A warm front moved through the region and the Mid Atlantic was located in the warm moist sector.  Convergence led to numerous showers and thunderstorms to develop in an atmosphere with high shear.  Heavy rain, damaging winds and tornadoes were observed.

Thunderstorm Wind in ST. MARY'S, MARYLAND
From 10-JUN-13 20:18:00 to 10-JUN-13 20:18:00 (EST-5)
Location: CHINGVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.25K
Reported by: Trained Spotter

There were large branches down.

Tornado in BALTIMORE, MARYLAND
From 10-JUN-13 14:24:00 to 10-JUN-13 14:28:00 (EST-5)
Location: FORK
Tornado F-scale: EF0
Property damage: 1.00K
Crop damage: 3.00K
Reported by: NWS Storm Survey

Eyewitness accounts and storm damage survey concluded a small tornado occurred in Fork, MD, from approximately 3:28 to 3:30 PM EDT on June 10, 2013.
About six trees were uprooted in the Mount Vista Estates subdivision of Fork along Vista View Court.  These trees were a mix of hardwood and softwood, some falling at angles of up to 120 degrees from each other.  Several eyewitnesses saw swirling debris within the wind field as the damage was occurring.  Additional tree damage along with damage to a wood fence was located across the street from Fork United Methodist Church on Fork Road, approximately 0.5 miles North of the damage in Mount Vista Estates.  The survey team crossed the path between these two points, as well as up to two miles on either end of the damage, but no further damage could be found.

Tornado in ST. MARY'S, MARYLAND
From 10-JUN-13 20:01:00 to 10-JUN-13 20:02:00 (EST-5)
Location: COLTON
Tornado F-scale: EF0
Property damage: 0.50K
Crop damage: 1.00K
Reported by: NWS Storm Survey

A ground survey conducted by the NWS...together with radar data from Andrews AFB Terminal Doppler Weather Radar determined there was a brief EF-0 tornado touchdown in Coltons Point Maryland.  Minor tree damage and roof damage was noted in the vicinity of the intersection of Colton Point Road...Rt 242 with Bayview Road and along Beach Road between Charles Hall Road and Point Breeze Road.  A few shingles were blown off some structures in this area.  A tree came down on wires in the 38300 block of Beach Road.  A trampoline near a residence on Colton Point Road next to the town post office was lifted up and became lodged 90 feet up in a nearby tall pine tree.  Two large wooden play set were blown...one was dragged about 15 feet.  This tornado was likely the extension of a waterspout that crossed the Potomac River just before 9 pm.

Tornado in BALTIMORE, MARYLAND
From 10-JUN-13 14:44:00 to 10-JUN-13 14:45:00 (EST-5)
Location: SPARROWS PT
Tornado F-scale: EF0
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A metal building structure in the south Locust Point Marine Terminal was damaged when a waterspout over the Patapsco River came onshore, transforming to a small tornado from approximately 3:44 to 3:45 PM EDT on June 10, 2013.
The metal building structure had a portion of its northeast roof peeled up, wrapping it back and folding it over the east-facing side of the building.  Additionally, a small trailer on wheels was demolished as it was propelled to the northwest about 60 feet from its position on Cinder Blocks.  An air conditioning unit which was permanently installed in the wall of an office on the north facing side of the building in proximity to where the roof damage occurred was blown-in.  A large amount of debris was seen plastered to a east-facing chain link fence on the north side of the parking lot.
Areas to the north Marine Terminal were also surveyed, and no further damage was found.