Grays River, Washington

... Coastal Flood Advisory in effect from 4 am Monday to noon PST
Tuesday for minor tidal overflow along low lying sections of the
South Washington coast...
... High surf advisory in effect from 4 PM Monday to 10 am PST
Tuesday for the South Washington coast...

The National Weather Service in Portland has issued a coastal
Flood Advisory... which is in effect from 4 am Monday to noon PST
Tuesday. A high surf advisory has also been issued. This high
surf advisory is in effect from 4 PM Monday to 10 am PST Tuesday.

A strong Pacific system will generate large seas and high winds
Monday and Tuesday over the region. With tides approaching their
monthly maximum over the period when the storm surge arrives some
minor tidal overflow may occur... especially around the city of
Raymond where similar circumstances caused minor flooding in
January of 2004. The published tide is expected to peak at 10.4 feet
on Monday at noon... at 8.1 feet on Tuesday at 2 am which is when
most of the storm surge arrives... and at 10.1 feet at 1 PM on
Tuesday at Toke Point Washington. Luckily most of the storm surge
arrives during the weakest of the three highest tides. Tidal
anomalies are running around a half a foot. This storm will bring
two surges with the weaker of the two occurring Monday morning
followed by a stronger surge on Tuesday morning.

During the storm... seas will climb to 23 to 27 feet with periods
around 11 seconds. These large seas will make for dangerous beach
conditions with waves pummeling the surf zone which will only be
exacerbated by the prominence of the enhanced lunar tidal cycle.
Due to the magnitude of the high tides waves will travel much
further up the beach than usual creating a dangerous situation in
which extreme caution must be exercised. Large logs and other
debris can easily be tossed around by the force of these
waves... even the largest logs can roll easily on gently sloped
beaches in ankle deep water.

Precautionary/preparedness actions...

A coastal Flood Advisory indicates that onshore winds and tides
will combine to generate flooding of low areas along the shore.

A high surf advisory means that high surf will affect beaches in
the advisory area... producing rip currents and localized beach
erosion.

... High Wind Warning in effect from midnight tonight to 10 am PST
Tuesday for the South Washington and north Oregon coast...

The National Weather Service in Portland has issued a High Wind
Warning... which is in effect from midnight tonight to 10 am PST
Tuesday morning. The high wind watch is no longer in effect.

Disturbances moving along a nearly stalled frontal boundary
offshore will allow south winds to pick up at times tonight and
Monday. The first round of stronger winds will arrive later
tonight... with another round expected early Monday afternoon.

Later this evening... south winds will strengthen to 25 to 40
mph... with 35 to 45 mph on the open beaches and headlands. Winds
gusts of 50 to 60 mph are expected tonight and Monday... with gusts
of 65 to 80 mph on the open beaches and headlands.

The strongest winds will strike the north Oregon and South
Washington coast Monday night. A very deep low pressure system
will develop offshore late Monday... and pass offshore of the north
Oregon coast Monday evening as it moves towards British Columbia.
The associated cold front will move onshore late Monday night.
Expect south winds to increase again Monday evening... with
sustained south winds of 40 to 50 mph... and gusts of 65 to 80
mph. However... on the open beaches and headlands... sustained winds
of 50 to 60 mph with gusts of 85 to 95 mph are likely.

Winds will ease early Tuesday morning as the low pressure moves
further away from the region.

Precautionary/preparedness actions...

A High Wind Warning means a hazardous high wind event is expected
or occurring. Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.