What is a possible explanation for why, given the correlation between La Niña and tornado hail frequency in the South Central U.S. stated above, 2021 and 2022 have been so significantly BELOW average following successive La Nina winters?  

https://www.spc.noaa.gov/wcm/2021/ptorngraph-big.png

https://www.spc.noaa.gov/wcm/2021/phailgraph-big.png

Thank you!