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AGPN40 KWNM 272127

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
227 PM PDT Tue Jun 27 2017

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

Hurricane Dora still remains south of the waters in the vicinity
of 20N110W. See the National Hurricane Center Advisory for more
information on Dora. Gale warnings in the short term are just
north of the forecast region while those in the extended period
are just east of the central region with 30 kt winds expanding
into the far eastern portion of the central waters. The satellite
images still show clouds with mostly warm tops across most of
the region with relatively dry airmass over the far southern
waters. The latest observations also show 25 kt maximum winds in
a few areas. The 18Z NCEP map still has high pressure 1030 MB to
the west of Oregon waters along 140W. Inland low pressure 1006 MB
over southern California extends a trough northwest near the
coast into north California.

The models GFS/CMC/ECMWFHR/UKMETHR are still in good agreement
on the initialization of the high pressure and low pressure
mentioned above. Models continue to be in good agreement in the
short term on maintaining the high pressure to the west of the
region and weakening of the trough over California. Will
therefore continue with GFS like the previous forecast. In the
short term high pressure will remain anchored to the west of the
region and that will block any synoptic low pressure systems
form reaching the waters from the west through most of the
forecast period. Inland trough will strengthen toward the end of
forecast period and that will tighten the pressure gradient over
the eastern portion of the central region.

.SEAS...Relatively Larger seas are over the north waters with a
peak at 8 ft. Seas range between 3 and 5 ft elsewhere. NWW3 and
ECMWFWAVE continue to fit fairly well the observed seas pattern
and in addition both models are still in good agreement in the
short term. Will continue with NWW3 for seas in the grids. Seas
will build to peak at 12 ft over the far eastern portion of the
central region Saturday.



.PZ5 Washington/Oregon Waters...

.PZ6 California Waters...


.Forecaster Musonda. Ocean Prediction Center. is the U.S. government's official web portal to all federal, state and local government web resources and services.