A wake low developed on the backside of a cluster of showers and thunderstorms racing south across southeast Louisiana. This drastically enhanced downdraft winds, producing long duration winds around tropical storm strength across the area with peak gusts as strong as a weak hurricane.

Marine Thunderstorm Wind in LAKE PONCHARTRAIN AND LAKE MAUREPAS, GULF OF MEXICO
From 13-APR-21 18:12:00 to 13-APR-21 18:12:00 (CST-6)
Location: MID LAKE PONTCHARTRAIN
Magnitude: 37.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow mesonet on the Causeway Bridge near Mid Lake measured a thunderstorm wind gust of 37 knots or 43 mph.

Marine Thunderstorm Wind in LAKE PONCHARTRAIN AND LAKE MAUREPAS, GULF OF MEXICO
From 13-APR-21 18:57:00 to 13-APR-21 18:57:00 (CST-6)
Location: LKFRNT ARPT NEW
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Lakefront Airport ASOS measured a thunderstorm wind gust of 44 knots or 51 mph.

Marine Thunderstorm Wind in LAKE PONCHARTRAIN AND LAKE MAUREPAS, GULF OF MEXICO
From 13-APR-21 19:00:00 to 13-APR-21 19:00:00 (CST-6)
Location: NEW CANAL STATION (NWCL1)
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow mesonet at New Canal measured a thunderstorm wind gust of 47 knots or 54 mph.

Marine Thunderstorm Wind in COASTAL WATERS FROM SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON LOUISIANA OUT 20 NM, GULF OF MEXICO
From 13-APR-21 20:00:00 to 13-APR-21 20:00:00 (CST-6)
Location: GRAND ISLE STATION (GISL1)
Magnitude: 44.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Barataria Pass mesonet measured a gust of 44 knots or 51 mph.

Marine Thunderstorm Wind in COASTAL WATERS FROM SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON LOUISIANA OUT 20 NM, GULF OF MEXICO
From 13-APR-21 21:00:00 to 13-APR-21 21:00:00 (CST-6)
Location: BURLWOOD C-MAN STATION (BURL1)
Magnitude: 46.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The BURL1 Southwest Pass mesonet measured a thunderstorm wind gust of 46 knots or 53 mph.

Marine Thunderstorm Wind in COASTAL WATERS FROM PORT FOURCHON LOUISIANA TO LOWER ATCHAFALAYA RIVER LOUISIANA OUT 20 NM, GULF OF MEXICO
From 13-APR-21 15:30:00 to 13-APR-21 15:41:00 (CST-6)
Location: SOUTH TIMBALIER STATION (SPLL1)
Magnitude: 65.00 MG
Property damage: 50.00M
Crop damage: 0.00K
Reported by: Other Federal Agency

Seacor Power lift boat capsized when the bow echo moved off the southeast Louisiana coast during the mid afternoon. 13 of 19 crew members onboard perished (7 of those are lost and presumed dead).�� Convective wind gusts to 75 mph were observed. Conditions from the wake low winds hampered recovery efforts to Seacor Power.

Marine Thunderstorm Wind in COASTAL WATERS FROM SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON LOUISIANA OUT 20 NM, GULF OF MEXICO
From 13-APR-21 20:30:00 to 13-APR-21 20:30:00 (CST-6)
Location: GRAND ISLE STATION (GISL1)
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The GISL1 NOS gauge on Grand Isle measured a thunderstorm wind gust of 65 knots or 75 mph.