On this day, 100 years ago, the Great Blue Norther of 11/11/11 swept across the central United States. It was a cold snap that caught much of the country off guard with sudden, extreme drops in temperature. Many cities saw record highs early in the day, only to find the temperature dropping to record lows hours later. Winds kicked up dust storms in Oklahoma and nine tornados in 4 states. An F4 twister struck a town in Wisconsin, and survivors found themselves in the midst of a blizzard not an hour later.