It's important to understand the difference between Severe Weather Watches & Warnings.

A Severe Thunderstorm Watch is issued when severe thunderstorms are  possible in and near the watch area. It does not mean that they will  occur. It only means they are possible.

Severe thunderstorms are defined as follows:
1) Winds of 58 mph or higher
AND/OR
2) Hail 1 inch in diameter or larger.

A Severe Thunderstorm Warning is issued when severe thunderstorms are occurring or imminent in the warning area.

Severe thunderstorms are defined as follows:
1) Winds of 58 mph or higher
AND/OR
2) Hail 1 inch in diameter or larger.

A Tornado Watch is issued when severe thunderstorms and tornadoes are  possible in and near the watch area. It does not mean that they will  occur. It only means they are possible.

A Tornado Warning is issued when a tornado is imminent. When a tornado warning is issued, seek safe shelter immediately!