A strong upper level trough across the southern Great Basin ejected out into the Southern Plains during the day on May 21st.  Strong convection developed during peak heating across the region and this convection was aided by moderate to strong instability, excessive deep layer shear and mid level lapse rates.  Add a frontal boundary to the mix and severe thunderstorms became widespread, some of which produced large hail and damaging thunderstorm wind gusts.

Funnel Cloud in BOWIE, TEXAS
From 21-MAY-13 13:17:00 to 21-MAY-13 13:17:00 (CST-6)
Location: NEW BOSTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Lightning in ANGELINA, TEXAS
From 21-MAY-13 21:30:00 to 21-MAY-13 21:30:00 (CST-6)
Location: LUFKIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A woman was struck by lightning and killed outside an eating establishment during the nighttime hours of May 21st.  She was standing outside adjacent to the restaurant holding an umbrella when she was struck.  According to a Lufkin Police spokesman, lightning entered her upper torso and exited her feet.  A chunk of concrete was blown out of the parking lot in a space to the side of the business where she was hit.
A witness said he was inside the restaurant when he heard and saw an explosion followed by sparks flying off of her and her umbrella.  At first she had stopped breathing, then began again and was put inside an ambulance but she died a short time later at an area hospital.

Thunderstorm Wind in BOWIE, TEXAS
From 21-MAY-13 13:31:00 to 21-MAY-13 13:31:00 (CST-6)
Location: OLD BOSTON
Magnitude: 55.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large oak tree was split in half and downed on a carport roof and a pickup truck.  There were no reports of injuries.

Hail in RED RIVER, TEXAS
From 21-MAY-13 14:51:00 to 21-MAY-13 14:51:00 (CST-6)
Location: FULBRIGHT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TITUS, TEXAS
From 21-MAY-13 15:27:00 to 21-MAY-13 15:27:00 (CST-6)
Location: WILKERSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CAMP, TEXAS
From 21-MAY-13 15:45:00 to 21-MAY-13 15:45:00 (CST-6)
Location: HARVARD
Magnitude: 55.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was downed on a home northwest of Pittsburg, Texas.

Thunderstorm Wind in GREGG, TEXAS
From 21-MAY-13 16:30:00 to 21-MAY-13 16:30:00 (CST-6)
Location: GREGGTON
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerlines were downed on Eastman Road and Hawkins Parkway.

Thunderstorm Wind in GREGG, TEXAS
From 21-MAY-13 16:33:00 to 21-MAY-13 16:33:00 (CST-6)
Location: GREGGTON
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was downed on Dundee Road in Longview, Texas.

Thunderstorm Wind in HARRISON, TEXAS
From 21-MAY-13 16:45:00 to 21-MAY-13 16:45:00 (CST-6)
Location: WALKERS MILL
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple trees were downed on Hwy. 154 near Nesbitt, Texas.

Thunderstorm Wind in GREGG, TEXAS
From 21-MAY-13 17:00:00 to 21-MAY-13 17:00:00 (CST-6)
Location: GREGGTON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were downed throughout the county.

Thunderstorm Wind in SMITH, TEXAS
From 21-MAY-13 17:10:00 to 21-MAY-13 17:10:00 (CST-6)
Location: TYLER
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed throughout the entire county.

Thunderstorm Wind in HARRISON, TEXAS
From 21-MAY-13 17:30:00 to 21-MAY-13 17:30:00 (CST-6)
Location: HALLSVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Hallsville, Texas.

Thunderstorm Wind in CHEROKEE, TEXAS
From 21-MAY-13 17:45:00 to 21-MAY-13 17:45:00 (CST-6)
Location: JACKSONVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerlines were downed along Hwy. 79 in Jacksonville, Texas.

Thunderstorm Wind in PANOLA, TEXAS
From 21-MAY-13 18:00:00 to 21-MAY-13 18:00:00 (CST-6)
Location: CARTHAGE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Carthage, Texas.

Thunderstorm Wind in SMITH, TEXAS
From 21-MAY-13 17:59:00 to 21-MAY-13 17:59:00 (CST-6)
Location: TROUP
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The roof was peeled back on a barn in Troup, Texas.

Thunderstorm Wind in CHEROKEE, TEXAS
From 21-MAY-13 18:20:00 to 21-MAY-13 18:20:00 (CST-6)
Location: JACKSONVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Jacksonville, Texas.

Thunderstorm Wind in PANOLA, TEXAS
From 21-MAY-13 18:30:00 to 21-MAY-13 18:30:00 (CST-6)
Location: DEADWOOD
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Deadwood, Texas.

Thunderstorm Wind in RUSK, TEXAS
From 21-MAY-13 18:45:00 to 21-MAY-13 18:45:00 (CST-6)
Location: HENDERSON
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were downed in Henderson, Texas and other parts of the county.

Thunderstorm Wind in NACOGDOCHES, TEXAS
From 21-MAY-13 18:55:00 to 21-MAY-13 18:55:00 (CST-6)
Location: NACOGDOCHES REGL ARP
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees were downed on Hwy. 59 south southwest of Nacogdoches, Texas.

Thunderstorm Wind in CHEROKEE, TEXAS
From 21-MAY-13 19:07:00 to 21-MAY-13 19:07:00 (CST-6)
Location: ALTO
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed in Alto, Texas.

Thunderstorm Wind in WOOD, TEXAS
From 21-MAY-13 15:55:00 to 21-MAY-13 15:55:00 (CST-6)
Location: OAK GROVE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The wind gust was measured on Hwy. 154 east of Quitman, Texas.

Thunderstorm Wind in CAMP, TEXAS
From 21-MAY-13 15:55:00 to 21-MAY-13 15:55:00 (CST-6)
Location: PITTSBURG
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines downed and numerous trees downed along Hwy. 11 near Pittsburg, Texas.

Thunderstorm Wind in WOOD, TEXAS
From 21-MAY-13 16:05:00 to 21-MAY-13 16:05:00 (CST-6)
Location: MINEOLA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large tree was downed onto Hwy. 69 in Mineola, Texas.

Thunderstorm Wind in BOWIE, TEXAS
From 21-MAY-13 16:05:00 to 21-MAY-13 16:05:00 (CST-6)
Location: DE KALB
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed on Martin Luther King Drive in Dekalb, Texas.

Thunderstorm Wind in BOWIE, TEXAS
From 21-MAY-13 16:07:00 to 21-MAY-13 16:07:00 (CST-6)
Location: DE KALB
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees were downed throughout the western half of the county.

Thunderstorm Wind in BOWIE, TEXAS
From 21-MAY-13 16:18:00 to 21-MAY-13 16:18:00 (CST-6)
Location: NEW BOSTON
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree was downed on a house on FM 1849 near New Boston, Texas.  There were no reports of injuries.

Thunderstorm Wind in SMITH, TEXAS
From 21-MAY-13 18:55:00 to 21-MAY-13 18:55:00 (CST-6)
Location: TYLER
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A large tree was downed on Broadway in Tyler, Texas.