A warm front passed through the area while an upper-level trough approached from the west. A southerly flow behind the front caused an unstable atmosphere, and moderate amounts of instability developed due to colder air aloft ahead of the approaching trough. There was enough instability for some thunderstorms to become severe as a cold front approached from the west.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:18:00 to 30-JUN-15 22:24:00 (EST-5)
Location: LEWISETTA
Magnitude: 39.00 MG
Reported by: Mesonet

LWS reported gusts between 34 and 39 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 30-JUN-15 16:01:00 to 30-JUN-15 16:06:00 (EST-5)
Location: GREENBERRY POINT
Magnitude: 36.00 MG
Reported by: Mesonet

GBY reported gusts between 33 and 36 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 15:48:00 to 30-JUN-15 15:48:00 (EST-5)
Location: LEWISETTA
Magnitude: 38.00 MG
Reported by: Mesonet

LWS reported gusts of 38 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:18:00 to 30-JUN-15 22:24:00 (EST-5)
Location: LEWISETTA
Magnitude: 38.00 MG
Reported by: Mesonet

LWS reported gusts between 34 and 38 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 30-JUN-15 13:30:00 to 30-JUN-15 13:30:00 (EST-5)
Location: SUSQUEHANNA
Magnitude: 41.00 MG
Reported by: Buoy

Susquehanna buoy 44057 reported gusts of 41 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 30-JUN-15 15:36:00 to 30-JUN-15 15:36:00 (EST-5)
Location: COVE POINT
Magnitude: 43.00 MG
Reported by: Mesonet

COVM2 reported gusts of 43 knots.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 30-JUN-15 14:12:00 to 30-JUN-15 14:12:00 (EST-5)
Location: RIVIERA BEACH
Magnitude: 38.00 MG
Reported by: Mesonet

FSKM2 reported gusts of 38 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 30-JUN-15 15:30:00 to 30-JUN-15 15:30:00 (EST-5)
Location: SUSQUEHANNA
Magnitude: 41.00 MG
Reported by: Buoy

Susquehanna buoy 44057 reported gusts of 41 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 15:48:00 to 30-JUN-15 15:48:00 (EST-5)
Location: LEWISETTA
Magnitude: 38.00 MG
Reported by: Mesonet

LWTV2 reported gusts of 38 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 30-JUN-15 15:47:00 to 30-JUN-15 16:02:00 (EST-5)
Location: TOLLY POINT
Magnitude: 41.00 MG
Reported by: Mesonet

TOL reported gusts between 38 and 41 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 30-JUN-15 16:00:00 to 30-JUN-15 16:00:00 (EST-5)
Location: KENT ISLAND
Magnitude: 34.00 EG
Reported by: Mesonet

KNT reported gusts between 31 and 34 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 30-JUN-15 16:00:00 to 30-JUN-15 16:10:00 (EST-5)
Location: ANNAPOLIS BUOY
Magnitude: 34.00 EG
Reported by: Buoy

Annapolis buoy 44063 reported gusts between 31 and 33 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:35:00 to 30-JUN-15 23:00:00 (EST-5)
Location: POINT LOOKOUT
Magnitude: 38.00 MG
Reported by: Mesonet

PTL reported gusts between 33 and 38 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:36:00 to 30-JUN-15 22:48:00 (EST-5)
Location: POINT LOOKOUT
Magnitude: 34.00 EG
Reported by: Mesonet

PPTM2 reported gusts between 31 and 34 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:37:00 to 30-JUN-15 22:37:00 (EST-5)
Location: PINEY POINT
Magnitude: 34.00 EG
Reported by: AWOS

KNUI reported gusts between 31 and 34 knots.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 30-JUN-15 22:39:00 to 30-JUN-15 22:59:00 (EST-5)
Location: CRISFIELD
Magnitude: 42.00 MG
Reported by: Mesonet

CRS reported gusts between 33 and 42 knots.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 30-JUN-15 22:42:00 to 30-JUN-15 23:00:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 39.00 MG
Reported by: Mesonet

BISM2 reported gusts between 31 and 39 knots.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 30-JUN-15 22:47:00 to 30-JUN-15 22:47:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 34.00 MG
Reported by: Mesonet

BHD reported gusts of 34 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:44:00 to 30-JUN-15 22:44:00 (EST-5)
Location: SMITH ISLAND
Magnitude: 34.00 MG
Reported by: Mesonet

SIS reported gusts of 34 knots.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 30-JUN-15 22:45:00 to 30-JUN-15 22:45:00 (EST-5)
Location: PATUXENT RIVER ASOS
Magnitude: 34.00 EG
Reported by: ASOS

KNHK reported gusts between 31 and 34 knots.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 30-JUN-15 22:54:00 to 30-JUN-15 22:54:00 (EST-5)
Location: RACCOON POINT
Magnitude: 34.00 EG
Reported by: Mesonet

RAC reported gusts between 31 and 34 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 30-JUN-15 23:00:00 to 30-JUN-15 23:00:00 (EST-5)
Location: CUCKOLD CREEK
Magnitude: 38.00 MG
Reported by: Mesonet

CCK reported gusts of 38 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 30-JUN-15 23:19:00 to 30-JUN-15 23:19:00 (EST-5)
Location: QUANTICO
Magnitude: 42.00 MG
Reported by: ASOS

KNYG reported gusts of 42 knots.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 30-JUN-15 23:41:00 to 30-JUN-15 23:41:00 (EST-5)
Location: FORT BELVOIR
Magnitude: 50.00 MG
Reported by: Mesonet

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 30-JUN-15 23:58:00 to 30-JUN-15 23:59:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 44.00 MG
Reported by: ASOS

KDCA reported gusts between 42 and 44 kts.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 30-JUN-15 23:00:00 to 30-JUN-15 23:00:00 (EST-5)
Location: COVE POINT
Magnitude: 34.00 EG
Reported by: Mesonet

COVM2 reported gusts between 33 and 34 knots.