A squall line in advance of an east-ward moving cold front in the southeast Gulf of Mexico swept through the Florida Keys.  The squall line produced widespread gale-force wind gusts in as it moved from Dry Tortugas National Park during the late afternoon hours of April 15th, to Key West after sunset, and later through the upper Keys within two hours.

Marine Thunderstorm Wind in GULF OF MEXICO INCLUDING DRY TORTUGAS AND REBECCA SHOAL CHANNEL, GULF OF MEXICO
From 15-APR-18 15:55:00 to 15-APR-18 15:55:00 (EST-5)
Location: DRY TORTUGAS LIGHT
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 38 knots from the west-northwest was measured at Pulaski Shoal Light.

Marine Thunderstorm Wind in GULF OF MEXICO INCLUDING DRY TORTUGAS AND REBECCA SHOAL CHANNEL, GULF OF MEXICO
From 15-APR-18 16:18:00 to 15-APR-18 16:18:00 (EST-5)
Location: DRY TORTUGAS LIGHT
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A wind gust of 47 knots was measured at Pulaski Shoal Light.

Marine Thunderstorm Wind in GULF OF MEXICO FROM EAST CAPE SABLE TO CHOKOLOSKEE 20 TO 60 NM OUT AND BEYOND 5 FATHOMS, GULF OF MEXICO
From 15-APR-18 18:06:00 to 15-APR-18 18:06:00 (EST-5)
Location: SMITH SHOAL LIGHT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 54 knots was measured at an automated WeatherFlow station at Smith 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 15-APR-18 18:41:00 to 15-APR-18 18:41:00 (EST-5)
Location: KEY WEST
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 WeatherFlow station at the U.S. Coast Guard Station Key West.

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 15-APR-18 18:42:00 to 15-APR-18 18:42:00 (EST-5)
Location: KEY WEST
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A wind gust of 36 knots was measured at an automated National Ocean Service station at the Florida Keys National Marine Sanctuary office in Key West.

Marine Thunderstorm Wind in HAWK CHANNEL FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO THE REEF, GULF OF MEXICO
From 15-APR-18 18:46:00 to 15-APR-18 18:46:00 (EST-5)
Location: KEY WEST
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 38 knots was measured at Key West International Airport.

Marine Thunderstorm Wind in HAWK CHANNEL FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO THE REEF, GULF OF MEXICO
From 15-APR-18 18:55:00 to 15-APR-18 18:55:00 (EST-5)
Location: KEY WEST
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A second wind gust of 38 knots was measured at Key West International Airport.

Marine Thunderstorm Wind in HAWK CHANNEL FROM WEST END OF SEVEN MILE BRIDGE TO HALFMOON SHOAL OUT TO THE REEF, GULF OF MEXICO
From 15-APR-18 18:57:00 to 15-APR-18 18:57:00 (EST-5)
Location: BIG COPPITT KEY
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 Naval Air Station Key West Boca Chica Field.

Marine Thunderstorm Wind in FLORIDA BAY INCLUDING BARNES SOUND, BLACKWATER SOUND, AND BUTTONWOOD SOUND, GULF OF MEXICO
From 15-APR-18 19:52:00 to 15-APR-18 19:52:00 (EST-5)
Location: PLANTATION KEY
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 WeatherFlow station on Upper Matecumbe Key.