EF0 tornado in St. Charles Parish, Louisiana

NWS ground survey in addition to high resolution satellite analysis confirmed an EF-0 tornado tracked from northeast of Bayou Gauche to west of Luling, LA in St. Charles Parish. The tornado damaged a patch of trees on high resolution satellite imagery and additional damage to marsh vegetation was evident with brief, weak tornado debris signatures also present on KHDC during this time. The tornado continued bending northward in direction as it approached the Blouin Canal with a larger, well-defined tornado debris signature becoming more evident on approach. A large tree was visibly damaged/displaced on high res satellite imagery in addition to other minor tree damage noted near Santa Cruz Ct as the tornado began to weaken and lift. The only minor tree damage was noted by the ground surveyor in the location.

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.