Numerous thunderstorms propagating on outflow boundaries swept through the Florida Keys and adjacent coastal waters, producing widespread gale-force and isolated storm-force wind gusts.  A large waterspout was also observed south of the Lower Florida Keys.  The thunderstorms developed in advance of a shortwave upper level trough ejected northeast from a stationary longwave upper trough over the western Gulf of Mexico.

Marine Thunderstorm Wind in GULF OF MEXICO INCLUDING DRY TORTUGAS AND REBECCA SHOAL CHANNEL, GULF OF MEXICO
From 27-AUG-15 04:13:00 to 27-AUG-15 04:13:00 (EST-5)
Location: DRY TORTUGAS LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 35 knots was measured at Pulaski Shoal Light.

Marine Thunderstorm Wind in GULF OF MEXICO FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO 5 FATHOMS, GULF OF MEXICO
From 27-AUG-15 06:12:00 to 27-AUG-15 06:12:00 (EST-5)
Location: SMITH SHOAL LIGHT
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 34 knots was measured by an automated WeatherFlow station at Smith Shoal Light.

Marine Thunderstorm Wind in HAWK CHANNEL FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE OUT TO THE REEF, GULF OF MEXICO
From 27-AUG-15 08:14:00 to 27-AUG-15 08:14:00 (EST-5)
Location: DUCK KEY
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 38 knots was measured at an automated WeatherFlow station on Crawl Key.

Marine Thunderstorm Wind in BAYSIDE AND GULFSIDE FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE, GULF OF MEXICO
From 27-AUG-15 08:19:00 to 27-AUG-15 08:19:00 (EST-5)
Location: LAYTON
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 52 knots was measured at Long Key Light.

Waterspout in HAWK CHANNEL FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO THE REEF, GULF OF MEXICO
From 27-AUG-15 11:46:00 to 27-AUG-15 11:46:00 (EST-5)
Location: KEY WEST
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A large waterspout was observed by a Naval Air Station Key West weather observer about 5 miles southwest of Boca Chica Field.

Marine Thunderstorm Wind in GULF OF MEXICO FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO 5 FATHOMS, GULF OF MEXICO
From 27-AUG-15 06:24:00 to 27-AUG-15 06:24:00 (EST-5)
Location: FLAMINGO
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 35 knots was measured at an automated University of South Florida COMPS station in northwest Florida Bay.

Marine Thunderstorm Wind in HAWK CHANNEL FROM OCEAN REEF TO CRAIG KEY OUT TO THE REEF, GULF OF MEXICO
From 27-AUG-15 06:53:00 to 27-AUG-15 06:53:00 (EST-5)
Location: MOLASSES REEF LIGHT
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 35 knots was measured at Molasses Reef Light.

Marine Thunderstorm Wind in BAYSIDE AND GULFSIDE FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE, GULF OF MEXICO
From 27-AUG-15 08:04:00 to 27-AUG-15 08:04:00 (EST-5)
Location: MARATHON
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 37 knots was measured at the Florida Keys Marathon Airport.

Marine Thunderstorm Wind in BAYSIDE AND GULFSIDE FROM CRAIG KEY TO WEST END OF SEVEN MILE BRIDGE, GULF OF MEXICO
From 27-AUG-15 08:11:00 to 27-AUG-15 08:11:00 (EST-5)
Location: MARATHON
Magnitude: 49.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 49 knots was measured at an automated Citizen Weather Observing Program station near the bayside of Marathon, northwest of the Florida Keys Marathon Airport.