Tough one.......
Get good at taking pictures......get good at chasing storms....
Shoot tons of pictures and videos of such storms, on your own money.
Be in the right place at the right time, with a camera, and be first to report the story.
Earn the trust of one TV meteorologist. Show him/her some of your work.
Or, post it to YouTube or other video sites. Your work MIGHT get bought.
Can happen overnight, but NOT likely.
If you are into chasing to make money, stop now......
However, if you really love severe weather and all it entails, welcome to the hobby.
See some of the other posts, about RADAR software (Gibson Ridge), in this forum.