A vigorous upper level trough developed over the Four Corners Region on December 26th, before taking on a negative tilt as it ejected northeast across Northwest and North Texas and much of Oklahoma during the early morning hours of the 27th. Strong southerly winds ahead of this upper trough resulted in warm, humid conditions spreading north across East Texas, North Louisiana, and extreme Southern Arkansas, resulting in weak to moderate surface based instability over these areas. Wind shear was also very strong ahead of this system, with the rapidly increasing moisture return and subtle forcing ahead of the trough allowing for scattered showers and thunderstorms to develop during the afternoon and especially during the evening over East Texas, Southeast Oklahoma, and adjacent sections of Southwest Arkansas. Isolated supercell thunderstorms developed over portions of East Texas during the evening, with several reports of large hail and damaging winds over Smith County. Meanwhile, a squall line developed just to the west over Northern and Central Texas along the ejecting upper trough, with these thunderstorms racing east across East Texas, Southeast Oklahoma, Southwest Arkansas, and North Louisiana during the late evening through the overnight hours of the 26th-27th. Numerous reports of damaging winds which downed trees and power lines were reported from this squall line over East Texas, before the strongest storms quickly exited this area after 1 AM on the 27th.
In addition to the damaging winds and large hail, locally heavy rainfall also accompanied these storms, with rainfall amounts ranging from two to four inches with isolated higher amounts. Much of these rains fell over an extended period of time, and given the already saturated grounds from much above normal rainfall that fell since September, many smaller creeks, streams, and bayous began to overflow their banks which flooded/closed numerous roadways across East Texas well after the heavy rainfall had ended during the morning hours.

Lightning in NACOGDOCHES, TEXAS
From 26-DEC-18 18:00:00 to 26-DEC-18 18:00:00 (CST-6)
Location: MELROSE
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a gas well on County Road 350, causing a large fire. No injuries were reported.

Flood in SMITH, TEXAS
From 27-DEC-18 06:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: WOOD SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

County Road 472 across Prairie Creek in Lindale was closed due to flooding well after the rains had ended.

Flood in SMITH, TEXAS
From 27-DEC-18 06:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: NOONDAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

FM 2868 over Saline Creek between Noonday and Flint was flooded and closed well after the heavier rains had ended.

Flood in GREGG, TEXAS
From 27-DEC-18 06:00:00 to 27-DEC-18 09:25:00 (CST-6)
Location: JUDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Pliler Precise Road along Roy Creek and Elm Branch Creek in north Longview was flooded and closed well after the heavier rains had ended.

Flood in GREGG, TEXAS
From 27-DEC-18 06:00:00 to 27-DEC-18 10:00:00 (CST-6)
Location: KILGORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Highway 135 overpass in Kilgore was closed due to flooding.

Flood in GREGG, TEXAS
From 27-DEC-18 06:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: KILGORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Willow Springs Road between Moccasin Trail and Woodway Street along Bighead Creek was closed due to high water well after the heavier rains had ended.

Flood in ANGELINA, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: POLLOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Numerous roads across many of the smaller creeks and streams were flooded across Angelina County well after the heavier rains had ended, including FM 706, FM 324, FM 2109, and FM 1818.

Flood in ANGELINA, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 10:00:00 (CST-6)
Location: DUNAGAN STATION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

High water was reported on numerous streets in Lufkin mostly after the heavier rains had ended, including Southwood Drive near Hoshall, the Frank Avenue underpass at Angelina Street, the Loop 287 underpasses at South First Street, and the underpass on Tulane Drive at U.S. Highway 59.

Flood in NACOGDOCHES, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: SACUL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous county roads were flooded and closed near the smaller creeks and streams in Nacogdoches County well after the heavier rains had ended, including County Roads 210, 228, 230, 234, 271, 274, 280, 302, 411, 421, 526, 620, 628, 765, 780, 836, 850, 868, and 879.

Hail in SMITH, TEXAS
From 26-DEC-18 21:50:00 to 26-DEC-18 21:50:00 (CST-6)
Location: BULLARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Quarter size hail fell in Bullard.

Hail in SMITH, TEXAS
From 26-DEC-18 21:56:00 to 26-DEC-18 21:56:00 (CST-6)
Location: WHITEHOUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Quarter sized hail fell and was measured in Whitehouse. Reports via ham radio, with pictures shared via social media.

Hail in SMITH, TEXAS
From 26-DEC-18 21:59:00 to 26-DEC-18 21:59:00 (CST-6)
Location: WHITEHOUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter sized hail fell on the northwest side of Whitehouse.

Thunderstorm Wind in SMITH, TEXAS
From 26-DEC-18 22:27:00 to 26-DEC-18 22:27:00 (CST-6)
Location: OMEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed on County Road 294 and Highway 64 East.

Thunderstorm Wind in SMITH, TEXAS
From 26-DEC-18 22:27:00 to 26-DEC-18 22:27:00 (CST-6)
Location: BOSTICK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down at 5170 Country Estates Drive just northeast of Tyler.

