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 PANOLA, TEXAS
From 20-DEC-12 00:50:00 to 20-DEC-12 00:50:00 (CST-6)
Location: CARTHAGE
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and powerlines were downed throughout the county.

Thunderstorm Wind in NACOGDOCHES, TEXAS
From 20-DEC-12 00:55:00 to 20-DEC-12 00:55:00 (CST-6)
Location: NACOGDOCHES
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several trees and powerlines were downed across the entire county.

Thunderstorm Wind in CAMP, TEXAS
From 19-DEC-12 23:25:00 to 19-DEC-12 23:25:00 (CST-6)
Location: PITTSBURG
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A power pole was downed across Hwy. 11 just west of Pittsburg, Texas.

Thunderstorm Wind in GREGG, TEXAS
From 19-DEC-12 23:35:00 to 19-DEC-12 23:35:00 (CST-6)
Location: GLADEWATER
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were downed with debris across Hwy. 80 in Gladewater, Texas.

Thunderstorm Wind in MORRIS, TEXAS
From 19-DEC-12 23:35:00 to 19-DEC-12 23:35:00 (CST-6)
Location: DANGERFIELD
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were downed across the county with powerlines downed as well.

Thunderstorm Wind in BOWIE, TEXAS
From 19-DEC-12 23:10:00 to 19-DEC-12 23:10:00 (CST-6)
Location: DE KALB
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire Department reported that powerlines were downed throughout town.

Thunderstorm Wind in MARION, TEXAS
From 20-DEC-12 00:30:00 to 20-DEC-12 00:30:00 (CST-6)
Location: SMITHLAND
Magnitude: 59.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Damaging wind gusts blew the roof off a porch of a home on CR. 3300 near the Smithland community just north of Hwy. 49.

Thunderstorm Wind in BOWIE, TEXAS
From 19-DEC-12 23:40:00 to 19-DEC-12 23:40:00 (CST-6)
Location: MAUD
Magnitude: 59.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree was downed in Maud, Texas across FM. 2149.

Thunderstorm Wind in BOWIE, TEXAS
From 19-DEC-12 23:40:00 to 19-DEC-12 23:40:00 (CST-6)
Location: VICTORY CITY
Magnitude: 59.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A tree fell on a home in Leary, Texas.  There were no reports of injuries.

Thunderstorm Wind in BOWIE, TEXAS
From 19-DEC-12 23:30:00 to 19-DEC-12 23:30:00 (CST-6)
Location: NEW BOSTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were downed on Cannon Street in New Boston, Texas.

Thunderstorm Wind in ANGELINA, TEXAS
From 20-DEC-12 01:10:00 to 20-DEC-12 01:10:00 (CST-6)
Location: LUFKIN
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees were downed across the county.

Thunderstorm Wind in RUSK, TEXAS
From 20-DEC-12 00:35:00 to 20-DEC-12 00:35:00 (CST-6)
Location: MT ENTERPRISE
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and powerlines were downed in the Mount Enterprise community.

Thunderstorm Wind in RED RIVER, TEXAS
From 19-DEC-12 22:45:00 to 19-DEC-12 22:45:00 (CST-6)
Location: CLARKSVILLE
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several reports of trees and powerlines downed throughout Red River County.

Thunderstorm Wind in BOWIE, TEXAS
From 19-DEC-12 23:45:00 to 19-DEC-12 23:45:00 (CST-6)
Location: REDWATER
Magnitude: 59.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A transformer was blown down along Hwy. 991 in the Redwater community.

Thunderstorm Wind in MORRIS, TEXAS
From 19-DEC-12 23:40:00 to 19-DEC-12 23:40:00 (CST-6)
Location: LONE STAR
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Large tree limbs and branches were downed in Lone Star, Texas.

Thunderstorm Wind in SAN AUGUSTINE, TEXAS
From 20-DEC-12 01:51:00 to 20-DEC-12 01:51:00 (CST-6)
Location: SAN AUGUSTINE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several trees were downed in San Augustine, Texas.

Thunderstorm Wind in CAMP, TEXAS
From 19-DEC-12 23:15:00 to 19-DEC-12 23:15:00 (CST-6)
Location: HARVARD
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was downed onto a mobile home north of Pittsburg, Texas.  There was no report of injuries.

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

Numerous trees and powerlines were downed across the entire county.

Thunderstorm Wind in CHEROKEE, TEXAS
From 20-DEC-12 00:05:00 to 20-DEC-12 00:05:00 (CST-6)
Location: JACKSONVILLE
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees were downed in the Jacksonville, Texas community.

Thunderstorm Wind in MARION, TEXAS
From 20-DEC-12 00:05:00 to 20-DEC-12 00:05:00 (CST-6)
Location: JEFFERSON
Magnitude: 62.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: State Official

The roof was taken off a home by strong winds in Jefferson, Texas.  There were no reports of injuries.

Thunderstorm Wind in FRANKLIN, TEXAS
From 19-DEC-12 22:55:00 to 19-DEC-12 22:55:00 (CST-6)
Location: MT VERNON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees and powerlines were downed across all of Franklin County.

Thunderstorm Wind in UPSHUR, TEXAS
From 19-DEC-12 23:20:00 to 19-DEC-12 23:20:00 (CST-6)
Location: BIG SANDY
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed in Big Sandy on Hwy. 155.

Thunderstorm Wind in MARION, TEXAS
From 20-DEC-12 00:06:00 to 20-DEC-12 00:06:00 (CST-6)
Location: LASSATER
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were downed on Hwy. 49 in Kellyville, Texas northwest of Jefferson.

Thunderstorm Wind in RUSK, TEXAS
From 20-DEC-12 00:15:00 to 20-DEC-12 00:15:00 (CST-6)
Location: HENDERSON
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several trees and powerlines were downed across the county.

Thunderstorm Wind in TITUS, TEXAS
From 19-DEC-12 23:10:00 to 19-DEC-12 23:10:00 (CST-6)
Location: MT PLEASANT MUNI ARP
Magnitude: 60.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was downed on a house south of Mount Pleasant.  There was no report of injuries.

Thunderstorm Wind in HARRISON, TEXAS
From 20-DEC-12 00:30:00 to 20-DEC-12 00:30:00 (CST-6)
Location: MARSHALL
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and powerlines were downed throughout the entire county.