Know what to look for...Environmental clues
- dark, often greenish sky
- wall cloud- A wall cloud, or pedestal cloud, is a cloud formation associated with thunderstorms. It is a marked lowering typically beneath the rain-free base (RFB) portion of a deep cumulus cloud. Most strong tornadoes form within wall clouds.
- large hail-
- Pea 0.25"
- Dime 0.75"
- Quarter 1.00"
- Golf Ball 1.75"
- Tennis Ball 2.50"
- Base Ball 2.75"
- Grapefruit 4.00"
- Giant 4.00+
- loud roar, similar to a freight train
- some tornadoes appear as a visible funnel extending only partially to the ground
- some tornadoes are clearly visible while others are obscured by rain or nearby low-hanging clouds.