An upper level area of low pressure moved out of the southern Rockies into the plains and combined with a dryline to produce severe thunderstorms on successive days. On May 11th the storms were mainly in the northeastern part of the forecast area. On May 12th they were more widespread starting out west and moving to the east.  There were several spottings of possible funnel clouds and even tornadoes near Uvalde and Hondo but a NWS damage survey could not find any tornadic damage.  Several pictures and small cell phone videos were inconclusive.  Large outflow in front of storms likely caused several small spinup gustnadoes which may explain some of the reports on the leading edge of the storms.  Another possible tornado was reported 7 miles south of Giddings along Highway 77.  Damage survey did find a damaged barn but no conclusive tornado damage.

Thunderstorm Wind in BEXAR, TEXAS
From 12-MAY-11 08:45:00 to 12-MAY-11 08:45:00 (CST-6)
Location: WOODLAWN LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A thunderstorm produced wind gusts estimated at 50 knots which blew down multiple trees, primarily on the west side of San Antonio.

Hail in BEXAR, TEXAS
From 12-MAY-11 09:00:00 to 12-MAY-11 09:00:00 (CST-6)
Location: KIRBY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BEXAR, TEXAS
From 12-MAY-11 09:01:00 to 12-MAY-11 09:01:00 (CST-6)
Location: WOODLAWN LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in TRAVIS, TEXAS
From 12-MAY-11 09:08:00 to 12-MAY-11 09:08:00 (CST-6)
Location: WILLIAMSON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in TRAVIS, TEXAS
From 12-MAY-11 09:08:00 to 12-MAY-11 09:08:00 (CST-6)
Location: AUSTIN BIRDSNEST ARP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A thunderstorm produced wind gusts estimated at 52 knots along with pea to nickel size hail.

Hail in DIMMIT, TEXAS
From 12-MAY-11 09:15:00 to 12-MAY-11 09:15:00 (CST-6)
Location: CATARINA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in GUADALUPE, TEXAS
From 12-MAY-11 09:30:00 to 12-MAY-11 09:30:00 (CST-6)
Location: SEGUIN
Magnitude: 45.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 45 knots which caused some roof damage in Seguin.

Thunderstorm Wind in TRAVIS, TEXAS
From 12-MAY-11 09:45:00 to 12-MAY-11 09:45:00 (CST-6)
Location: OAK HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 50 knots which knocked down some large tree limbs.

Thunderstorm Wind in BASTROP, TEXAS
From 12-MAY-11 10:00:00 to 12-MAY-11 10:00:00 (CST-6)
Location: BASTROP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A thunderstorm produced wind gusts estimated at 50 knots which blew down a few trees in the Bastrop area.

Hail in KERR, TEXAS
From 11-MAY-11 11:04:00 to 11-MAY-11 11:04:00 (CST-6)
Location: MOUNTAIN HOME ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GILLESPIE, TEXAS
From 11-MAY-11 13:15:00 to 11-MAY-11 13:15:00 (CST-6)
Location: DOSS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in BEXAR, TEXAS
From 12-MAY-11 10:17:00 to 12-MAY-11 10:17:00 (CST-6)
Location: WOODLAWN LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorms produced heavy rain which caused road closures in the north and northeast parts of San Antonio.

Thunderstorm Wind in GONZALES, TEXAS
From 12-MAY-11 10:20:00 to 12-MAY-11 10:20:00 (CST-6)
Location: GONZALES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 50 knots which knocked down trees on the golf course in Gonzales.

Hail in LLANO, TEXAS
From 11-MAY-11 13:50:00 to 11-MAY-11 13:50:00 (CST-6)
Location: CASTELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A thunderstorm produced hail from pea size to one inch.

Thunderstorm Wind in ZAVALA, TEXAS
From 12-MAY-11 07:15:00 to 12-MAY-11 07:15:00 (CST-6)
Location: COMETA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 61 knots along with penny to nickel size hail.

Hail in TRAVIS, TEXAS
From 12-MAY-11 07:55:00 to 12-MAY-11 07:55:00 (CST-6)
Location: BLUFF SPGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KENDALL, TEXAS
From 12-MAY-11 08:00:00 to 12-MAY-11 08:00:00 (CST-6)
Location: BOERNE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FAYETTE, TEXAS
From 12-MAY-11 10:40:00 to 12-MAY-11 10:40:00 (CST-6)
Location: LA GRANGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 50 knots which knocked down some large tree limbs in La Grange.

Hail in MAVERICK, TEXAS
From 11-MAY-11 14:12:00 to 11-MAY-11 14:12:00 (CST-6)
Location: QUEMADO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Hail in BURNET, TEXAS
From 11-MAY-11 14:15:00 to 11-MAY-11 14:15:00 (CST-6)
Location: MARBLE FALLS ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LEE, TEXAS
From 12-MAY-11 10:40:00 to 12-MAY-11 10:40:00 (CST-6)
Location: DIME BOX
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A thunderstorm produced wind gusts estimated at 50 knots which knocked down a large tree across Hwy 121 in Dime Box.

Hail in LLANO, TEXAS
From 11-MAY-11 14:39:00 to 11-MAY-11 14:39:00 (CST-6)
Location: LLANO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BURNET, TEXAS
From 12-MAY-11 08:15:00 to 12-MAY-11 08:15:00 (CST-6)
Location: LAKE VICTOR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A thunderstorm produced quarter to golf ball size hail.

Hail in DIMMIT, TEXAS
From 12-MAY-11 08:15:00 to 12-MAY-11 08:15:00 (CST-6)
Location: WINTER HAVEN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in DE WITT, TEXAS
From 12-MAY-11 11:00:00 to 12-MAY-11 11:00:00 (CST-6)
Location: PETERSVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 52 knots.

