Marine Weather for HS 102


marine weather discussion for N Pacific Ocean NWS ocean prediction center Washington DC 139 PM PDT Wed Jun 28 2017

.Forecast discussion...Major features/winds/seas/significant .Weather for the North Pacific N of 30n and E of 150w.

Afternoon grids: 12z GFS 10m winds throughout, capped at 32 kt. For seas, will use the 12z ww3 enp, capped at 11 ft. Brief discussion follows.

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 persistent bias within the global guidance, so will continue 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.

Seas: no issues using the ww3 with the GFS as the basis for wind grids. Will cap Max sea heights to 11 feet throughout.

Extratropical storm surge guidance: N/A.


.Pz5 Washington/Oregon waters... None.

.Pz6 California waters... None.


.Forecaster Collins. Ocean prediction center.

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