A very unstable airmass developed across the Four State region during the afternoon and evening hours of December 12th. A potent upper level storm system moved out of the Inter Mountain West and into the Southern Plains during the afternoon as well. A warm front moved north of the region allowing for dewpoint temperatures well into the 60s across the entire region. Shear was very strong ahead of this upper level storm system with nearly 70 knots of deep layer shear. The wind profile however was unidirectional which given the instability in place, provided the necessary ingredients for a squall line to develop. Storms originally developed across North Central Texas and Southern Oklahoma along a prefrontal surface trough. The broken line of storms increased in coverage and intensity with the squall line moving through the entire Four State Region during the late night hours of the 19th and early morning hours of the 20th. Wind damage was widespread across the entire Four State Region.

Thunderstorm Wind in BOSSIER, LOUISIANA
From 20-DEC-12 00:45:00 to 20-DEC-12 00:45:00 (CST-6)
Location: BENTON
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local Law Enforcement reported widespread trees downed along Old Plain Dealing Road between Benton and Plain Dealing.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-DEC-12 01:00:00 to 20-DEC-12 01:00:00 (CST-6)
Location: JEWELLA
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few trees were downed near West Lakeshore Drive.

Thunderstorm Wind in BOSSIER, LOUISIANA
From 20-DEC-12 00:45:00 to 20-DEC-12 00:45:00 (CST-6)
Location: PLAIN DEALING
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed in the Plain Dealing community.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-DEC-12 00:45:00 to 20-DEC-12 00:45:00 (CST-6)
Location: GILLIAM
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Two barns, several outbuildings and other debris were thrown several hundred yards downwind from the Bruce Lynn Farms in Gilliam, Louisiana.

Thunderstorm Wind in WEBSTER, LOUISIANA
From 20-DEC-12 01:10:00 to 20-DEC-12 01:10:00 (CST-6)
Location: SHONGALOO
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed across the entire parish.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-DEC-12 01:10:00 to 20-DEC-12 01:10:00 (CST-6)
Location: JEWELLA
Magnitude: 54.00 EG
Property damage: 70.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large number of bricks were blown off a multi-story building owned by Christus Schumpert Health System at the corner of Jordan Street and Southern Avenue.  The bricks that fell damaged an awning and security fence below.  A large tree also fell on a home and a car on Fairway Street.  There were no report of injuries.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-DEC-12 01:05:00 to 20-DEC-12 01:05:00 (CST-6)
Location: JEWELLA
Magnitude: 54.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large pine tree fell on a home on Pine Grove Street in South Shreveport.

Thunderstorm Wind in BIENVILLE, LOUISIANA
From 20-DEC-12 02:09:00 to 20-DEC-12 02:09:00 (CST-6)
Location: BIENVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A tree was downed across a local highway in Bienville, Louisiana.

Thunderstorm Wind in RED RIVER, LOUISIANA
From 20-DEC-12 02:10:00 to 20-DEC-12 02:10:00 (CST-6)
Location: COUSHATTA
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Powerlines were downed just north of Coushatta, Louisiana.

Thunderstorm Wind in UNION, LOUISIANA
From 20-DEC-12 02:15:00 to 20-DEC-12 02:15:00 (CST-6)
Location: TRUXNO
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees and powerlines were downed near Truxno along Hwy. 549.

Thunderstorm Wind in DE SOTO, LOUISIANA
From 20-DEC-12 01:30:00 to 20-DEC-12 01:30:00 (CST-6)
Location: MANSFIELD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees were downed throughout the parish.

Thunderstorm Wind in LINCOLN, LOUISIANA
From 20-DEC-12 02:20:00 to 20-DEC-12 02:20:00 (CST-6)
Location: RUSTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed across the entire parish including a few trees and powerlines downed near Hwy. 544 near Wafer.

Thunderstorm Wind in WEBSTER, LOUISIANA
From 20-DEC-12 01:00:00 to 20-DEC-12 01:00:00 (CST-6)
Location: SPRINGHILL
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was down on a house in the Cullen community.  There were no reports of injuries.

Thunderstorm Wind in CLAIBORNE, LOUISIANA
From 20-DEC-12 01:40:00 to 20-DEC-12 01:40:00 (CST-6)
Location: CORNEY LAKE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Summerfield, Louisiana.

Thunderstorm Wind in JACKSON, LOUISIANA
From 20-DEC-12 02:25:00 to 20-DEC-12 02:25:00 (CST-6)
Location: JONESBORO
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and powerlines were downed in Jonesboro, Louisiana.

Thunderstorm Wind in UNION, LOUISIANA
From 20-DEC-12 02:30:00 to 20-DEC-12 02:30:00 (CST-6)
Location: FARMERVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed across the entire parish.

Thunderstorm Wind in NATCHITOCHES, LOUISIANA
From 20-DEC-12 02:40:00 to 20-DEC-12 02:40:00 (CST-6)
Location: NATCHITOCHES
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed across Hwy. 9 in Natchitoches, Louisiana.

Thunderstorm Wind in WINN, LOUISIANA
From 20-DEC-12 03:05:00 to 20-DEC-12 03:05:00 (CST-6)
Location: WINNFIELD
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees downed across the entire parish.

Thunderstorm Wind in CLAIBORNE, LOUISIANA
From 20-DEC-12 01:30:00 to 20-DEC-12 01:30:00 (CST-6)
Location: HOMER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were downed in Homer, Louisiana.