Even by Plains standards, this was an unusually large, violent tornado outbreak so early in spring. One Kansas tornado was ...

All tornadoes are spawned from a parent supercell, but not all supercells produce tornadoes. Damage from the 1999 F5 tornado that struck Moore, Oklahoma. Photo courtesy NOAA. Dr. T. Theodore ...

It was tracking a tornadic supercell into Mercer County ... initially rated the storm an F6 before it was reclassified as an F5. That scale would later become adopted nationwide as the benchmark ...

Supercell thunderstorms are responsible ... The rating system ranges from F0, the weakest cyclone, to F5, a vicious, deadly tornado, which a character in Twister deems the “finger of God.” ...

Giant supercell thunderstorm terrified residents ... in Wyoming Supercells are responsible for nearly all significant tornadoes in the U.S. and can produce winds of up 100mph ...

A supercell is a highly organized thunderstorm with some components that set it apart from other "garden variety" thunderstorms. Supercells have the capability to produce tornadoes, damaging hail ...

Tornadoes in the U.S. typically increase sharply in spring. Unfortunately, a few of those can be violent tornadoes, particularly in the South. On March 3, 1966, 59 years ago today, an F5 tornado ...