Get indoors when you hear thunder. Do not resume outdoor activities until at least 30 minutes after the storm has passed. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. For your safety, go indoors or to your vehicle.

A strong thunderstorm will impact portions of southwestern Essex, north central Norfolk, Suffolk and northeastern Middlesex Counties through 800 PM EDT... At 659 PM EDT, Doppler radar was tracking a strong thunderstorm over Billerica, moving southeast at 20 mph. HAZARD...Winds in excess of 40 mph. SOURCE...Radar indicated. IMPACT...Strong winds could cause minor damage such as downed branches. Locations impacted include... Boston, Lowell, Cambridge, Quincy, Newton, Somerville, Waltham, Malden, Brookline, Medford, Revere, Arlington, Everett, Billerica, Woburn, Chelsea, Chelmsford, Andover, Watertown and Lexington. MAX HAIL SIZE...0.00 IN MAX WIND GUST...40 MPH