Marine Interpretation Message
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000
AGPN40 KWNM 290300
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
800 PM PDT Tue Mar 28 2017

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

At this time I dont plan on making andy changes to the current
grids or associated text forecast. An altimeter pass from 20Z
shows seas to 16 ft across the eastern portion of the California
waters. It appears that gales are possible in the coastal waters
along the Oregon coast tonight as an approaching cold front
pinches the coast.
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PREVIOUS DISCUSSION...

Due to a system upgrade, the next offshore and high seas text
forecasts will be issued by the National Weather Service Forecast
Office in Honolulu, Hawaii.

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PREVIOUS DISCUSSION...

The ASCAT pass from 05Z indicates an area of gale winds across
the inner offshore waters off the southern California coast. The
gradient will weaken this morning to below gale. Further North a
weak cold front is approaching the PZ5 waters with 20-30 kt in
advance of the frontal boundary. A ridge axis extends NE-SW from
the SW corner of Oregon across the region. An altimeter pass from
03Z shows seas near 17 ft just West of the PZ5 waters. This
agrees well with buoy 46036 which reported 15 ft at 08Z.
The overall forecast pattern hasn`t changed much over the last
few model cycles. The Northern stream will remain progressive as
a series of short-waves track East then Northeast around the
periphery of the ridge axis. This will result in primarily SW
flow over much of the PZ5 waters. Further south the pattern will
continue very stable as the ridge/trough combination persists
during the week. The gradient will fluctuate...occasionally
reaching gale force...mainly during the period from Thursday
night through Friday. A cold front moving SE into the California
waters will disrupt the pattern Wednesday night into Thursday.
ONce the front clears the waters the pressure gradient will
strengthen again along the California coast with gales extending
North in the vicinity of Point Reyes.

The 00Z global models are in pretty good agreement through the
week...while only minor differences indicated over the first 5
days. I will populate the wind grids using a 50/50 blend of the
10M and 30M winds. Will also increase winds a couple of knots
early today to better capture the initial gales along the
Southern California coast.

seas...both the ENP and WAM initialized OK across the region with
only minor differences indicated between the two models. 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...
.PZZ820...Inner Waters from Point St. George to Point Arena...
     Gale Possible Friday night.
     Gale Possible Saturday night into Sunday.
.PZZ825...Inner Waters from Point Arena to Pigeon Point...
     Gale Possible Friday into Friday night.
     Gale Possible Saturday night into Sunday night.
.PZZ925...Outer Waters from Point Arena to Pigeon Point...
     Gale Possible Sunday.
.PZZ830...Inner Waters from Pigeon Point to Point Piedras Blancas...
     Gale Possible Thursday night.
     Gale Possible Friday night.
     Gale Possible Sunday into Sunday night.
.PZZ930...Outer Waters from Pigeon Point to Point Piedras Blancas...
     Gale Possible Friday night.
     Gale Possible Sunday into Sunday night.
.PZZ835...Inner Waters from Point Piedras Blancas to Santa Cruz Island, CA...
     Gale Possible Thursday night.
     Gale Possible Sunday.
.PZZ935...Outer Waters from Point Piedras Blancas to Santa Cruz Island, CA...
     Gale Possible Sunday into Sunday night.
.PZZ840...Inner Waters from Santa Cruz Island, CA to San Clemente Island, CA...
     Gale Possible Thursday night.

$$

.Forecaster Shaw/Kells/Shaw. Ocean Prediction Center.



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