There are a number of threads on this subject. Storm chacing used to be around a third of my annual gross, I did it as a subcontractor. The best way to do it is to find an a connection to a local company. Quite often a friend-of-a-friend type contact will make things work comfortable. I knew someone who knew Guy and I worked for him a few years ago, and got him hooked up with a number of other people. I think only one relationship flaked out.
You can loose your shirt if you are not carefull.
My experiance is that you need to get in to the area just days after the weather clears, the sooner the better. Within three to four weeks the good money had dried up, and the regular work sets in.
The storm has to be of a scale were the supply of skilled labor will not meet demand for those first few days, then you establish relationships that will carry you through for the next few weeks. Bringing some yard signs helps a lot.
Make sure you have enough working capitol to cover the first few days.
Never work out of town on an agreement to get paid by insurance money, "due on completion" with every job. Otherwise collecting is a PITB. (PITA is now grounds for infraction I gather
)
Tune everything up, bring extra chain, bee prepared to travel for a hotel room.
Two or three guys here say stumping is better money...