The following events were reported: Hail, Thunderstorm Wind, Tornado. These occurred near station USW00012916, approximately 28.3821 km away, between 2017-02-07 10:20:00 and 2017-02-07 11:32:00. The events included records with hailstones measuring 20.333333333333332 inches.The events resulted in 36 injuries and 0 fatalities. No significant property or crop damage was reported. Episode Narrative: Severe thunderstorms developed ahead of an approaching cold front across southeast Louisiana, southern Mississippi, and the adjacent coastal waters. Severe thunderstorms developed ahead of an approaching cold front across southeast Louisiana, southern Mississippi, and the adjacent coastal waters. Event Narrative: A tornado touched down near the intersection of Carthage Bluff Road and Carthage Lane on the south side of Killian causing minor damage to a home and some trees. As it moved east-northeast along Carthage Bluff Road, it strengthened and snapped or uprooted numerous trees. It continued to strengthen further as it approached Davidson Road. In this area, it is estimated to have reached its peak intensity with winds near 120 mph. It destroyed three barns and destroyed a single family home that had been built on a cinder block foundation. The maximum estimated wind speed is based on this destroyed home which was not secured to the foundation, and also supported by snapped telephone poles in the area. The tornado then moved into a marshy area and continued to snap and uproot numerous trees as it moved into Tangipahoa Parish. Two people were seriously injured in the home that was destroyed on Davidson Road. A large wedge tornado continued on an east-northeast path out of Livingston Parish. While much of the path through Tangipahoa Parish is inaccessible, video evidence shows the tornado was continuously in contact with the ground. The tornado crossed Interstate 55 near mile marker 19. In this area, it snapped an uprooted numerous trees and was approximately 500 yards wide. After crossing the interstate, the tornado continued on its east-northeast path through marshy area and moved into St. Tammany Parish. The maximum intensity in Tangipahoa Parish is estimated to be around 105 mph based on the observed tree damage. A tornado continued into St. Tammany Parish from Tangipahoa Parish. It moved in a generally east-northeast direction through uninhabited marsh until it reached the Guste Island area. By the time it reached this area, it had contracted from its maximum width of around 500 yards in Tangipahoa Parish back to around 350 yards. The tornado produced damage consistent with wind speeds around 125 mph as it crossed Chenier Road. It shifted a home from its concrete and rebar piers and caused extensive roof damage to the home. The tornado continued to move east-northeast and dissipated over a marshy area on the southwest side of Madisonville. The tornado touched down near Elmwood on St. George Avenue. It moved east northeast causing intermittent tree and roof damage. It lifted near Jefferson Heights around the intersection of Sizeler Avenue and Lauricella Avenue. Maximum wind speeds are estimated around 80 mph. A tornado touched down just east of the industrial canal and moved northeast into the Evangeline Oaks Subdivision where it quickly strengthened into a multi-vortex EF-2 tornado. In this area, it snapped several power poles and caused significant roof damage to an apartment complex as well as a building similar to an automobile service building. the tornado then turned toward the east and continued to move almost due east through neighborhoods just north of Chef Menteur Blvd. The worst damage was generally along and just north of Grant Street from Read Blvd to Chalmark Dr. In this area, dozens of homes lost all or large portions of their roof structures. Several homes also had numerous collapsed walls. A few two story homes suffered almost complete destruction of the top floor with the exception of one or two interior corner walls. The tornado also bent at least 3 steel electrical transmission poles. The tornado continued moving toward the east, causing damage to the NASA Michoud facility and a few other industrial buildings in the area, and rolling a rail tanker car east of the Michoud Canal. The track is terminated at Lake Borgne, but the tornado likely continued for some time after that over water. Of the 33 injuries, 5-6 of them were considered serious. Maximum estimated wind speeds were around 150 mph. In total, the tornado caused moderate to severe damage to 638 homes, of which around half were considered total losses. At least 40 businesses also suffered moderate to severe damage. Relative of NWS employee reported ping pong ball sized hail. Ping pong ball sized hail was reported in New Orleans East. A WeatherFlow station at New Orleans Lakefront Airport measured a 67 mph wind gust. The strong winds flipped several light air craft parked at the airport.