Turkey has an access to the Aegean Sea (West and South sides of the country) and the Black Sea (North side of the country).
For Weather, the sailors usually use the following sites:
Furthermore the following site shows the realtime weather at bosphorus:
The following one is the website of the Turkish Official Meteorology Service; in cases where the weather force majure objection is raised, the Courts write writ to them in order to get the weather reports.
LIST OF TURKISH YACHT SEA PORTS | YACHT CLUBS: