The National Weather Service considers a thunderstorm to be severe if it produces hail 3/4 inch or larger, wind 58 mph or stronger, or tornadoes.
Watches are issued when conditions are favorable for tornadoes, severe thunderstorms or flash floods. If you are in a watch area, make plans to seek shelter if necessary.
Warnings are issued when severe weather has been reported or is imminent. Seek shelter immediately if you are in or near the path of the storm. Warnings are issued by county names. Know the name of the county you live in and the counties that surround you.