" How do you explain the fact that I had a dream of a shooting before I found out about an actual one that happened?"
How do _I_ explain it?
You had a dream, which included 'a shooting.'
Could have been a bar, a school, a church, a softball game, a football game locker room, Burning Man...
Could have been an AK47, an M60, an Uzi, a revolver, an automatic pistol...
When you got up, you read about a bar shooting. That discovery informed your memory of what happened. NOW your dream was of a bar shooting.
When you find out what weapon(s) was/were involved, those details will be added to your dream.
You wanna talk about proof from God? Wake up from a dream and call the cops to PREVENT a shooting.
Or maybe God could just stop the shooting directly? Lightning, or the Earth swallowing up the shooter? Or maybe the bullets turn to butter in mid-air? That'd be cool.