A cold front approached the waters on the 9th. Ahead of the front, warm and humid air led to unstable conditions. The instability combined with the boundary and an upper-level disturbance to trigger showers and thunderstorms on the afternoon and evening hours of the 9th. Some thunderstorms became severe, producing large hail and gusty winds.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 09-JUN-09 16:35:00 to 09-JUN-09 16:35:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 50.00 EG
Reported by: Trained Spotter

A wind gust of 50 knots was estimated about five miles west-southwest of Annapolis.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 09-JUN-09 16:47:00 to 09-JUN-09 16:55:00 (EST-5)
Location: KENT ISLAND
Magnitude: 46.00 MG
Reported by: Mesonet

Wind gusts from 35 knots to 46 knots were reported at Kent Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 09-JUN-09 17:27:00 to 09-JUN-09 17:27:00 (EST-5)
Location: STEVENSVILLE
Magnitude: 35.00 MG
Reported by: Mesonet

Wind gusts of 35 knots was measured at Sandy Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 09-JUN-09 16:49:00 to 09-JUN-09 17:20:00 (EST-5)
Location: MILLERS ISLAND
Magnitude: 41.00 MG
Reported by: Mesonet

Wind gusts ranged from 35 to 41 knots at Miller Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 18:56:00 to 09-JUN-09 18:56:00 (EST-5)
Location: CRISFIELD
Magnitude: 37.00 MG
Reported by: Mesonet

A wind gust of 37 knots was reported at Crisfield.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 09-JUN-09 16:31:00 to 09-JUN-09 16:31:00 (EST-5)
Location: MARTIN STATE AIRPORT
Magnitude: 34.00 EG
Reported by: ASOS

A wind gust in excess of 30 knots was reported at Martin State.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 17:54:00 to 09-JUN-09 17:54:00 (EST-5)
Location: CHESAPEAKE BIOLOGICAL LABORATORY
Magnitude: 34.00 EG
Reported by: Buoy

A wind gust in excess of 30 knots was reported at Solomons Island.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 09-JUN-09 17:05:00 to 09-JUN-09 17:05:00 (EST-5)
Location: QUANTICO
Magnitude: 34.00 MG
Reported by: ASOS

A wind gust of 34 knots was reported at Quantico.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 09-JUN-09 16:29:00 to 09-JUN-09 16:29:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 36.00 MG
Reported by: ASOS

A wind gust of 34 knots was measured at Reagan National.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 18:18:00 to 09-JUN-09 18:18:00 (EST-5)
Location: LEWISETTA
Magnitude: 39.00 MG
Reported by: Buoy

A wind gust of 39 knots was measured at Lewisetta.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 17:49:00 to 09-JUN-09 17:49:00 (EST-5)
Location: PATUXENT RIVER NAS
Magnitude: 34.00 MG
Reported by: ASOS

A wind gust of 34 knots was measured at Patuxent River.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 18:15:00 to 09-JUN-09 18:22:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 38.00 MG
Reported by: Buoy

Wind gusts of 37 to 38 knots were measured at Bishops Head.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 09-JUN-09 18:05:00 to 09-JUN-09 18:05:00 (EST-5)
Location: LOWER HOOPERS ISLAND
Magnitude: 35.00 MG
Reported by: Mesonet

A wind gust of 35 knots was measured at Lower Hooper Island.

Marine Hail in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 09-JUN-09 16:43:00 to 09-JUN-09 16:43:00 (EST-5)
Location: MARTIN STATE AIRPORT
Magnitude: 0.75 
Reported by: Trained Spotter

Penny size hail was reported near Magnolia.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 09-JUN-09 16:47:00 to 09-JUN-09 16:47:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 36.00 MG
Reported by: ASOS

A wind gust of 36 knots was reported at Annapolis.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 09-JUN-09 17:30:00 to 09-JUN-09 17:30:00 (EST-5)
Location: COVE POINT
Magnitude: 38.00 MG
Reported by: Buoy

A wind gust of 38 knots was measured at Cove Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 09-JUN-09 16:48:00 to 09-JUN-09 16:48:00 (EST-5)
Location: GUNPOWDER FALLS STATE PARK
Magnitude: 37.00 MG
Reported by: Mesonet

A wind gust of 37 knots was reported at GunPowder Falls State Park.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 09-JUN-09 05:17:00 to 09-JUN-09 05:17:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 36.00 MG
Reported by: ASOS

A wind gust of 36 knots was reported at Reagan National.