Photo: Thunderstorms on the way.

Belmont, along with most of eastern Massachusetts, is under a severe thunderstorm watch until 8 p.m., Tuesday, Aug. 4.

The National Weather Service issued the warning at 12:20 p.m., advising residents to be prepared for the potential for the development of thunderstorms which may produce large hail or damaging winds.

When a watch is issued, people should go about your normal activities, but keep an eye to the sky and an ear to the National Weather Service’s weather radio or local radio and television stations for further updates and possible warnings.

In addition, a tornado warning has been issued for an area just to the west of Route 3 near Chelmsford for 2:30 p.m.