We have not come across any hadith speaking of what is mentioned in the question or the order of events mentioned, but there are hadiths which indicate that one of the signs of the Hour is the spread of immorality among people.

The drying up of the Sea of Galilee, which is also known as Lake Tiberias, is not a sign of the emergence of the Mahdi; rather it will only happen after the time of the Mahdi has ended, and it will happen as a result of the actions of Ya’jooj and Ma’jooj.