Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 251529
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
829 AM PDT Sun Oct 25 2020

.UPDATE...A rather chilly morning across Western Washington with
temperatures in the upper 20s to mid 30s. Temperatures in the mid
40s to low 50s in spots by this afternoon. Dry weather into early
this week with an upper ridge offshore of the area.

&&

.SYNOPSIS...Dry weather with chilly temperatures will continue
into Monday and then temperatures will gradually moderate through
the week. A front will reach the area later this week.

&&

.SHORT TERM /TODAY THROUGH TUESDAY/...Cool and crisp today. High
pressure and offshore flow is giving us cool and dry conditions
across western WA. Temperatures in the interior are mainly in the
30s this morning with dew points in the 20s - the coldest
conditions we`ve seen so far this season. The Frost Advisory
remains in effect this morning with areas near or below freezing.
Up north, winds have been gusty in the North Interior but will
gradually ease. Otherwise, sunny skies this afternoon with
temperatures mostly reaching the 40s.

Dry northerly flow will continue into Monday. Lows continue to
trend below normal with temperatures near freezing. Although,
it`ll be a few degrees warmer (compared to today) thanks to
increasing mid and high clouds. Highs will be near 50 degrees.

A ridge over the West will flatten over WA next Tuesday as a warm
front clips southern B.C. This system may clip western WA for a
period of light rain (mainly bear the Canadian border). Temperatures
will moderate and trend closer to normal. 33

.LONG TERM /WEDNESDAY THROUGH SATURDAY/...The ridge rebuilds over
the Pac NW on Wednesday while a trough digs offshore. The flow
then turns more zonal thereafter as weak disturbances tracks
through the region. The coast and mountains will see a return of
rain with generally light precipitation in the interior. The
offshore trough, mentioned above, may eventually shift inland late
in the week. 33

&&

.AVIATION...VFR conditions under generally clear skies over the
lowlands today. A more prominent mid-level cloud deck also persists
over the Cascades and into the adjacent hills through mid morning.
These clouds should continue to gradually scatter with a dry
northerly flow aloft. Northern terminals will stay breezy through
the morning with residual Fraser outflow winds and some areas
downwind of gaps in the terrain will maintain localized east gusts
today. Otherwise, gradually easing winds today, with surface winds
generally from the north/northeast.

KSEA...KSEA...VFR conditions continue under mostly clear skies and
breezy north/northeasterly surface winds.

Cullen/Kristell

&&

.MARINE...Breezy northeast Fraser outflow winds continue this
morning, but will gradually ease toward mid-day. As a result, the
current Small Craft Advisories for the Strait of Juan de Fuca and
northern inland waters have been extended through 11 AM.  East winds
through the lower Chehalis and Grays Harbor also continue to surface
over the coastal waters, so will also maintain the advisory for the
southern zones of the coastal waters through the morning. Seas will
continue to subside over the coastal waters today, generally
remaining in the 5-7 ft range through around Tuesday. Expect
generally light winds over the coastal waters Monday, with a return
of southerly winds possible toward midweek as a weak front may
approach.

Cullen/Kristell

&&

.HYDROLOGY...Flooding is not expected through the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 10 AM PDT this morning for Admiralty Inlet
     Area-Bellevue and Vicinity-Bremerton and Vicinity-East
     Puget Sound Lowlands-Eastern Strait of Juan de Fuca-Everett
     and Vicinity-Hood Canal Area-Lower Chehalis Valley Area-San
     Juan County-Seattle and Vicinity-Southwest Interior-Tacoma
     Area-Western Skagit County-Western Strait of Juan De Fuca-
     Western Whatcom County.

PZ...Small Craft Advisory until 11 AM PDT this morning for Central
     U.S. Waters Strait Of Juan De Fuca-Coastal Waters From Cape
     Flattery To James Island 10 To 60 Nm-Coastal Waters From
     Cape Flattery To James Island Out 10 Nm-Coastal Waters From
     James Island To Point Grenville 10 To 60 Nm-Coastal Waters
     From James Island To Point Grenville Out 10 Nm-Coastal
     Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater Out
     10 Nm-East Entrance U.S. Waters Strait Of Juan De Fuca-
     Northern Inland Waters Including The San Juan Islands-West
     Entrance U.S. Waters Strait Of Juan De Fuca.

&&

$$

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