Marine Interpretation Message
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000
AGPN40 KWNM 170926
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
226 AM PDT Thu Aug 17 2017

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

Gale warnings will be retained in the PZZ815 zone in the
extended period because a low pressure trough along the
California coast will force a tight pressure gradient as high
pressure builds in from the west. Satellite images show clouds
with brighter tops over the central waters and indicate clearing
over the other areas. latest observations show highest winds in
the gale force range over the far eastern portion of the central
waters. At 06Z the NCEP weather map has high pressure 1028 mb
west of the region near 40N143W with its northeast ridge into the
north waters and southeast ridge passing the western portion of
the southern waters. Inland low pressure 1006 mb over
Arizona/california border has trough extending northwest into the
central waters with pressure gradient just tight over the
central waters that has resulted in gale force winds. Models are
in good agreement on keeping the low pressure inland but weaken
the high pressure to the west and that will relax the pressure
gradient and so will keep warnings over the central waters. High
pressure will weaken slightly though the inland trough will
persist, the gradient will briefly relax then strengthen in the
extended period. Will continue with GFS.

.SEAS...Seas range between 4 and 9 ft with peak at 11 ft over the
central waters. NWW3 and ECMWFWAVE models fit well the observed
06Z seas chart. Boh wave models are still in good greement and so
will just stay with NWW3.

.EXTRATROPICAL STORM SURGE GUIDANCE...n/a.

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Friday night.
     Gale Possible Saturday night into Sunday night.

$$

.Forecaster Musonda. Ocean Prediction Center.


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