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000
AGPN40 KWNM 282039
MIMPAC

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.

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
     None.

$$

.Forecaster Collins. Ocean Prediction Center.



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