Supercells are the king of thunderstorms. They can tower 10 or more miles tall, spin like a top and produce the most extreme weather on the planet. They drop hail the size of melons, can spawn ...

Satellite images show what CIRA (Cooperative Institute for Research in the Atmosphere) described as tornadic supercells across Nebraska and Iowa on Thursday (April 17). The National Weather Service ...

Multiple tornadoes were reported Thursday evening from two supercell thunderstorms that traveled from Nebraska into Iowa.