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A school bus is pushed through the front of a building after a tornado swept through Henryville, Ind., Friday March 2, 2012. The storm was part of a system that brought high winds and heavy rain to parts of Indiana, Kentucky and Tennessee. (AP Photo/Philip Scott Andrews)

A school bus is pushed through the front of a building after a tornado swept through Henryville, Ind., Friday March 2, 2012. The storm was part of a system that brought high winds and heavy rain to parts of Indiana, Kentucky and Tennessee. (AP Photo/Philip Scott Andrews)

Twisters leave trail of tears

In what may be the biggest daily tornado outbreak on record for March, an entire month's worth of twisters struck in a single day.