High pressure was anchored off shore while low pressure spun over the Great Lakes. A shortwave trough moved over the region initiating showers and thunderstorms in vicinity of a surface trough.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 28-JUN-13 14:36:00 to 28-JUN-13 14:48:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind gusts of 46 knots were measured at Reagan National Airport.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 28-JUN-13 17:00:00 to 28-JUN-13 17:00:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts in excess of 32 knots were measured at Thomas Point Lighthouse.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 28-JUN-13 18:48:00 to 28-JUN-13 18:53:00 (EST-5)
Location: CRISFIELD
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts in excess of 32 knots were measured at Crisfield(CRS).

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 28-JUN-13 18:40:00 to 28-JUN-13 18:50:00 (EST-5)
Location: GREENBERRY POINT
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Wind gusts of 37 knots were measured at Annapolis Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 28-JUN-13 19:00:00 to 28-JUN-13 19:00:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Wind gusts of 41 knots were measured at Gooses Reef.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 28-JUN-13 14:50:00 to 28-JUN-13 14:50:00 (EST-5)
Location: LYLES-CROUCH ACADEMY ALEXANDRIA
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

Wind gusts in excess of 31 knots were reported at Upper Potomac Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 28-JUN-13 16:00:00 to 28-JUN-13 16:00:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts in excess of 31 knots were measured at Thomas Point Lighthouse.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 28-JUN-13 16:10:00 to 28-JUN-13 16:10:00 (EST-5)
Location: MONROE CREEK
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts in excess of 31 knots were measured at Monroe Creek.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 28-JUN-13 17:01:00 to 28-JUN-13 17:01:00 (EST-5)
Location: LOWER HOOPERS ISLAND
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts of 36 knots were measured at Lower Hooper Island.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 28-JUN-13 17:19:00 to 28-JUN-13 17:36:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts of 50 knots were measured at Bishops Head(BHD).

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 28-JUN-13 19:12:00 to 28-JUN-13 19:18:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts of 38 knots were measured at Cambridge(CAMM2).

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 28-JUN-13 19:12:00 to 28-JUN-13 19:12:00 (EST-5)
Location: COVE POINT
Magnitude: 34.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gusts in excess of 32 knots were measured at Cove Point.