Marine Interpretation Message
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900
AGPN40 KWNM 241414
MIMPAC

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

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

Weakening trend has continued this early morning over the Eastern
Pacific, and save for a small area in the vicinity of the Channel
Islands, will be hard pressed to find surface winds 25 kt or
greater at next forecast issuance. Weak gradients, light surface
winds, and flat seas the rule over the weekend as a weak surface
low moves farther west of the outer offshore waters, while weak
high pressure ridge noses northward across the CA waters.

Into the middle of next week, very typical pattern returns as
low pressure trough reforms and intensifies along the CA coast,
while high pressure builds eastward over the Pacific. Combination
will produce large area of prevailing strong n-lies in the
waters adjacent to the N CA and SW OR coasts. Overnight guidance
suggests possible gales in the gradient, 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 30 kt or less over OPC waters, and
allow future shifts and model runs to dictate if or when warning
headlines are needed.


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PREVIOUS DISCUSSION...

Altimeter passes from 03Z and 06Z indicate seas to 9 ft across
the offshore waters, with maximum waves over the northern and
central California area. The ASCAT pass from 06Z continues to
show a weakening pressure gradient across the Oregon and northern
California waters, with maximum winds to 25 kt. A weak low
center has formed West of the California waters near 33N 132W.
The 00Z global models continue to be in amazing agreement during
the upcoming week. The overall pattern will become weak as the NE
gradient continues its weakening trend, while a high pressure
ridge across the NW PZ5 waters weakens as well. The low center
west of the California waters will gradually weaken over the next
several days. Once that occurs a NW flow will take hold across
the entire region as strong high pressure begins to build W of
the area. Late in the week the winds along the California coast
will intensify to 30 kt, with 35 kt possible in the coastal zones
as the California trough begins to strengthen. I will populate
the wind grids using the 10M GFS throughout the period.

Seas...both the ENP and WAM are in good agreement for the next 7
days and were initialized well. I will populate the wave grids
using the ENP throughout the forecast period.

Extratropical Storm Surge Guidance: n/a.


.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
     None.

$$

.Forecaster Collins/Shaw. Ocean Prediction Center.



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