As for the factors... I don't know any numbers, but say you have the best possible equipment available today.
As for the plane... Its all theoretical... I'm just wondering if it is possible. Assume no plane fly near where it is set up.
Would it be possible to use a MASER to vaporize a hole in a cloud?
How much would the current best MASERs spread out over a mile?
What's the farthest a MASER could be from an an object and still heat it up?