Scattered showers and thunderstorms formed ahead of an approaching cold front. Plenty of warm air and moisture advection on unilateral southerly flow provided the instability and shear to be conducive for thunderstorm development.

Tornado in HOWARD, MARYLAND
From 21-JUN-16 12:29:00 to 21-JUN-16 12:48:00 (EST-5)
Location: FLORENCE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The National Weather Service, Baltimore-Washington DC Weather
Forecast Office, conducted a survey of storm damage that occurred in
western Howard County Maryland from severe storms that struck that
county shortly after 1 pm EDT on Tuesday, June 21, 2016. Estimated maximum wind speed was 80 mph, making the tornado an EF-0.
Initial tornado touchdown was established near the intersection of
Old Annapolis Road and St. Michaels Road just southwest of Lisbon at
129 PM EDT. Properties there sustained tree damage with multiple
trees snapped, uprooted, and topped in multiple directions. A large
garage had its doors bowed by the wind. Small objects were lofted.
The tornado continued towards the southeast, passing through the
areas of Glenwood and Glenelg, before lifting just before Ellicott
City in the vicinity of Manor Lane and Carroll Mill Road. Along its
path, the tornado caused nearly continuous tree damage, with large
trees and tree branches snapped, uprooted, and topped in multiple
directions. The trees downed many power lines and blocked multiple
roads. Some trees and large branches fell on homes and garages.
There were a few instances of minor roofing damage from the wind,
but largely home damage was limited to tree falls. Several small
outbuildings were either damaged or destroyed.
Minor wind damage from strong thunderstorm winds continued southeast
into Ellicott City, but no tornado damage was found. Tree damage from thunderstorm downburst (straight-line) winds was noted as far west as Schafferville Rd, between Long Corner Rd and Florence Road.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 21-JUN-16 11:42:00 to 21-JUN-16 11:42:00 (EST-5)
Location: EDGEMONT
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down in the 13000 block of Ritchie Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 11:56:00 to 21-JUN-16 11:56:00 (EST-5)
Location: CATOCTIN FURNACE
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down on Brice Rd near Kelly's Store Rd.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-JUN-16 12:21:00 to 21-JUN-16 12:21:00 (EST-5)
Location: BROWNINGSVILLE
Magnitude: 50.00 EG
Reported by: Emergency Manager

Multiple trees and wires down blocking Barnesville Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 12:05:00 to 21-JUN-16 12:05:00 (EST-5)
Location: FREDERICK
Magnitude: 50.00 EG
Reported by: 911 Call Center

Multiple trees were down on Shookstown Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 12:05:00 to 21-JUN-16 12:05:00 (EST-5)
Location: WOODSBORO
Magnitude: 50.00 EG
Reported by: Department of Highways

A tree was down near the intersection of MD 550 and Bennie Duncan Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 12:17:00 to 21-JUN-16 12:17:00 (EST-5)
Location: UNIONVILLE
Magnitude: 61.00 EG
Reported by: Public

Numerous trees were uprooted and snapped. A roof of a barn was completely blown off.

Thunderstorm Wind in HOWARD, MARYLAND
From 21-JUN-16 12:45:00 to 21-JUN-16 12:45:00 (EST-5)
Location: COOKSVILLE
Magnitude: 55.00 EG
Reported by: Trained Spotter

Multiple large trees down.

Thunderstorm Wind in HOWARD, MARYLAND
From 21-JUN-16 12:51:00 to 21-JUN-16 12:51:00 (EST-5)
Location: BRINKLEIGH MANOR
Magnitude: 50.00 EG
Reported by: Department of Highways

A tree was down blocking SB US 26 westbound at Interstate 70.

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 12:53:00 to 21-JUN-16 12:53:00 (EST-5)
Location: TUSCARORA
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down along Greenfield Rd.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 21-JUN-16 12:55:00 to 21-JUN-16 12:55:00 (EST-5)
Location: OELLA
Magnitude: 50.00 EG
Reported by: 911 Call Center

A large tree fell onto power lines at the intersection of Westchester Ave and Frederick RD.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:02:00 to 21-JUN-16 13:02:00 (EST-5)
Location: TIPTON AAF ARPT
Magnitude: 50.00 EG
Reported by: Other Federal Agency

A tree was down on Bald Eagle Dr just south of Route 198.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:05:00 to 21-JUN-16 13:05:00 (EST-5)
Location: STONY RUN
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees down in the median southbound I-295.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:07:00 to 21-JUN-16 13:07:00 (EST-5)
Location: (BWI)BALTMOR-WSHNGTN
Magnitude: 54.00 MG
Reported by: ASOS

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 21-JUN-16 13:14:00 to 21-JUN-16 13:14:00 (EST-5)
Location: HILLMEADE
Magnitude: 50.00 EG
Reported by: Newspaper

A tree fell onto a house at the 12300 block Lisborough Rd. Reported by Washington Post.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:16:00 to 21-JUN-16 13:16:00 (EST-5)
Location: CROWNSVILLE
Magnitude: 50.00 EG
Reported by: 911 Call Center

A large tree was down at the intersection of Severn Chapel Rd and Waterbury RD.

