A potent...upper level short wave accompanied a prefrontal feature during the afternoon hours of November 29th across north central Louisiana.  These thunderstorms developed in a weakly unstable airmass across the region.  However...there was strong wind shear present...especially in the lowest 3 kilometers of the atmosphere.  A broken line of thunderstorms developed across east central Texas into northwest Louisiana along the prefrontal trough axis.  These thunderstorms quickly became supercells.  One of these storms produced a significant tornado in Winn Parish which traveled northeast and dropped again in southern Ouachita Parish.  Other storms downed powerlines in northwest Louisiana and minor flooding problems.

Thunderstorm Wind in SABINE, LOUISIANA
From 29-NOV-10 17:41:00 to 29-NOV-10 17:41:00 (CST-6)
Location: NEGREET
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerlines were downed at Walkerville Road and Hwy. 191 south near the community of Negreet, Louisiana.

Flash Flood in OUACHITA, LOUISIANA
From 29-NOV-10 16:40:00 to 29-NOV-10 17:40:00 (CST-6)
Location: MONROE
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A truck was stalled under a railroad bridge on Trenton Street in West Monroe.

Tornado in WINN, LOUISIANA
From 29-NOV-10 15:12:00 to 29-NOV-10 15:25:00 (CST-6)
Location: ATLANTA
Tornado F-scale: EF4
Property damage: 750.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous trees were snapped near the intersection of Collier and Water Well Roads. The tornado then crossed Gum Springs Road, where it completely destroyed one well-built two story brick home and an adjacent brick garage. The home was approximately 4000 sq. ft in size, built in 1997, and its destruction was the basis of the EF-4 rating. Many of the nearby trees were completely snapped, with several near the home snapped off at the base. One single wide mobile home was also destroyed, with its remnants blown into a wooded area about 300 yards away. Another nearby home was moderately damaged, while two other homes suffered minor damage. The tornado then crossed into an open field, before entering a heavily wooded area, traveling northeast across Highways 84 and 167, where sporadic minor tree damage was observed just west and north of Winnfield.  Maximum winds are estimated around 170 mph, with a maximum width of 400 yards.

Tornado in OUACHITA, LOUISIANA
From 29-NOV-10 16:18:00 to 29-NOV-10 16:26:00 (CST-6)
Location: LUNA
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado touched down in an inaccessible wooded area west of the Ouachita River. The tornado traveled east into an open field off of Hooter Road West, where it entered a wooded area. Numerous trees and branches were snapped, before it weakened as it moved over a home along Hooter Road East. A metal awning on the backside of the home was torn off and deposited in the front yard of the home, as well as a large open field between the home and a levee along the Ouachita River. Some shingles were also removed from the home. Tree tops along the levee were also snapped, as the tornado traveled northeast and lifted along Highway 165 in the Boscoe community.  Maximum winds are estimated around 90 mph, with a maximum width of 100 yards.