Tuesday’s Stormy Weather ~ A Tornado Watch In Effect Until 9 pm

A tornado watch, valid until 9 pm on August 4, was issued for much of New England at 12:42 pm.

What does it  the designation Tornado Watch mean?

• ‘Tornado Watch: Be Prepared! … Watches are issued by the Storm Prediction Center for counties where tornadoes may occur. The watch area is typically large, covering numerous counties or even states.
• Tornado Warning: Take Action! A tornado has been sighted or indicated by weather radar.