Hundreds Without Power in Westford

UPDATE, 9:26 p.m. About 20 customers are without power in Westford, according to National Grid's outage map. 

UPDATE, 8:45 p.m. National Grid's outage map is reporting nearly 300 Westford customers without power at this hour due to the recent storm. The estimated time for restoration is around 10 p.m. 

UPDATE, 5:39 p.m. The tornado warning has been called off, according to the National Weather Service. The storm alert remains in effect. 

The initial post is below: 

A tornado warning was issued for Westford and surrounding communities on July 7.

The National Weather Service issued the warning at about 4:50 p.m.  

The warning was issued for the following communities:

• Billerica
• Chelmsford
• Westford
• Acton
• Concord
• Bedford
• Lunenburg
• Littleton
• Lancaster
• Ayer
• Shirley
• Harvard
• Boxborough
• Carlisle

"Go to a basement or interior room on lowest floor," the Massachusetts Emergency Management Agency said in a statement. "Stay away from windows."

The National Weather Service included this in its alert:

"TAKE COVER NOW! LEAVE MOBILE HOMES AND GO TO A STRONG BUILDING. GO TO THE BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS. DO NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. IF YOU CANNOT SAFELY DRIVE AWAY FROM THE TORNADO...AS A LAST RESORT...EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN IN A LOW LYING AREA AND PROTECT YOURSELF FROM FLYING DEBRIS."

A severe thunderstorm alert is also underway and has been since about 4:30 p.m. with a possible flood threat in some areas. 

Currently, no homes are without power in Westford, according to the National Grid outage map, although there are a number of outages just west of town. More than 150 customers are without power in Shirley.