Thunderstorm Wind in SMITH, TEXAS
From 26-DEC-18 22:35:00 to 26-DEC-18 22:35:00 (CST-6)
Location: BROWNING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree fell onto a power line at the 11600 block of County Road 246 South.

Thunderstorm Wind in SMITH, TEXAS
From 26-DEC-18 22:25:00 to 26-DEC-18 22:25:00 (CST-6)
Location: WOOD SPGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees down at the 13300 block of County Road 472 in Lindale.

Thunderstorm Wind in SMITH, TEXAS
From 26-DEC-18 22:26:00 to 26-DEC-18 22:26:00 (CST-6)
Location: THEDFORD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were downed at 15307 of County Road 498 just east of Lindale.

Thunderstorm Wind in CAMP, TEXAS
From 26-DEC-18 22:50:00 to 26-DEC-18 22:50:00 (CST-6)
Location: LEESBURG
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were downed on Highway 11 and County Road 1519 north in the Leesburg community.

Thunderstorm Wind in CAMP, TEXAS
From 26-DEC-18 23:00:00 to 26-DEC-18 23:00:00 (CST-6)
Location: PITTSBURG
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees down over North Avenue and Garrett Avenue in Pittsburg.

Thunderstorm Wind in RUSK, TEXAS
From 26-DEC-18 23:15:00 to 26-DEC-18 23:15:00 (CST-6)
Location: HENDERSON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were downed across much of Rusk County.

Thunderstorm Wind in UPSHUR, TEXAS
From 26-DEC-18 23:15:00 to 26-DEC-18 23:15:00 (CST-6)
Location: SAULES CHAPEL
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines were downed on the west side of Upshur County.

Thunderstorm Wind in MORRIS, TEXAS
From 26-DEC-18 23:32:00 to 26-DEC-18 23:32:00 (CST-6)
Location: CASON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree was blown down on FM 144 near Cason.

Thunderstorm Wind in MORRIS, TEXAS
From 26-DEC-18 23:35:00 to 26-DEC-18 23:35:00 (CST-6)
Location: LONE STAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines were downed on CR 2225 just southwest of the Jenkins community.

Thunderstorm Wind in MORRIS, TEXAS
From 26-DEC-18 23:35:00 to 26-DEC-18 23:35:00 (CST-6)
Location: DANGERFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and and power lines were blown down on County Road 4108 near Daingerfield.

Thunderstorm Wind in BOWIE, TEXAS
From 27-DEC-18 00:14:00 to 27-DEC-18 00:14:00 (CST-6)
Location: REDWATER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous tree were downed across much of Bowie County.

Thunderstorm Wind in CASS, TEXAS
From 27-DEC-18 00:44:00 to 27-DEC-18 00:44:00 (CST-6)
Location: QUEEN CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees were blown down on Highway 251 between Queen City and Bloomburg.

Thunderstorm Wind in HARRISON, TEXAS
From 27-DEC-18 01:10:00 to 27-DEC-18 01:10:00 (CST-6)
Location: DARCO
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed between Highway 43 and Rosborough Springs Road.

Thunderstorm Wind in MARION, TEXAS
From 27-DEC-18 01:15:00 to 27-DEC-18 01:15:00 (CST-6)
Location: NORTH JEFFERSON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were blown down across much of Marion County.

Thunderstorm Wind in SABINE, TEXAS
From 27-DEC-18 05:25:00 to 27-DEC-18 05:25:00 (CST-6)
Location: HEMPHILL
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees down on Highway 83 near Hemphill.

Flood in ANGELINA, TEXAS
From 27-DEC-18 04:53:00 to 27-DEC-18 12:00:00 (CST-6)
Location: ZAVALLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 63 was flooded near Bob Boulware Road.

Flood in ANGELINA, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: DUNAGAN STATION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Homer Alto Road was flooded at a small creek near Acorn Drive, well after the rains had ended.

Flood in ANGELINA, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 07:00:00 (CST-6)
Location: CLAWSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 69 North near Massingill's Meat Market was flooded.

Flood in ANGELINA, TEXAS
From 27-DEC-18 05:00:00 to 27-DEC-18 12:00:00 (CST-6)
Location: CENTRAL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Crawford Creek flooded FM 2021 near Highway 103 West.

Flood in CHEROKEE, TEXAS
From 27-DEC-18 05:03:00 to 27-DEC-18 12:00:00 (CST-6)
Location: CUNEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous county roads were flooded near the smaller creeks and streams across Cherokee County, which occurred as runoff continued well after the rains had ended.

Thunderstorm Wind in NACOGDOCHES, TEXAS
From 27-DEC-18 02:10:00 to 27-DEC-18 02:10:00 (CST-6)
Location: NACOGDOCHES REGL ARP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large tree was blown down in front of a home on Sandy Ridge Road just off of FM 225 near Nacogdoches.