For the second year in a row, multiple tornadoes have struck the U.S. on the 17th day of November. This may seem surprising, but November tornadoes are actually not all that uncommon.
According to our Severe Weather Expert Dr. Greg Forbes, the second half of October, and especially November, can often be a second season for tornadoes and severe thunderstorms.
Forbes says, "In many ways, this is the counterpart to spring, when strong fronts and upper-air systems march across the United States. When enough warm, moist air accompanies these weather systems, the unstable conditions yield severe thunderstorms and sometimes tornadoes."
The interactive map below shows how many tornadoes have been confirmed by the National Weather Service during the month of November from 1950 through and including 2013. Texas has the most, but when adjusted for total area, Mississippi has the most (followed closely by Louisiana and Alabama).
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