I did a correlation of annual and spring (March to May) tornado with hurricanes since many are wondering if there is a relationship with tornadoes and hurricane season. This is from 1950 to 2010.
http://www.spc.noaa.gov/wcm/
Here is what I found interesting.
Annual Tornado Total
Named Storms
r = 0.34
p = 0.01
Hurricanes
r = 0.13
p = 0.33
Major Hurricanes
r = 0.02
p = 0.87
Total US Landfall
r = 0.32
p = 0.01
Major Landfall
r = 0.17
p = 0.19
The more the annual tornadoes there are, the more likely we are going to see named storms making landfall.
March to May Tornado Total
Named Storms
r = 0.23
p = 0.08
Hurricanes
r = 0.02
p = 0.91
Major Hurricanes
r = -0.01
p = 0.95
Total US Landfall
r = 0.28
p = 0.03
Major Landfall
r = 0.00
p = 0.98
The more the spring tornadoes there are, the more likely we are going to see named storms making landfall. However, major landfalls can go either way, regardless of how many annual and spring tornadoes there are.
