Convection developed across the Piedmont of North Carolina during the afternoon hours of July 1st. The storms formed into a line of severe thunderstorms similar to a derecho which caused numerous marine thunderstorm wind gusts over 40 knots and capsized vessels in the Pamlico River near Washington.

Marine Thunderstorm Wind in CP LOOKOUT TO SURF CITY NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 16:55:00 to 01-JUL-12 16:55:00 (EST-5)
Location: BEAUFORT INLET
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Beaufort ASOS (KMRH) observed a 46 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in CP HATTERAS TO OCRACOKE INLET NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 15:50:00 to 01-JUL-12 15:50:00 (EST-5)
Location: HATTERAS INLET
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

NDBC Diamond Shoals buoy (41025) reported a 35 knot marine thunderstorm wind gust.

Marine Hail in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 14:59:00 to 01-JUL-12 14:59:00 (EST-5)
Location: CEDAR ISLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Cedar Island ferry terminal reported hail the size of quarters.

Marine Thunderstorm Wind in CP LOOKOUT TO SURF CITY NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 17:00:00 to 01-JUL-12 17:00:00 (EST-5)
Location: HARKERS ISLAND
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Cape Lookout C-Man station reported a 39 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 14:30:00 to 01-JUL-12 14:30:00 (EST-5)
Location: CEDAR ISLAND
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Piney Island Bombing Range (KNBT) reported a 37 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 14:45:00 to 01-JUL-12 14:45:00 (EST-5)
Location: OCRACOKE
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

WeatherFlow sensor at Ocracoke Ferry terminal reported a 41 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in OREGON INLET TO CP HATTERAS NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 15:57:00 to 01-JUL-12 15:57:00 (EST-5)
Location: BUXTON
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

WeatherFlow sensor on Avon Pier reported a 39 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in ALBEMARLE SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:10:00 to 01-JUL-12 16:10:00 (EST-5)
Location: COLUMBIA
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

WeatherFlow sensor on Alligator River Bridge observed a 41 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:15:00 to 01-JUL-12 16:15:00 (EST-5)
Location: HOBUCKEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Coast Guard

U.S. Coast Guard relayed reports of 10 to 12 vessels capsized in the Pamlico River near Washington due to marine thunderstorm wind gusts.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:20:00 to 01-JUL-12 16:20:00 (EST-5)
Location: SWANQUARTER
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

National Weather Service local marine platform in Swan Quarter reported a 40 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:30:00 to 01-JUL-12 16:30:00 (EST-5)
Location: ORIENTAL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Media relayed report of Minnesott Beach ferry run aground due to strong thunderstorm winds.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:37:00 to 01-JUL-12 16:37:00 (EST-5)
Location: CEDAR ISLAND
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Piney Island Bombing Range (KNBT) reported a 46 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 17:06:00 to 01-JUL-12 17:06:00 (EST-5)
Location: OCRACOKE
Magnitude: 45.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

National Ocean Service tide gauge at Hatteras Coast Guard station reported a 45 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in CP LOOKOUT TO SURF CITY NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 16:48:00 to 01-JUL-12 16:48:00 (EST-5)
Location: NORTH TOPSAIL BEACH
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesowest station in Sneads Ferry reported a 46 knot thunderstorm gust.

Marine Thunderstorm Wind in CP HATTERAS TO OCRACOKE INLET NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 16:50:00 to 01-JUL-12 16:50:00 (EST-5)
Location: HATTERAS INLET
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Buoy

NDBC Diamond Shoals buoy (41025) reported a 37 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in CP LOOKOUT TO SURF CITY NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 16:50:00 to 01-JUL-12 16:50:00 (EST-5)
Location: BOGUE INLET
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Coast Guard

U.S. Coast Guard relayed a report of boats pushed ashore near Emerald Isle due to strong winds.

Marine Thunderstorm Wind in CP LOOKOUT TO SURF CITY NC OUT 20NM, ATLANTIC SOUTH
From 01-JUL-12 16:59:00 to 01-JUL-12 16:59:00 (EST-5)
Location: BEAUFORT INLET
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

WeatherFlow sensor at Fort Macon observed a 46 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 15:15:00 to 01-JUL-12 15:15:00 (EST-5)
Location: OCRACOKE
Magnitude: 45.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

WeatherFlow sensor at Ocracoke reported a 45 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 16:50:00 to 01-JUL-12 16:50:00 (EST-5)
Location: CEDAR ISLAND
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

National Weather Service local marine platform in Cedar Island reported a 43 knot marine thunderstorm wind gust.

Marine Thunderstorm Wind in PAMLICO SOUND, ATLANTIC SOUTH
From 01-JUL-12 14:50:00 to 01-JUL-12 14:50:00 (EST-5)
Location: CEDAR ISLAND
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

National Weather Service local marine platform at Cedar Island observed a 44 knot marine thunderstorm wind gust.