A well-defined upper level disturbance moved west from the Bahamas to across South Florida on August 25th and 26th, helping to trigger several periods of strong thunderstorms over the Atlantic waters which spread west over the local waters, then over South Florida and the Gulf of Mexico waters at several times during this period.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:00:00 to 25-AUG-21 05:00:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A thunderstorm wind gust of 37 knots (43 mph) was recorded at C-MAN station FWYF1 Fowey Rocks. Anemometer height is 144 feet.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:11:00 to 25-AUG-21 05:11:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 49.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 49 knots (57 mph) was recorded at the WeatherSTEM site at the University of Miami Rosenstiel School. The anemometer is elevated on the roof of the building.

Marine Thunderstorm Wind in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 25-AUG-21 05:05:00 to 25-AUG-21 05:05:00 (EST-5)
Location: GOVERNMENT CUT
Magnitude: 45.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 45 knots (52 mph) was recorded at the WxFlow site XGVT, Government Cut. The anemometer height is 75 feet.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:12:00 to 25-AUG-21 05:17:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 42.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 42 knots (48 mph) was recorded at the WxFlow site XDIN, Dinner Key Light.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:12:00 to 25-AUG-21 05:12:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A thunderstorm wind gust of 37 knots (43 mph) was recorded at NOS site VAKF1 on Virginia Key. Height of the anemometer is 20 feet.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:10:00 to 25-AUG-21 05:10:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 34 knots (39 mph) was recorded at the WxFlow site XDGE at the Biscayne Bay Harbor Pilots on Dodge Island. The anemometer height is 40 feet.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:26:00 to 25-AUG-21 05:26:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 36 knots (41 mph) was recorded at the WxFlow site XKBS, Biscayne Bay Light.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 05:19:00 to 25-AUG-21 05:19:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 34.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 34 knots (39 mph) was recorded at the WxFlow site XSOM located in Palmetto Bay.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 09:18:00 to 25-AUG-21 09:18:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A downburst-originated wind gust of 36 knots (42 mph) was recorded at NOS site VAKF1 at Virginia Key. The downbursts propagated towards the coast from thunderstorms well offshore.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 09:32:00 to 25-AUG-21 09:32:00 (EST-5)
Location: BOCA RATON
Magnitude: 35.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A downburst-originated wind gust of 36 knots (42 mph) was recorded at Earth Networks site BYNBC, Boynton Beach Fire Rescue. The downbursts propagated towards the coast from thunderstorms well offshore.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 09:30:00 to 25-AUG-21 09:30:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A downburst-originated wind gust of 41 knots (47 mph) was recorded at NOAA C-MAN station LKWF1 at Lake Worth Pier. The downbursts propagated towards the coast from thunderstorms well offshore.

Marine Thunderstorm Wind in BISCAYNE BAY, ATLANTIC SOUTH
From 25-AUG-21 09:19:00 to 25-AUG-21 09:19:00 (EST-5)
Location: KEY BISCAYNE
Magnitude: 38.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A downburst-originated wind gust of 38 knots (44 mph) was recorded at WxFlow site XMSP located at Morningside Park. The downbursts propagated towards the coast from thunderstorms well offshore.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 09:31:00 to 25-AUG-21 09:31:00 (EST-5)
Location: PORT OF PALM BEACH
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A downburst-originated wind gust of 37 knots (43 mph) was recorded at WxFlow site XBOY. The downbursts propagated towards the coast from thunderstorms well offshore.

Marine Thunderstorm Wind in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 25-AUG-21 09:20:00 to 25-AUG-21 09:20:00 (EST-5)
Location: PORT EVERGLADES
Magnitude: 35.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A kitesurfer died as a result of injuries suffered after being blown off course by gusty winds from thunderstorm outflow/downburst winds. The kitesurfer was launched by the winds into a beachfront condo building near Loggerhead Park on Fort Lauderdale Beach. He was taken to a nearby hospital where he died shortly afterwards.
Time was taken from a surveillance camera which captured the incident.

Marine Thunderstorm Wind in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 25-AUG-21 17:15:00 to 25-AUG-21 17:15:00 (EST-5)
Location: GOVERNMENT CUT
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 47 knots (54 mph) was recorded by WxFlow site XGVT, Government Cut. Anemometer height is 75 feet.

Marine Thunderstorm Wind in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 25-AUG-21 18:48:00 to 25-AUG-21 18:48:00 (EST-5)
Location: PORT EVERGLADES
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A thunderstorm wind gust of 37 knots (43 mph) was recorded by NOS site PEGF1 near Port Everglades.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 20:11:00 to 25-AUG-21 20:11:00 (EST-5)
Location: JUPITER INLET
Magnitude: 39.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 39 knots (45 mph) was recorded by WxFlow site XJUP located at Juno Beach Pier.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 20:16:00 to 25-AUG-21 20:16:00 (EST-5)
Location: PORT OF PALM BEACH
Magnitude: 41.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 41 knots (47 mph) was recorded by WxFlow site XBOY, Boynton Beach.

Marine Thunderstorm Wind in JUPITER INLET TO DEERFIELD BEACH FL OUT 20NM, ATLANTIC SOUTH
From 25-AUG-21 20:18:00 to 25-AUG-21 20:18:00 (EST-5)
Location: PORT OF PALM BEACH
Magnitude: 40.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

A thunderstorm wind gust of 40 knots (46 mph) was recorded by C-MAN station LKWF1 at Lake Worth Pier.

Marine Thunderstorm Wind in DEERFIELD BEACH TO OCEAN REEF FL, ATLANTIC SOUTH
From 25-AUG-21 21:34:00 to 25-AUG-21 21:34:00 (EST-5)
Location: PORT EVERGLADES
Magnitude: 36.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm wind gust of 36 knots (41 mph) was recorded by WxFlow site XDAN at Dania Beach Pier.