NEW PROVIDENCE, NJ - Union County is under a tornado watch until 5 p.m., according to the National Weather Service.
Thunderstorms are expected to hit the area after noon.
A watch just indicates that conditions may be favorable for tornadoes to develop. That is to be distinguised from a tornado warning, which is a more imminent situation in which a tornado has actually been spotted or rotation has actually been detected by radar.
In the case of a tornado warning, the safest place to seek shelter is in a basement or small interior room (such as a walk-in closet or bathroom), away from windows.