marine weather discussion for N Pacific Ocean NWS ocean prediction center Washington DC 224 am PDT Tue Jul 25 2017
.Forecast discussion...Major features/winds/seas/significant .Weather for the North Pacific N of 30n and E of 150w.
No Gale Warning headlines in this issuance since gales diminished over tonight as high pressure to the west continues to drift farther west and inland low pressure trough weakens and has resulted in a relaxed pressure gradient. However, gale force winds still linger just east of the central waters. Geocolor satellite images still show clearing skies over the pz5 waters but quite cloudy elsewhere. Maximum winds are just below gale force range over the central waters and mostly from the north. 5 to 15 kt winds from the northwest are over the southern waters. The NCEP map at 06z has high pressure 1030 mb west of the region that extends a ridge into the northern and southern waters. Inland low pressure stretches southeast near the coast from low pressure over northern California. Pressure gradient is relatively tight over the central waters.
Models GFS/CMC/ukmethr/ecmwfhr/NOGAPS/NAM have suited well with the 06z surface observations. The models only have high pressure and inland trough as main synoptic features to agree on and they show continued agreement in the short term. Will therefore retain the winds from the previous forecast by using GFS in the short term and then switch to ecmwfhr in the extended period.
.Seas...They are relatively large over the central waters with a 10 ft peak. Otherwise seas range between 4 and 6 ft over the far south and far north waters. Nww3 and ecmwfwave models have shown good agreement with the 06z observed seas pattern. Will use enp for seas. In the short term, seas will remain relatively high over the central waters.
.Extratropical storm surge guidance...N/A.
.Pz5 Washington/Oregon waters... None.
.Pz6 California waters... None.
.Forecaster musonda. Ocean prediction center.