Marine Interpretation Message
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AGPN40 KWNM 232000

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
100 PM PDT Mon Oct 23 2017

.FORECAST DISCUSSION...Major features/winds/seas/significant
.weather for the North Pacific N of 30N and E of 150W.

The 18z surface analysis indicated a high pressure ridge over the
Washington, Oregon and northern California waters with a trough
extending along the California coast. An ascat pass from around
1740z with limited coverage mainly over the central and southern
California waters indicated a small area of 30 kt over the
northern California coastal waters. Otherwise, winds were mostly
in the 15 to 25 kt range which matches up well with model
forecast fields.

The 12z models continue to be in very good agreement through the
forecast period. During the short term period tonight through
Thursday night, the models all continue to indicate the ridge
over the Washington and Oregon waters builds west while the
trough along the California coast expands north along the Oregon
and Washington coast through Tuesday night. A weak cold front
will move across the Washington and Oregon waters Wednesday
before dissipating Wednesday night. Winds with this front will
remain well below gale with this front. Weak low pressure will
then move over the Oregon coastal and offshore waters Thursday
and Thursday night then move into the Washington waters and
eventually dissipate Friday. Then looking ahead to Friday night
and beyond there are some differences with placement of lows,
however these are west of the offshore waters and in general the
models agree on a weak high pressure ridge across the waters.
There seems to be better agreement between the 12z GFS/UKMET/CMC,
so will use the GFS 10m winds through the period.

.SEAS...The 18z sea state analysis indicated that observed seas
were within a foot of the WaveWatch III forecast values, and plan
on using the WaveWatch values through 12z Friday. For Friday
through Saturday night, the WaveWatch values look a bit high, so
will use a blend of the WaveWatch and ECMWF WAM during that



.PZ5 Washington/Oregon Waters...

.PZ6 California Waters...


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