The National Weather Service has issued a severe thunderstorm watch Sunday evening for much of Maryland with 50 mph wind gusts possible.

BALTIMORE, MD — With a severe thunderstorms moving through parts of Baltimore and Harford counties, the National Weather Service has issued a severe thunderstorm watch Sunday evening, May 26, into early Monday for several counties and Baltimore City. A severe thunderstorm watch means thunderstorms may develop that could produce large hail or damaging winds.

At 8:32 p.m. a severe thunderstorm was located near Fallston, or 7 miles east of Cockeysville, moving southeast at 30 mph. The storm is capable of 60 mph wind gusts and quarter-size hail. Damaging winds will cause some trees and large branches to fall. This could injure anyone outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles.

Locations in a severe thunderstorm warning until 8:45 p.m. were Bel Air South, Bel Air North, Fallston, Pleasant Hills, Edgewood and Benson.

When a watch is issued, people can go about their normal activities, keeping an eye to the sky and an ear to the National Weather Service's weather radio or local media for updates and possible warnings. A severe thunderstorm is defined as producing hail the size of a quarter or larger and damaging wind gusts of at least 58 mph, according to the National Weather Service.

The severe thunderstorm watch is effective from 8:30 p.m. until 1 a.m. on Monday, May 27, for these counties:

  • Anne Arundel
  • Baltimore
  • Calvert
  • Carroll
  • Cecil
  • Charles
  • Frederick
  • Harford
  • Howard
  • Montgomery
  • Prince George's
  • St. Mary's
  • Washington
  • Baltimore City
  • District of Columbia

This includes the cites of Aberdeen, Annapolis, Arnold, Bel Air, Bethesda, Bowie, Camp Springs, Catonsville, Chesapeake Beach, Clinton, College Park, Columbia, Dundalk, Eldersburg, Ellicott City, Essex, Fallston, Gaithersburg, Germantown, Glen Burnie, Havre de Grace, Joppatowne, Laurel, Odenton, Pikesville, Potomac, Rockville, Severn, Severna Park, Silver Spring, Suitland-Silver Hill, Towson, Waldorf and Westminster.

Showers and thunderstorms likely before midnight, then showers likely and possibly a thunderstorm between midnight and 2 a.m., then scattered showers and thunderstorms after 2 a.m. are possible, the weather service says. Some storms could be severe, with large hail and damaging winds. Chance of precipitation is 70 percent. Rainfall between a quarter and half of an inch possible.

On Memorial Day the forecast calls for a 20 percent chance of showers. Partly sunny, with a high near 82.