Zeigler: A wall cloud, on the other hand, is the beginning of a tornado and typically from a supercell (isolated) thunderstorm. Wall clouds are not as large or long as a shelf cloud, and look more ...

A supercell thunderstrom in Oklahoma ... If the conditions are right, a tornado will form underneath the wall cloud. By the time severe weather hits, it's already too late. Disaster preparedness ...

Some severe weather outbreaks don't produce as many tornadoes, but one or more supercell thunderstorms spin up large, long-track deadly twisters that are notable even in tornado-prone states.

A large supercell tornado was spotted west of Memphis, Tennessee on Wednesday. Sirens went off in the city, warning residents of a twister hitting populated areas. The National Weather Service ...

prompting the issuance of an urgent Tornado Emergency as the supercell passed through communities such as Lake City and Blytheville. The FOX Forecast Center described the storm as a "wedge tornado ...