A strong likelihood of an historic hurricane season is news. At a minimum it alerts people in hurricane areas to plan ahead.

How good are these predictions?

Good enough to convince insurance companies to raise rates above the current extra $4000 Florida homeowners pay for hurricane insurance.[1][2]

[1] https://www.wptv.com/money/real-estate-news/hurricane-season...

[2] https://www.wptv.com/money/real-estate-news/coverage-collaps...