A couple of programmers at the University of South Carolina put together this handy tide tool. Check out their update on San Juan, PR tides.

Scripps does it again with this big-picture map of NE pacific swell action.

Weather Services International, AKA Intellicast, maintains a dense pile of global weather. See their overview of weather for Mexico and Central America here.

The Weather Underground pulls together marine forecast links from around the globe, including Mexico.

Track storm activity over Mexico with the SkyWatch infrared satellite pics.

NOAA keeps a list of pictures from space that includes shots of the North Pacific and Caribbean basin on their Geostationary Satellite Server.