https://www.scientificamerican.com/article/possible-links-between-warming-and-tornadoes-are-still-murky/

Among natural disasters, tornadoes are notoriously difficult to predict. They require a complex set of conditions in order to form, some of which scientists still don't fully understand, and forecasting is rarely accurate more than a week or two in advance.

That makes it even harder to parse out the potential influence of global warming on tornado season.