I have made a fire outside. It is currently snowing. Will a tornado form where the fire meets the snow? ?

no. A tornado is a large scale meteorological event involving winds of hundeds of miles per hour. no way that could occur in your backyard.

no, it takes far more than differing temperatures to create a tornado.

don't feed the trolls

I am glad someone agrees with me! I have been trying to tell @billrussell42 the same thing. 

No, the snow will extinguish the fire, if it is heavy enough.

Sounds like a good ol' homeskool science project.