Dream: Tornado, asteroid and a murderer?

The other night I had a dream where there were tornados and asteroids all in one dream. I remember standing on my front porch with my mom telling me that the tornados were harmless and we would be ok then the next hting i knew an asteroid came from the sky hitting the earth next to a cop car in our neighbors yard but when the asteroid hit it didnt cause an explosion of fire, when it hit fireworks came from it. This same night I had gotten up with my son and fell back asleep well in the next dream I was being chased by a guy who wanted to kill me and I remember driving away from my grandmothers house and I look in my review mirror and someones in my back seat I dont know who it is so I turn around to look and here it is my mom and I about jump out of skin I was so scared it woke me up. Can anybody help with at least the tornados and asteroids?? (sorry this is so long)