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AGPN40 KWNM 281438

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
738 AM PDT Wed Jun 28 2017

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

Overall little to no changes will be needed to the ongoing
forecast in place, save for minor edits to better match coastal
forecast offices.

Fairly straightforward, very typical summer pattern forecast for
the next several days across the Eastern Pacific. Interaction
between low pressure trough along the CA coast with E Pacific
high pressure will produce a widespread area of strong breeze to
near gales (20-30 kt winds) in the waters adjacent to the coast,
from the Channel Islands north to near Cape Blanco. As the models
are wont to do, gradients tighten towards the end of the period
signaling possible gales over the coastal areas late in the
weekend -- but this is a known bias within the global guidance,
so will continue (with confidence) to trim back forecast winds
in the medium to long range portion of the forecast, certainly to
ensure gale winds do not reach the OPC area of responsibility.


The 00Z model agreement continues to be good throughout the
forecast period. Will use the 10m GFS with some edits throughout
to adjust for minor differences in model solutions. Very little
will change with this forecast as models have been consistent
from run to run.

High pressure building to the west and a strong coastal trough
will continue to be the greatest impact of the forecast period.
Not expecting to see gales in the offshore waters; however, gales
are possible in the coastal areas late in the forecast.

Tropical Storm Dora remains to the south of the forecast waters
near 19.8N 113.1W at 09Z. It is expected to move west-northwest
while weakening. It will have no significant impact on the
offshore waters.

.SEAS...Wavewatch initialized only slightly better than the WAM
so will use the Wavewatch. Will need to decrease the seas late in
the period as the Wavewatch appears to be too high. Will edit
those grids toward the ECMWF WAM.



.PZ5 Washington/Oregon Waters...

.PZ6 California Waters...


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