Not really; it is just (bad) luck of the draw. As another person who has lived in tornado alley for nearly half of my life, I've never seen a tornado. I've certainly seen the aftermath, but never physically seen a tornado on the ground. Witnessed Joplin, MO's EF-5 and Linwood, KS's EF-4 destruction up close; it takes your breath away to see that kind of damage. The likelihood, however, of it happening to YOU is just so minimal due to the small concentrated path of a tornado...and even then the majority of tornadoes are minor EF-0 to EF-1s, that is just isn't that big of a worry.
There are also two distinct regions that see tornadoes: tornado alley and dixie alley. Dixie alley sees their share of tornadoes earlier in the year (Feb-Mar) while tornado alley sees them later (Mar-May) due to localized temps and weather patterns.
Regardless of that, tornadoes can and do happen anywhere at any time of the year. All it takes are the three key ingredients: warm, most air near the ground + cooler, dry air above + wind shear. That temperature gradient gives you the rising warm air and sinking cool air that leads to thunderstorm development.
In the end, nothing has changed weather wise. What HAS changed is better forecasting and warning abilities. Plus the fact populations have moved in to areas that previously would have seen tornadoes without any effect on life or property. Then, there is a once in a lifetime situation like this where a tornado has never been witnessed to be on the ground for this long.
