Marine Interpretation Message
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000
AGPN40 KWNM 210332
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
832 PM PDT Fri Oct 20 2017

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

Very few changes will be made to the forecast as the models
remain fairly consistent and continue with fairly good agreement.
Residual west to northwest swell is running 1 to 2 ft higher than
the closest models which is the Wavewatch III, the model used in
the existing wave grids. For the evening update will bump the
seas up by about 10 percent for the first period based on
observations and altimeter data, but will gradually have them
subside through 00Z Sun.

-----------------------------------------------------------------
PREVIOUS DISCUSSION...

12Z model agreement appears to be good for the bulk of the
forecast with only a few differences later in the period. This is
mainly in regards to the timing of a cold front approaching the
northern waters on Tues night. Will continue the use of the 10m
GFS as the basis for the forecast; however, will need to edit a
bit in order to create more representative grids.

Will continue gales with a frontal passage tonight through Sunday
in the northern waters. Will also keep a mention of thunder with
these fronts.

.SEAS...Wavewatch appears to be handling the large swell that is
finally beginning to subside a bit better than the WAM, keeping
the seas a bit higher. The wave model solutions come into better
agreement by 06Z tonight. Will use the Wavewatch throughout with
some edits.

.EXTRATROPICAL STORM SURGE GUIDANCE...n/a

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
.PZZ800...Inner Waters from Cape Flattery to Cape Shoalwater...
     Gale Possible Tuesday night into Wednesday night.
.PZZ900...Outer Waters from Cape Flattery to Cape Shoalwater...
     Gale Possible Wednesday night.
.PZZ805...Inner Waters from Cape Shoalwater to Cape Lookout...
     Gale tonight into Saturday night.
.PZZ905...Outer Waters from Cape Shoalwater to Cape Lookout...
     Gale tonight into Saturday night.
.PZZ810...Inner Waters from Cape Lookout to Florence OR...
     Gale tonight.
     Gale Saturday night.
.PZZ910...Outer Waters from Cape Lookout to Florence OR...
     Gale Saturday into Saturday night.
.PZZ815...Inner Waters from Florence OR to Point St. George...
     Gale tonight.
     Gale Possible Wednesday night.
.PZZ915...Outer Waters from Florence OR to Point St. George...
     Gale tonight into Saturday.

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Possible Wednesday night.
.PZZ825...Inner Waters from Point Arena to Pigeon Point...
     Gale Possible Wednesday night.
.PZZ840...Inner Waters from Santa Cruz Island, CA to San Clemente Island, CA...
     Gale tonight.

$$

.Forecaster Bancroft/Sommerville. Ocean Prediction Center.



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