From the St. Augustine Record:

Floridians who fire a warning shot or threaten to use a gun could avoid criminal prosecution under a law signed Friday by Gov. Rick Scott.

[ . . . ]

The “warning shot” bill (HB 89) was partially inspired by the case of Marissa Alexander. The Jacksonville woman was initially sentenced to 20 years in prison after firing a shot near her estranged husband during an altercation. She contended she fired in self-defense, but a judge rejected her use of the “stand your ground” law that allows someone to use deadly force if they believe their life is in jeopardy.

The Alexander case aside (I don’t know all the details) I would certainly think that if you can scare an attacker off with a warning shot, that would be preferable to killing them, so, this is a good change to the law.