Updated Monday at 5:40 p.m.: The tornado warning that was issued Monday evening has since expired, though thunder storms are still possible in Middlesex County.
Original Story: A tornado warning was issued for Chelmsford and surrounding communities Monday.
The National Weather Service issued the warning at about 4:50 p.m. The warning was in effect until 5:30 p.m.
"Go to a basement or interior room on lowest floor," the Massachusetts Emergency Management Agency said in a statement. "Stay away from windows."
The warning was issued for the following communities: