Marine Interpretation Message
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000
AGPN40 KWNM 161505
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
805 AM PDT Wed Aug 16 2017

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

The 12Z OPC surface analysis shows high pressure well west of the
waters with an inland trough over northern California. Northerly
flow persists over the southern PZ5 and northern PZ6 waters, with
an overnight ASCAT-A pass depicting winds to 30 kt over the coastal
waters off Point Saint George.

The 06Z GFS along with the 00Z ECMWF/UKMET continue to support a
brief period of gales over the far northeast portion of PZZ820
tonight as high pressure moves eastward and the pressure gradient
tightens. In fact, periods of gales appear likely for the next
several days over the northern California and southern Oregon
coastal waters as diurnal heating strengthens the gradient off
the coast. Over our waters, will maintain the marginal gale
warning for Friday night as there is enough support from the
GFS/UKMET to warrant keeping it in the grids for now. There is
higher confidence in an extended gale event Saturday night into
Sunday night for PZZ820, as well as the adjacent coastal waters,
with a fairly strong signal noted in the GFS/ECMWF/UKMET.
Overall, will continue to favor the GFS winds with this update.


.SEAS...The 12Z sea state analysis indicated the NWW3 ENP and
ECMWF WAM were both running a bit low this morning off the
northern California coast. The inherited grids were adjusted
upward slightly in this area through tonight to better match up
with the adjacent coastal waters. Otherwise, the 00Z ENP was
favored through the 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 tonight.
     Gale Possible Friday night.
     Gale Possible Saturday night into Sunday night.

$$

.Forecaster Reinhart. Ocean Prediction Center.



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