North Pacific Marine Weather Discussion

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AGPN40 KWNM 170820
MIMPAC

Marine Weather Discussion for N Pacific Ocean
NWS Ocean Prediction Center Washington DC
120 AM PDT Fri Aug 17 2018

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

There was an ASCATB pass at around 06Z with a swath across much
of the offshore waters with the exception of the ern region of 
the srn CA waters. The strongest winds to 25 kt were along the 
nrn areas of the inner WA and also a small area of the nrn CA 
waters associated with a trof over the inner waters where winds 
should increase to 30 kt later tonight and Sat as trof 
intensifies along the N coast.

A high pressure ridge will continue to remain to the W of the  
offshore waters from early this morning through Tue night. The
ridge will gradually become weaker by Sun night through Tue
night. Model guidance shows a trof over inland CA will intensify
near the nrn CA coast today and persist into Sun. Model guidance
shows the strongest winds to 20 or 25 kt at 06Z along the nrn 
inner WA waters which match with the 06Z ASCATB pass and also 
along or E of the inner nrn CA waters. Winds along the inner nrn 
CA waters should increase to 30 kt later this afternoon or 
tonight and persist into Sat. Will continue to use the GFS for 
the grids through Tue night with little adjustment to its output.

Seas...00Z WWIII enp and ECMWF wam guidance are similar through
the forecast with the only exception occurring with the ECMWF
being slightly higher with seas over inner water of the nrn CA
waters. Will populate with the ECMWF wam through the forecast
period. 

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

.WARNINGS...Preliminary.

.PZ5 Washington/Oregon Waters...
     None.

.PZ6 California Waters...
     None.

$$

.Forecaster Rowland. Ocean Prediction Center.