Marine Weather for HS 102


marine weather discussion for N Pacific Ocean NWS ocean prediction center Washington DC 211 am PDT Wed Aug 23 2017

.Forecast discussion...Major features/winds/seas/significant .Weather for the North Pacific N of 30n and E of 150w.

Pressure gradient is still fairly relaxed and will remain slack through the forecast period keeping winds below gale force and seas will only peak at 12 ft over the central waters. Satellite images continue to show mostly cloudy skies across the region with cyclonic circulation still depicted in the Gulf of Alaska. Latest observations including scatterometer pass at 0530z show winds ranging between 10 and 20 kt over the central region and between 5 and 15 kt over the southern and northern waters. At 06z, NCEP weather map now has broad high pressure with main center over central Pacific with a secondary center 1026 mb near 35n145w with ridges that extend northeast into the north and southeast into the southern waters while inland low pressure over Nevada and Arizona border area still stretches a trough northwest across California state then into the central waters. Pressure gradient is still well relaxed across the region. Models GFS/CMC/ecmwfhr/ukmethr/NAM have continued to initialize well these few synoptic features and they still show good agreement on keeping high pressure to the west of the region while inland trough will persist over California. Will continue to follow closely GFS for winds.

.Seas...Seas continue to range between 3 and 6 ft across the region with a peak at 7 ft over the far northwest waters. Wave models nww3 and ecmwfwave still fit well the observed seas pattern. The wave models have been quite consistent with previous observations and are also in good agreement on keeping seas small but build to 12 ft over the central waters. Will therefore not deviate from previous model choice and so will stay with nww3. Seas will remain relatively high over the central waters peaking at 11 ft.

.Extratropical storm surge guidance...N/A.


.Pz5 Washington/Oregon waters... None.

.Pz6 California waters... None.


.Forecaster musonda. Ocean prediction center.

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