Marine Interpretation Message
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000
AGPN40 KWNM 152121
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
121 PM PST Fri Dec 15 2017

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

An ASCAT pass from 1742Z had a swath across sections of the CA
waters. Where data was availble winds were to 20 kt over the
central and nrn waters.

Early this afternoon a cold front was moving into central CA
waters while strong high pres was W of the OR/nrn CA waters.
Gales should develop over the inner waters of the nrn and central CA
waters by early tonight. Model guidance begins to weaken the
strong high pres late Sat morning into the afternoon. Will have
winds increasing to 40 kt over the inner waters of the central CA
waters by early morning Sat. As the high pres continues to
weaken to the W of the nrn CA waters Sat night into Sun the
coastal trof persists while winds gradually diminish later on
Sun. By Mon a fairly strong upper shortwave approaches the waters
from the Gulf of AK. The surface low pres that develops as a
result is stronger with the GFS and UKMET compared to the
GEM/ECMWF. Preference is for the stronger solution and will favor
the GFS/UKMET with this with its stronger high pres that builds
in from the NW through Wed night.

Seas...The WWIII ENP and ECMWF wam look similar through about 12Z
Tue. The ECMWF wam is several feet higher than the WWIII with
seas along inner waters of the central CA waters Sat and will use
a 40/60 blend of these models to account for this difference. By
Tue will use the WWIII ENP which is higher than the ECMWF wam
guidance as the strong upper level forcing moves E across the
waters Tue and Tue night.

.EXTRATROPICAL STORM SURGE GUIDANCE...N/A


.WARNINGS...Preliminary.

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

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Saturday into Saturday night.
.PZZ825...Inner Waters from Point Arena to Pigeon Point...
     Gale tonight into Saturday night.
.PZZ830...Inner Waters from Pigeon Point to Point Piedras Blancas...
     Gale tonight into Saturday night.
.PZZ930...Outer Waters from Pigeon Point to Point Piedras Blancas...
     Gale Saturday into Saturday night.
.PZZ835...Inner Waters from Point Piedras Blancas to Santa Cruz Island, CA...
     Gale Saturday into Saturday night.
.PZZ935...Outer Waters from Point Piedras Blancas to Santa Cruz Island, CA...
     Gale Saturday night.

$$

.Forecaster Rowland. Ocean Prediction Center.



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