One was Tropical Storm Allison in 2001, which brought around 40 ... up more than 60 tornadoes along its nearly 1,200-mile-long path from the Texas coast to upstate New York." ...

The rains have broken all-time records, exceeding the rainfall totals seen during Tropical Storm Allison in 2001. There may be no parallel available to any other rainstorm in U.S. history ...