisory for Seattle...Bellevue...Tacoma...and east Puget Sound
sound lowlands zones.
Pz...Small Craft Advisory outer coastal waters.