Marine Interpretation Message
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000
AGPN40 KWNM 241955
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
1255 PM PDT Sat Jun 24 2017

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

Grids: 12z GFS 10m winds and 12z WW3 throughout, with only minor
modifications mentioned below. Models remain in excellent
agreement throughout the entire forecast period.

Metop-B overpass before 18z returned winds generally 15 kt or
less across a wide swath over the CA offshore waters, as high
pressure has nosed northward atop the region. Relatively weak
pressure gradients, light surface winds, and flat seas expected
for the remainder of the weekend into Monday. Higher winds to 25
kt possible across the far northern OR/WA waters Sun along the
east extent of high pressure, and in the waters immediately
adjacent to the Channel Islands (zone 840) in seasonal n to nw
flow.

Into the middle of next week, Tue through Thu night, typical
summer pattern returns as low pressure trough reforms and
intensifies along the CA coast, while high pressure builds
eastward over the Pacific. Combination will produce a large area
of strong n-lies in the waters adjacent to the N CA and SW OR
coasts. Afternoon guidance again suggests possible gales in the
gradient, but confined mostly to the coastal waters within 60 nm
of land. With little confidence in exact timing and coverage of
strongest winds, will continue to limit the extended range to 32
kt or less over OPC waters (sub gale criteria), and allow future
shifts and model runs to dictate if or when warning headlines
are needed.

Seas: no surprise that both the 12z WW3/WAM remain in excellent
agreement. Will base significant wave height grids on the WW3.

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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