A developing gale low east of Japan will move ENE with winds developing 50-65 knots within 240 NM south of the center and seas building to 36 feet (about 11 meters) within the next 48 hours then turning northeastward.

NOAA OPC Surface Analysis

NOAA 48 Hour Surface Forecast

NOAA OPC 48 hour Significant Wave Height Forecast
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About Fred Pickhardt
I am a marine meteorologist and sailed briefly with American Export Lines in the Far East trade after graduating from State University of New York Maritime College. I have extensive experience in weather analysis, weather forecasting, optimum ship routing, vessel performance evaluations and forensic weather event reconstructions. I founded Ocean Weather Services and as Owner and Chief Consultant currently provide optimum ship routing services and forensic marine weather reports to the maritime industry.