There is already a statistically significant increase in severe weather events.

See Attribution of Extreme Weather Events in the Context of Climate Change (2016) by the U.S. National Academy of Sciences.

The volume pdf can be freely downloaded upon registration.

https://www.nap.edu/catalog/21852/attribution-of-extreme-weather-events-in-the-context-of-climate-change

Glad I could help clear this up for you!