If you check out weatherunderground.com, and enter the area you are interested in (say, Key West
, or Miami) and then click on Marine forecast
(5th blue link down under the radar
thumbnail image) - you will get exactly what you are looking for.
For instance - I jsut typed in Key West
, then hit Marine Forecast
, and the beginning of the forecast synopsis reads:
An Atlantic ridge of high pressure over central Florida
will move slowly southward through Thursday...before sliding near the Keys late this week into the weekend. The approximate shoreward edge of the Gulf Stream as of July 26, 2010... 15 nm S of Dry Tortugas
light...on Loggerhead Key. 11 nm S of Cosgrove Shoal light...off the Marquesas
Keys. 13 nm S of Sand Key light...off Key West. 19 nm S of Looe Key...off Big Pine Key. 19 nm S of Sombrero Key light...off Marathon. 8 nm se of Alligator Reef light...off Islamorada. 5 nm se of Molasses Reef light...off Key Largo
. 2 nm E of Carysfort Reef light...off Ocean Reef. Gulf Stream information courtesy of the naval oceanographic office
Have at it.