EF1 tornado in Terrebonne Parish, Louisiana

An EF-1 tornado touched down over inaccessible areas west of Bayou Dularge and tracked northeast toward Crozier Drive. Predominantly minor to moderate patches of tree damage were visible on high resolution satellite imagery along its path which were collocated with a tornado debris signature on Climavision radar V014. Trees were more evidently displaced and damaged as the tornado exited the inaccessible marsh and forested areas and moved over Crozier Drive. A NWS survey team observed two homes on Crozier Drive that had significant roof loss and at least one exterior wall collapsed for both homes. The tornado continued northeast across Bayou Dularge Rd and into more inaccessible marsh and forest vegetation where more minor damage was evident on satellite imagery. The end point of this tornado is estimated and it's possible it extended further northeast though no conclusive evidence of damage was identified.

A mesoscale convective system formed on the eastern side of Post-Tropical Storm Arthur on June 18th. Favorable low level winds allowed for multiple mini-supercells to form on the leading edge of the mesoscale convective system resulting in several tornadoes impacting the Houma and New Orleans metro areas. These tornadoes were rated as EF-0 and EF-1 events. Additionally, the mesoscale convective complex tapped into a region of deep tropical moisture with atmospheric moisture content well above normal levels for mid-June. This resulted in several significant flash flooding events in portions of the Houma and New Orleans metro areas including the cities of Houma, Kenner, and Slidell. Another area of heavy rainfall from thunderstorms formed over central Louisiana near the center of Post-Tropical Storm Arthur producing flash flooding in portions of Pointe Coupee Parish. Lingering moisture and weak upper level troughing associated with the slow moving remnants of Post-Tropical Storm Arthur produced additional thunderstorm activity on June 19th. This activity was focused in metro New Orleans where a brief EF-0 tornado developed in the community of Arabi. On June 20th, another band of thunderstorms developed along a lingering boundary stretching from coastal Louisiana toward New Orleans. This band of thunderstorms produced heavy rainfall and impacted portions of the Houma and New Orleans metro areas producing a few flash flooding events in Houma, Destrehan, and Kenner.