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000
AGPN40 KWNM 281414
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
714 AM PDT Fri Apr 28 2017

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

No significant changes to the forecast or headlines expected in
the upcoming forecast package.

Latest surface observations showing winds gusting to gale force
off the southern california coast, as well as in PZZ840 with buoy
46047 reporting gusts to 35 kt last hour. Further up along the
central California coast, coastal buoys are reporting gusts to
near gale force. Will keep gale warning for PZZ840 for today due
current reports of gusts to at least gale force. Gradient should
begin to relax enough later today for the winds to slowly subside
but can not rule out a few gusts to gale force continuing into
the evening hours.

SEAS...ENP within a foot or two of current observations. Buoy
46047 reported 15 ft at 12z, which was on target with latest wave
guidance.

-----------------------------------------------------------------
PREVIOUS DISCUSSION...

There was an ASCAT pass at 0548Z with a swath across the much of
the offshore waters between 121W and 127W with the exception of
the far ern areas of the srn CA waters. The strongest winds were
over the central and srn CA waters. Where data was available
there were gale force winds to 35 kt over the ern areas of srn CA
waters.

Coastal trough along California early this morning will gradually
become weaker later today into tonight as high pressure remains
to the W and NW of the offshore waters. Area of gales over the
ern areas of the srn CA waters this morning should become subgale
by later this afternoon into early tonight. Broader area of
moderate winds over the central and srn CA waters will support
winds to 30 kt today into tonight. By tonight as coastal trof
becomes weaker will have winds to 30 kt over the small area of gale
occurring this morning. On Sat and Sat night a cold front moves E
over the WA/OR waters with the GFS/GEM continuing to be stronger
with winds in advance of the front. Will continue to have winds
to 30 kt in association with the front. By late Sun into Mon the
high pressure to the W of CA and the coastal trof along CA
reintensifies with a broad area of moderate N to NW winds over
the central and srn CA waters. The development of gales seems not
to be likely for early next week in this region.

Seas...Will favor the WWIII initially today since it better
reflected higher seas at 06Z over the srn CA waters. By later tonight
through the rest of the forecast period the WWIII and ECMWF wam
are close agreement and will use a 50/50 blend.


.EXTRATROPICAL STORM SURGE GUIDANCE...N/A.



.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
.PZZ840...Inner Waters from Santa Cruz Island, CA to San Clemente Island, CA...
     Gale today.

$$

.Forecaster Achorn/Rowland. Ocean Prediction Center.



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