Marine Interpretation Message
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000
AGPN40 KWNM 300908
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
208 AM PDT Thu Mar 30 2017

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

The ASCAT pass from 06Z shows NW winds 15-25 kt across the entire
offshore waters. An altimeter pass from 02Z indicates seas to 12
ft over the southern California waters. The overall forecast
pattern during the upcoming week will remain fairly stable as the
typical ridge/trough combination will be diving force across
much of the California waters. Further N...During the first
couple of days a cold front will move into the waters and weaken
as it encounters the ridge axis. The ridge will become even
stronger after the frontal passage and dominate the waters for
several days thereafter. Towards the end of the week another
cold front will push its way into the waters...increasing the
winds ahead of the cold front to 30 kt. The main focus will
remain across the California waters however as occasional gale
winds will occur...mainly across the inner offshore zones South
of Point Arena. The 00Z global models are in pretty good
agreement throughout the forecast period...with only some minor
differences. I will populate the wind grids using a 50/50 blend
of the 10M and 30M winds through 00Z Sunday...then transition to
the ECMWF from 03Z Sunday through 00Z Tuesday. I will also boost
the winds over the area during that time to compensate for the
weak bias of the ECMWF. Finally I will finish by populating the
remainder of the week with a similar GFS blend as the first part
of the forecast period.

seas...the seas were initialed OK across the offshore waters.
The ENP is a couple of feet lower than the WAM over portions of
the California waters during periods of the highest winds...this
seems reasonable. Will populate the wave grids using a 50/50
blend of the ENP/WAM through 00Z Sunday...then use the WAM from
03Z Sunday through 00Z Tuesday. I will finish the week off by
using the ENP.

Extratropical storm surge guidance...n/a.

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
.PZZ900...Outer Waters from Cape Flattery to Cape Shoalwater...
     Gale Possible Monday night.

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Possible Sunday into Sunday night.
.PZZ825...Inner Waters from Point Arena to Pigeon Point...
     Gale tonight into Friday night.
     Gale Possible Sunday into Monday.
.PZZ830...Inner Waters from Pigeon Point to Point Piedras Blancas...
     Gale tonight into Friday night.
     Gale Possible Sunday night into Monday.
.PZZ930...Outer Waters from Pigeon Point to Point Piedras Blancas...
     Gale Friday night.
.PZZ835...Inner Waters from Point Piedras Blancas to Santa Cruz Island, CA...
     Gale tonight.
.PZZ840...Inner Waters from Santa Cruz Island, CA to San Clemente Island, CA...
     Gale tonight.

$$

.Forecaster Shaw. Ocean Prediction Center.



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