Strong thunderstorms developed in the afternoon hours within a very unstable environment and a sharp surface trough. These thunderstorms pushed toward the coast and produced very strong wind gusts along area beaches and the adjacent coastal waters.

Marine Thunderstorm Wind in South Santee River to Edisto Beach SC out 20nm, ATLANTIC SOUTH
From 21-JUL-15 14:00:00 to 21-JUL-15 14:01:00 (EST-5)
Location: ISLE OF PALMS
Magnitude: 37.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site on the Isle of Palms pier measured a 37 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in South Santee River to Edisto Beach SC out 20nm, ATLANTIC SOUTH
From 21-JUL-15 14:27:00 to 21-JUL-15 14:35:00 (EST-5)
Location: FOLLY BEACH
Magnitude: 36.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site at the Folly Beach pier measured a 36 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in Charleston Harbor, ATLANTIC SOUTH
From 21-JUL-15 14:33:00 to 21-JUL-15 14:50:00 (EST-5)
Location: FORT SUMTER
Magnitude: 35.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow Site at Fort Sumter measured a 35 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in Charleston Harbor, ATLANTIC SOUTH
From 21-JUL-15 14:53:00 to 21-JUL-15 14:55:00 (EST-5)
Location: FORT SUMTER
Magnitude: 56.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site at Fort Sumter measured a 56 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in South Santee River to Edisto Beach SC out 20nm, ATLANTIC SOUTH
From 21-JUL-15 14:57:00 to 21-JUL-15 14:59:00 (EST-5)
Location: SULLIVANS ISLAND
Magnitude: 56.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site at Station 28.5 on Sullivan's Island measured a 56 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in South Santee River to Edisto Beach SC out 20nm, ATLANTIC SOUTH
From 21-JUL-15 14:55:00 to 21-JUL-15 15:03:00 (EST-5)
Location: ISLE OF PALMS
Magnitude: 42.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site on the Isle of Palms pier measured a 42 knot wind gust with a passing thunderstorm. A peak wind gust of 62 knots occurred 5 minutes later.

Marine Thunderstorm Wind in Savannah GA to Altamaha Sound GA out 20nm, ATLANTIC SOUTH
From 21-JUL-15 15:32:00 to 21-JUL-15 15:34:00 (EST-5)
Location: GRAYS REEF BUOY (41008)
Magnitude: 39.00 MG
Crop damage: 0.00K
Reported by: Buoy

Buoy 41008 measured a 39 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in Savannah GA to Altamaha Sound GA out 20nm, ATLANTIC SOUTH
From 21-JUL-15 17:34:00 to 21-JUL-15 17:35:00 (EST-5)
Location: ALTAMAHA SOUND
Magnitude: 35.00 MG
Crop damage: 0.00K
Reported by: Other Federal Agency

The National Estuarine Research Reserve System site at Sapelo Island measured a 35 knot wind gust with a passing thunderstorm.

Marine Thunderstorm Wind in South Santee River to Edisto Beach SC out 20nm, ATLANTIC SOUTH
From 21-JUL-15 14:54:00 to 21-JUL-15 14:56:00 (EST-5)
Location: SULLIVANS ISLAND
Magnitude: 53.00 MG
Crop damage: 0.00K
Reported by: Mesonet

A 53 knot wind gust was measured at the Sullivan's Island Fire Department with a passing thunderstorm.