What criteria do you use to determine a worthy "tornado day"?

Jeff,

Another quick thought is that SPC annual tornado trends over the past decade or so show a that quite often, the tornado "season" takes a momentary break in early May. A lot of years saw a small flat-line (extreme example is 2011) in early May. This is reflected by a small gap in total tornado reports during the time. In some years, the drop-off is during the first week of May, while other years it's shifted closer toward the second week.

A few thoughts:
1. This seems to be offset by high-end/historic events in late April.
2. Even though early May can be relatively quiet, there have been some higher-end events there as well.

I completely agree that early May smokes the water out of April.

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