Correlation between Slow/Below Average Tornado Seasons and Hurricane Season

[TheStormExpert]

I know this topic was probably brought up in the past but since yet again for the 5th consecutive season we are having below to well below average Tornado count in the U.S. I thought I'd create a new discussion topic on it. Not to mention the bust of a potentially big Tornado Outbreak yesterday that only produced 5 tornadoes.

What do you think is causing these slow and quiet tornado seasons and why have there been so many of them in a row?

Also, what affect if any could and will this have on the upcoming 2016 Atlantic Hurricane Season?

[Alyono]

tornado season is often slow during an el niño

[TheStormExpert]

tornado season is often slow during an el niño

2012, 2013, and 2014 were not El Niño years and we still saw slow tornado seasons.

[Alyono]

not quite as slow as last years.

2012 had a bad early season outbreak. 2013 has quite a few bad ones as well. Not as sure about 2014

[HurricaneRyan]

Probably whatever is causing all the late season snow storms and why it's almost May and we're still getting rain here and there in Southern California.

I feel like there is more of a correlation with major tornado years and hurricane season.

The three most active years on record - 2004, 2011 and 2008, all saw major hurricanes hit the US.

2004 - 1800+ tornadoes, and Hurricanes Charley, Frances, Ivan and Jeanne
2008 - 1692 tornadoes, and Hurricanes Gustav and Ike
2011 - 1711 tornadoes, including the Super Outbreak and Joplin tornado, plus Hurricane Irene

in addition, 2003 saw the most tornadoes recorded in the month of May, and we saw Hurricane Isabel strike the US later that year.

Then, there were two years where activity in May was pretty low - 2005 and 2012. And both of those years had an active hurricane season.
2005 - Low tornado count for May, but we had Katrina, Rita, Dennis, Emily and Wilma hit the US
2012 - Low tornado count for May, but we had Isaac and Sandy hit the US.

I'll also factor in this:
1999 - the Moore OK F5, plus Hurricane Floyd later in the year.
1998 - very active year for tornadoes, plus Hurricane Georges and Hurricane Mitch
2007 - the first EF5 recorded in the US, and two category fives made landfall that season (Dean and Felix)

Now if we want to go onto the slower end:
2002 - less than 1000 tornadoes, and a below average season in the sense of only four hurricanes. Isidore and Lili weren't as strong at landfall in the US as they were in the GOFM or Yucatan landfall.
2000 - not a memorable tornado season, and no major hurricanes impacted the US, but they were still average or above average

I think there is a correlation somewhere, just don't know exactly what.