Hail in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:17:00 to 21-JUN-16 13:17:00 (EST-5)
Location: BRIDEWELL
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 21-JUN-16 13:17:00 to 21-JUN-16 13:17:00 (EST-5)
Location: BELTSVILLE ARPT
Magnitude: 50.00 EG
Reported by: Other Federal Agency

Multiple trees down near NWR visitors center.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 21-JUN-16 13:17:00 to 21-JUN-16 13:17:00 (EST-5)
Location: COLLINGTON
Magnitude: 50.00 EG
Reported by: Newspaper

A tree fell on a car in Bowie Town Center. Reported by Washington Post.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 13:22:00 to 21-JUN-16 13:22:00 (EST-5)
Location: CROWNSVILLE
Magnitude: 55.00 EG
Reported by: 911 Call Center

Many power lines down at the intersection of River Rd and Old General Hwy.

Hail in MONTGOMERY, MARYLAND
From 21-JUN-16 13:25:00 to 21-JUN-16 13:25:00 (EST-5)
Location: MONTGOMERY VLG
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in HOWARD, MARYLAND
From 21-JUN-16 13:40:00 to 21-JUN-16 13:40:00 (EST-5)
Location: DORSEY
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees down around the fairgrounds.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 14:31:00 to 21-JUN-16 14:31:00 (EST-5)
Location: DAVIDSONVILLE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Multiple large trees down on power lines at the intersection of West Central Ave and Queen Anne Bridge Rd.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 21-JUN-16 14:35:00 to 21-JUN-16 14:35:00 (EST-5)
Location: RUTLAND
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down at the intersection of St George Barber Rd and Spring Lakes Dr.

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:43:00 to 21-JUN-16 14:43:00 (EST-5)
Location: ST CHARLES
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:45:00 to 21-JUN-16 14:45:00 (EST-5)
Location: MC CONCHIE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:48:00 to 21-JUN-16 14:48:00 (EST-5)
Location: ST CHARLES
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:50:00 to 21-JUN-16 14:50:00 (EST-5)
Location: ST CHARLES
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:53:00 to 21-JUN-16 14:53:00 (EST-5)
Location: MATTAWOMAN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CHARLES, MARYLAND
From 21-JUN-16 14:58:00 to 21-JUN-16 14:58:00 (EST-5)
Location: MATTAWOMAN
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in MONTGOMERY, MARYLAND
From 21-JUN-16 16:20:00 to 21-JUN-16 16:20:00 (EST-5)
Location: HYATTSTOWN
Magnitude: 1.50 
Reported by: Public

Thunderstorm Wind in FREDERICK, MARYLAND
From 21-JUN-16 16:21:00 to 21-JUN-16 16:21:00 (EST-5)
Location: FOUNTAIN MILLS
Magnitude: 50.00 EG
Reported by: Department of Highways

A large tree limb was blocking Maryland 75 South near Price Rd.

Hail in FREDERICK, MARYLAND
From 21-JUN-16 16:32:00 to 21-JUN-16 16:32:00 (EST-5)
Location: KNOXVILLE
Magnitude: 1.00 
Reported by: NWS Employee

Hail in FREDERICK, MARYLAND
From 21-JUN-16 16:38:00 to 21-JUN-16 16:38:00 (EST-5)
Location: BRUNSWICK
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WASHINGTON, MARYLAND
From 21-JUN-16 18:12:00 to 21-JUN-16 18:12:00 (EST-5)
Location: KEEDYSVILLE
Magnitude: 1.25 
Reported by: Public

Hail in WASHINGTON, MARYLAND
From 21-JUN-16 18:22:00 to 21-JUN-16 18:22:00 (EST-5)
Location: LOCUST GROVE
Magnitude: 1.25 
Reported by: Public

Hail in FREDERICK, MARYLAND
From 21-JUN-16 18:34:00 to 21-JUN-16 18:34:00 (EST-5)
Location: BROAD RUN
Magnitude: 1.75 
Reported by: Public

Hail in FREDERICK, MARYLAND
From 21-JUN-16 18:40:00 to 21-JUN-16 18:40:00 (EST-5)
Location: FEAGAVILLE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in FREDERICK, MARYLAND
From 21-JUN-16 18:45:00 to 21-JUN-16 18:45:00 (EST-5)
Location: FEAGAVILLE
Magnitude: 1.00 
Reported by: Trained Spotter