Strong low pressure moving out of the Gulf of Mexico produced two waves of severe weather across southeast Louisiana and the adjacent coastal waters. The first round was associated with a warm front on the afternoon of the 3rd, the second with a cold front early in the morning of the 4th.

Thunderstorm Wind in LAFOURCHE, LOUISIANA
From 03-MAY-17 13:03:00 to 03-MAY-17 13:03:00 (CST-6)
Location: RACELAND
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Lafourche Parish Emergency Manager reported multiple trees blown down by thunderstorms winds in Raceland.

Hail in JEFFERSON, LOUISIANA
From 03-MAY-17 08:50:00 to 03-MAY-17 08:50:00 (CST-6)
Location: GRAND ISLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Quarter size hail was reported in Grand Isle.

Lightning in EAST BATON ROUGE, LOUISIANA
From 03-MAY-17 18:45:00 to 03-MAY-17 18:45:00 (CST-6)
Location: BROADMOOR
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a house on Melrose Boulevard around 745 pm, which led to a fire. The house sustained heavy smoke damage according to the Baton Rouge Fire Department. The fire was put out, but reignited on the morning of the 4th, destroying the house.

Thunderstorm Wind in TERREBONNE, LOUISIANA
From 03-MAY-17 12:58:00 to 03-MAY-17 12:58:00 (CST-6)
Location: HOUMA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Terrebonne Parish Emergency Manager reported multiple trees blown down by thunderstorm winds in Houma.

Thunderstorm Wind in TERREBONNE, LOUISIANA
From 03-MAY-17 23:00:00 to 03-MAY-17 23:00:00 (CST-6)
Location: MONTEGUT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blocking one lane of Louisiana Highway 665 in Pointe Aux Chenes.

Thunderstorm Wind in ST. TAMMANY, LOUISIANA
From 03-MAY-17 20:15:00 to 03-MAY-17 20:15:00 (CST-6)
Location: ST JOE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

One tree was blown down, and another snapped in half along Robert Road between Slidell and Pearl River. Event time was estimated based on radar.

Thunderstorm Wind in TERREBONNE, LOUISIANA
From 03-MAY-17 22:45:00 to 03-MAY-17 22:45:00 (CST-6)
Location: DULAC
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down on Grand Caillou Road, one mile south of Dulac Bridge.

Thunderstorm Wind in ST. TAMMANY, LOUISIANA
From 03-MAY-17 20:05:00 to 03-MAY-17 20:05:00 (CST-6)
Location: BONFOUCA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Trees were blown down on Thompson Road and on Gause Boulevard near Northshore Boulevard. Event time was estimated based on radar.

Thunderstorm Wind in LAFOURCHE, LOUISIANA
From 03-MAY-17 23:22:00 to 03-MAY-17 23:22:00 (CST-6)
Location: PORT FOURCHON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few power poles were snapped and others bent over in the marshy area along Louisiana Highway 1 west of Grand Isle. Event time was estimated based on radar.

Thunderstorm Wind in ST. TAMMANY, LOUISIANA
From 03-MAY-17 19:50:00 to 03-MAY-17 19:50:00 (CST-6)
Location: LACOMBE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees were reported blown down in Lacombe on Louisiana Highway 434 and Pontchartrain Drive.

Thunderstorm Wind in TERREBONNE, LOUISIANA
From 03-MAY-17 21:49:00 to 03-MAY-17 21:49:00 (CST-6)
Location: DULAC
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Weatherflow observation tower near Dulac reported a 67 mph wind gust.

Thunderstorm Wind in LAFOURCHE, LOUISIANA
From 03-MAY-17 23:20:00 to 03-MAY-17 23:20:00 (CST-6)
Location: PORT FOURCHON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Telephone lines and electrical transformers were blown down at Port Fourchon.