The National Weather Service has just issued a tornado warning. This is the bulletin that just went out shortly after 8 a.m.:

Tornado Warning
National Weather Service Boston/Norton MA
817 AM EDT Sun Jul 16 2023

The National Weather Service in Boston/Norton has issued a

• Tornado Warning for…
  West central Essex County in northeastern Massachusetts…
  Northeastern Middlesex County in northeastern Massachusetts…

• Until 845 AM EDT.

• At 817 AM EDT, a severe thunderstorm capable of producing a tornado
  was located over Maynard, or 9 miles northeast of Marlborough,
  moving northeast at 30 mph.

HAZARD…Tornado.

SOURCE…Radar indicated rotation.

IMPACT…Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.

• This dangerous storm will be near…
  Lowell, Billerica, Chelmsford, Westford, Acton, Concord, Bedford,
  Groton, Littleton and Carlisle around 825 AM EDT.
  Tyngsborough around 830 AM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.