A squall line preceding a cold front passed southeast through the Florida Keys.  Widespread gale-force wind gusts were measured throughout the island chain and surrounding coastal waters.  The U.S. Coast Guard reported 15 responses to distressed boaters in a two-hour period, including two damaged vessels.

Marine Thunderstorm Wind in CRAIG KEY TO THE W END OF THE 7 MILE BRIDGE OUT 20NM, GULF OF MEXICO
From 10-MAR-11 14:00:00 to 10-MAR-11 14:00:00 (EST-5)
Location: MARATHON
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 35 knots (40 mph) was measured at Sombrero Key Light.

Marine Thunderstorm Wind in GULF SIDE OF THE LOWER KEYS OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:38:00 to 10-MAR-11 12:38:00 (EST-5)
Location: BIG PINE KEY
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

A wind gust of 37 knots (43 mph) was measured on north Big Pine Key.

Marine Thunderstorm Wind in GULF SIDE OF THE LOWER KEYS OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:55:00 to 10-MAR-11 12:55:00 (EST-5)
Location: KEY WEST
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 47 knots (54 mph) was measured at an automated Weatherflow sensor at the U.S. Coast Guard Sector Key West Station.

Marine Thunderstorm Wind in KEY W TO DRY TORTUGAS WATERS, GULF OF MEXICO
From 10-MAR-11 13:01:00 to 10-MAR-11 13:01:00 (EST-5)
Location: DRY TORTUGAS
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 37 knots (43 mph) was measured at Pulaski Shoal Light.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 13:02:00 to 10-MAR-11 13:02:00 (EST-5)
Location: DUCK KEY
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 42 knots (48 mph) was measured at Long Key Light.

Marine Thunderstorm Wind in CRAIG KEY TO THE W END OF THE 7 MILE BRIDGE OUT 20NM, GULF OF MEXICO
From 10-MAR-11 13:05:00 to 10-MAR-11 13:05:00 (EST-5)
Location: MARATHON
Magnitude: 48.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 48 knots (55 mph) was measured at Sombrero Key Light.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 12:56:00 to 10-MAR-11 12:56:00 (EST-5)
Location: MARATHON
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 38 knots (44 mph) was measured at the Marathon Airport.

Marine Thunderstorm Wind in KEY W TO DRY TORTUGAS WATERS, GULF OF MEXICO
From 10-MAR-11 12:44:00 to 10-MAR-11 12:44:00 (EST-5)
Location: KEY WEST
Magnitude: 48.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 48 knots (55 mph) was measured at Sand Key Light.

Marine Thunderstorm Wind in W END OF THE 7 MILE BRIDGE TO KEY W OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:45:00 to 10-MAR-11 12:45:00 (EST-5)
Location: KEY WEST
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 40 knots (46 mph) was measured at Key West International Airport.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 12:47:00 to 10-MAR-11 12:47:00 (EST-5)
Location: DUCK KEY
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 38 knots (44 mph) was measured at Long Key Light.

Marine Thunderstorm Wind in GULF SIDE OF THE LOWER KEYS OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:51:00 to 10-MAR-11 12:51:00 (EST-5)
Location: KEY WEST
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mariner

A wind gust of 43 knots (49 mph) was measured at an automated station at the Big Coppitt Key Fire Station.

Marine Thunderstorm Wind in W END OF THE 7 MILE BRIDGE TO KEY W OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:53:00 to 10-MAR-11 12:53:00 (EST-5)
Location: KEY WEST
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 40 knots (46 mph) was measured at Naval Air Station Key West on Boca Chica Key.

Marine Thunderstorm Wind in W END OF THE 7 MILE BRIDGE TO KEY W OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:58:00 to 10-MAR-11 12:58:00 (EST-5)
Location: KEY WEST
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A wind gust of 37 knots (43 mph) was measured at the Weather Forecast Office Key West.

Marine Thunderstorm Wind in KEY W TO DRY TORTUGAS WATERS, GULF OF MEXICO
From 10-MAR-11 11:42:00 to 10-MAR-11 11:42:00 (EST-5)
Location: DRY TORTUGAS
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 42 knots (48 mph) was measured at Pulaski Shoal Light.

Marine Thunderstorm Wind in KEY W TO DRY TORTUGAS WATERS, GULF OF MEXICO
From 10-MAR-11 11:30:00 to 10-MAR-11 11:30:00 (EST-5)
Location: KEY WEST
Magnitude: 40.00 EG
Crop damage: 0.00K
Reported by: Coast Guard

A 40-foot catamaran with 31 people on board ran aground and took on water near Cottrell Key.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 13:00:00 to 10-MAR-11 13:00:00 (EST-5)
Location: ISLAMORADA
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 34 knots (39 mph) was measured at an automated Weatherflow sensor on Upper Matecumbe Key.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 13:00:00 to 10-MAR-11 13:00:00 (EST-5)
Location: DUCK KEY
Magnitude: 40.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Coast Guard

A sailing vessel with 4 persons on board lost propulsion and drifted into the Channel Five Bridge.

Marine Thunderstorm Wind in KEY W TO DRY TORTUGAS WATERS, GULF OF MEXICO
From 10-MAR-11 13:00:00 to 10-MAR-11 13:00:00 (EST-5)
Location: KEY WEST
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 37 knots (43 mph) was measured at Sand Key Light.

Marine Thunderstorm Wind in OCEAN REEF TO CRAIG KEY FL OUT 20NM, GULF OF MEXICO
From 10-MAR-11 13:08:00 to 10-MAR-11 13:08:00 (EST-5)
Location: KEY LARGO
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 41 knots (47 mph)was measured at Molasses Reef Light.

Marine Thunderstorm Wind in CRAIG KEY TO THE W END OF THE 7 MILE BRIDGE OUT 20NM, GULF OF MEXICO
From 10-MAR-11 13:10:00 to 10-MAR-11 13:10:00 (EST-5)
Location: MARATHON
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 46 knots (53 mph) was measured at Sombrero Key Light.

Marine Thunderstorm Wind in FLORIDA BAY, GULF OF MEXICO
From 10-MAR-11 13:26:00 to 10-MAR-11 13:26:00 (EST-5)
Location: DUCK KEY
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 37 knots (43 mph) was measured at Long Key Light.

Marine Thunderstorm Wind in W END OF THE 7 MILE BRIDGE TO KEY W OUT 20NM, GULF OF MEXICO
From 10-MAR-11 12:31:00 to 10-MAR-11 12:31:00 (EST-5)
Location: BIG PINE KEY
Magnitude: 43.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 43 knots (49 mph) was measured at an automated station on Cudjoe Key near the south end of Cudjoe Bay.