I think i know how to get an EF5.

step 1: go to a place with poorly built buildings, probably something in a place like south sudan.

step 2: spend all of the economy of everything on ceiling fans and superglue.

step 3. glue the fans inside of the clouds going over south sudan.

step 4. turn all of them on.

step 5: play classical music as a giant fucking wind column destroys everything.

step 6: hold the nws at gunpoint so they make it ef5

congratulations, you now have an ef5!