An upper-level low produced an unstable atmosphere, triggering showers and thunderstorms. Some of the thunderstorms produced gusty winds over the Chesapeake Bay.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-08 16:59:00 to 14-AUG-08 16:59:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 EG
Reported by: C-MAN Station

A wind gust in excess of 30 knots was estimated at Thomas Point Lighthouse.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 14-AUG-08 18:40:00 to 14-AUG-08 18:40:00 (EST-5)
Location: HAVRE DE GRACE
Magnitude: 50.00 EG
Reported by: Emergency Manager

Powerlines were knocked down near the coast from thunderstorm winds.

Marine Hail in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-08 16:26:00 to 14-AUG-08 16:26:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail to the size of pennies was reported near the coast around Churchton.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-AUG-08 15:06:00 to 14-AUG-08 15:06:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 39.00 MG
Reported by: ASOS

A thunderstorm produced a wind gust of 39 knots at Reagan National Airport.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-AUG-08 14:57:00 to 14-AUG-08 15:06:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 38.00 MG
Reported by: ASOS

A wind gust of 38 knots was reported at Reagan National Airport.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-AUG-08 15:12:00 to 14-AUG-08 15:12:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported near Reagan National.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-AUG-08 15:14:00 to 14-AUG-08 15:14:00 (EST-5)
Location: RONALD REAGAN NATL ARPT
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Nationals Park.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-08 16:36:00 to 14-AUG-08 16:36:00 (EST-5)
Location: TOLLY POINT
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Tolly Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-08 16:37:00 to 14-AUG-08 16:37:00 (EST-5)
Location: STEVENSVILLE
Magnitude: 34.00 EG
Reported by: Mesonet

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

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-08 19:26:00 to 14-AUG-08 19:26:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 42.00 MG
Reported by: Mesonet

A wind gust of 42 knots was reported at Bishops Head.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-08 19:46:00 to 14-AUG-08 19:46:00 (EST-5)
Location: RACCOON POINT
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Raccoon Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-08 21:09:00 to 14-AUG-08 21:09:00 (EST-5)
Location: POINT LOOKOUT
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Point Lookout.

Marine Hail in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-08 16:26:00 to 14-AUG-08 16:26:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail to the size of quarters was reported near the coast.