According to Krissy Hurley, the Meteorologist in charge at the Nashville National Weather Service, Tennessee leads the country in nighttime tornadoes.
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Shit, nighttime tornadoes are all we have in Tennessee, at least in my area.
I've been here almost 8 years and have been through I don't know how many tornado warnings/watches, and I don't recall a single one in the daytime. Sure, we'll get advance notice during the day that conditions will be right for a tornado later in the evening, but we never get the actual warning or watch until after nightfall, and it's usually 1 or 2 o'clock in the morning.