A tornado warning siren went off in the newsroom when FOX 32 Chicago meteorologists were covering the city’s severe weather on live TV. Watch how they react to the alarm.

It was just after 10 this morning when some TV viewers got a scare when their screens suddenly flashed the message: "Tornado Warning." It was all a test - but it wasn't labeled that way.

If you're not sure what you should do for a tornado warning vs. a tornado watch, here's the difference between these two terms — and why that matters.

What you should do during a tornado warning depends on where you are.

Forecasters are caught between sounding the alarm on a storm that doesn’t actually produce a tornado or dropping the ball and having a tornado touch down without a warning attached.

Watch a tornado swipe a Florida TV station while it was live on air Brooks Garner, the station’s meteorologist, was broadcasting tornado warning coverage when the twister hit.

Severe Weather Team 2 Chief Meteorologist Brad Nitz stresses that you have a plan in place in case of a tornado threat.

News stations cover tornado warnings because it's an incredibly important service that saves lives. A ticker scrolling tornado warnings along the bottom of the screen isn't enough.

When it comes to severe weather events like tornadoes and flash floods, what's the difference between a watch and warning, and which is worse?

JEFFERSON PARISH, La. — A Tornado Warning has been issued for areas in Jefferson until 4:15 PM. Seek shelter now and tune in to WWL-TV for the latest coverage.