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National Weather Service (National Oceanic and Atmospheric Administration)
The National Weather Service provides weather, hydrologic, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas.  On this page, boaters can gain access to marine and river forecasts as well as weather information.

Weather Services International (WSI)
Rainbow Weather Services International detects, forecasts, and depicts disruptive weather across the nation and international waters. The business arm of the U.S. National Weather Service, Weather Services International maintains the world’s largest commercial meteorological database, incorporating data from the National Weather Service, military, and other agencies. Boaters will find detailed information and maps for local, national, and global weather. Weather Services International forecasts storms (tornados, cyclones, hurricanes) in the Pacific and Atlantic oceans and features satellite images of storms.

Tide, Waves, and Currents

Tidal Data
The Center for Operational Oceanographic Products and Services is a portal to tidal data and charts, current observations, and meteorological information. The Center for Operational Oceanographic Products and Services gathers oceanographic data that support safe maritime commerce, sound coastal management, and safe recreational boating across the United States. Visit the site to find accurate, reliable, and timely water-level and current measurements.

Tides, Waves, and Currents
The Nanoos Visualization System provides an interactive map that combines weather and oceanographic information to help boaters visualize all the conditions that might affect them. There are more interactive maps here that cover topics such as tuna fishers, maritime operations, and beach and shoreline changes.

Bar Conditions
The National Weather Service Forecast Office, Portland, Oregon provides information to help mariners safely navigate around bars. Information is updated every four hours or when local bar conditions change. Bar camera images and latest observations.