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National Weather Service Area Forecast Discussion for Seaside, OR USA

fxus66 kpqr 231654

Area Forecast Discussion
National Weather Service Portland, OR or
937 am pdt wed aug 23 2017

.synopsis...a weak storm system will bring cooler temperatures and a
chance for some very light rain late tonight and thursday. high
pressure aloft quickly rebuilds across the pacific northwest
saturday, for a return of very warm temperatures by the end of the
weekend. hot conditions will remain through the first portion of next


.short term...tonight through saturday...fog and low stratus remains
along the coast and in much of the northern half of the willamette
valley this morning. meanwhile, latest satellite and radar products
reveal ongoing showers near and just east of the cascade crest
rotating around an upper level disturbance over north-central
california. some of these showers may rotate just west of the crest
today and impact the communities near the upper foothill elevations
or in the cascades, but generally should be brief and only south of
about mt. hood.

a shortwave trough sliding eastward into canada today will drag a
front currently offshore into the region tonight. this should spread
even more clouds inland overnight and result temperatures cooling
further on thursday. in addition, some light rain certainly appears
possible late tonight and thursday morning, particularly along the
coast and cascade foothills.

shortwave ridging slowly pushing eastward into the pacific northwest
should warm temperatures closer to average for the date on friday
before temperatures rise into at least the mid-upper 80s on saturday
in the willamette valley. cullen/neuman

.long term...saturday night through wednesday...shortwave ridging
over the pacific northwest will bring hot weather back to the
region. several days of 90f+ temperatures appear likely for the
willamette valley...with sunday and monday appearing the hottest.
this upcoming hot stretch will likely produce a multi-day period of
critical fire weather conditions as well. east to northeasterly
winds should allow smoke to filter back into the region sunday and
monday. the flow aloft may turn southerly enough early next week
that there is an outside chance of elevated thunderstorms developing
at some point, but for now, models suggest it won`t happen so have
kept pops below mentionable thresholds for now. /neuman


.aviation...marine stratus is currently bringing a mix of flight
conditions to the forecast area this morning with ifr/lifr to
mvfr at the coast and mvfr to vfr in the interior. expect stratus
in the interior to scatter out by 18z, with vfr through late
tonight. the coast will likely remain below mvfr, but could see a
brief improvement to vfr this afternoon. a weak front will move
across the forecast area late tonight/early thu and bring reduced
cigs along with some light rain/drizzle.

kpdx and approaches...expect mvfr stratus to scatter out by 18z,
with vfr conditions through tonight. a weak front will impact the
terminal late tonight/early thu and bring a period of mvfr cigs
and possibly some light rain/drizzle. /64


.marine...benign marine weather conditions persist with winds
less than 10 knots and seas less than 4 feet. a weak cold front
will move across our waters late wednesday into wednesday night.
post frontal northerly winds on thursday morning may approach
small craft advisory strength, but given the short duration of
strongest winds and borderline 21-22 kt gusts expected, elected
not to issue any products. otherwise, winds will remain less than
20 kt until friday afternoon into the weekend when the thermal
trough builds north and strengthens northerlies across southern
waters. a small craft advisory will likely be needed during this
timeframe. without any storms to generate a swell, seas will
remain small through the weekend and into next week. /bentley


.pqr watches/warnings/advisories...



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this discussion is for northwest oregon and southwest washington
from the cascade crest to 60 nautical miles offshore. this area is
commonly referred to as the forecast area.

Information courtesy of the National Weather Service - NWS Portland...
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