Flash Flood in TRAVIS, TEXAS
From 12-MAY-11 11:35:00 to 12-MAY-11 11:35:00 (CST-6)
Location: DEL VALLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorms produced heavy rain which caused flooding in the 8100 block of Posten Lane in Austin.

Thunderstorm Wind in LLANO, TEXAS
From 11-MAY-11 15:35:00 to 11-MAY-11 15:35:00 (CST-6)
Location: KINGSLAND
Magnitude: 48.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 48 knots that knocked down large tree branches and blew the roof off a boat dock.

Hail in LLANO, TEXAS
From 11-MAY-11 15:40:00 to 11-MAY-11 15:40:00 (CST-6)
Location: KINGSLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TRAVIS, TEXAS
From 12-MAY-11 09:08:00 to 12-MAY-11 09:08:00 (CST-6)
Location: AUSTIN BIRDSNEST ARP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A thunderstorm produced pea to nickel size hail and wind gusts estimated at 52 knots.

Thunderstorm Wind in MEDINA, TEXAS
From 12-MAY-11 08:15:00 to 12-MAY-11 08:15:00 (CST-6)
Location: HONDO
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 50 knots which damaged a small portable building and a small utility pole.

Thunderstorm Wind in LEE, TEXAS
From 12-MAY-11 08:30:00 to 12-MAY-11 08:30:00 (CST-6)
Location: NORTHRUP
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A barn roof was partially destroyed by strong thunderstorm winds.  Survey could not find a definitive tornado track so damage is being recorded as strong thunderstorm winds.

Hail in BURNET, TEXAS
From 11-MAY-11 16:30:00 to 11-MAY-11 16:30:00 (CST-6)
Location: BERTRAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LLANO, TEXAS
From 11-MAY-11 17:45:00 to 11-MAY-11 17:45:00 (CST-6)
Location: OXFORD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in LLANO, TEXAS
From 11-MAY-11 18:20:00 to 11-MAY-11 18:20:00 (CST-6)
Location: OXFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced hail from one half inch to golf ball size.

Hail in GILLESPIE, TEXAS
From 11-MAY-11 18:20:00 to 11-MAY-11 18:20:00 (CST-6)
Location: DOSS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced hail from nickel to quarter size.

Thunderstorm Wind in MEDINA, TEXAS
From 12-MAY-11 08:16:00 to 12-MAY-11 08:16:00 (CST-6)
Location: NOONAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A thunderstorm produced wind gusts estimated at 61 knots which snapped off two large mesquite tree limbs.

Hail in DIMMIT, TEXAS
From 12-MAY-11 08:18:00 to 12-MAY-11 08:18:00 (CST-6)
Location: CARRIZO SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in MEDINA, TEXAS
From 12-MAY-11 08:25:00 to 12-MAY-11 08:25:00 (CST-6)
Location: HONDO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A thunderstorm produced wind gusts estimated at 52 knots which caused tree damage city wide in Hondo.

Hail in GILLESPIE, TEXAS
From 11-MAY-11 19:10:00 to 11-MAY-11 19:10:00 (CST-6)
Location: ECKERT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WILLIAMSON, TEXAS
From 11-MAY-11 20:41:00 to 11-MAY-11 20:41:00 (CST-6)
Location: FLORENCE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DIMMIT, TEXAS
From 12-MAY-11 08:32:00 to 12-MAY-11 08:32:00 (CST-6)
Location: CARRIZO SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in TRAVIS, TEXAS
From 12-MAY-11 08:37:00 to 12-MAY-11 08:37:00 (CST-6)
Location: AUSTIN MABRY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BEXAR, TEXAS
From 12-MAY-11 08:45:00 to 12-MAY-11 08:45:00 (CST-6)
Location: HELOTES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in KERR, TEXAS
From 12-MAY-11 06:55:00 to 12-MAY-11 06:55:00 (CST-6)
Location: LEGION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced wind gusts estimated at 52 knots which broke limbs from trees.

Flash Flood in VAL VERDE, TEXAS
From 12-MAY-11 07:00:00 to 12-MAY-11 07:00:00 (CST-6)
Location: JUNO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Thunderstorms produced heavy rain and caused the Devils River to leave its banks at Bakers Crossing. This flooded several low water crossings below Juno.

Hail in HAYS, TEXAS
From 11-MAY-11 21:56:00 to 11-MAY-11 21:56:00 (CST-6)
Location: DRIFTWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in VAL VERDE, TEXAS
From 12-MAY-11 03:30:00 to 12-MAY-11 03:30:00 (CST-6)
Location: DEL RIO DAVIS ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Thunderstorm Wind in KERR, TEXAS
From 12-MAY-11 07:15:00 to 12-MAY-11 07:15:00 (CST-6)
Location: KERRVILLE
Magnitude: 45.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm produced wind gusts estimated at 45 knots which knocked down small tree limbs.

Hail in VAL VERDE, TEXAS
From 12-MAY-11 04:25:00 to 12-MAY-11 04:25:00 (CST-6)
Location: DEL RIO DAVIS ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in EDWARDS, TEXAS
From 12-MAY-11 04:50:00 to 12-MAY-11 04:50:00 (CST-6)
Location: CARTA VLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KINNEY, TEXAS
From 12-MAY-11 05:45:00 to 12-MAY-11 05:45:00 (CST-6)
Location: BRACKETTVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BANDERA, TEXAS
From 12-MAY-11 06:40:00 to 12-MAY-11 06:40:00 (CST-6)
Location: VANDERPOOL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

A thunderstorm produced wind gusts estimated at 50 knots which blew a large tree onto a roof and knocked down a chimney.

Hail in WILLIAMSON, TEXAS
From 11-MAY-11 21:09:00 to 11-MAY-11 21:09:00 (CST-6)
Location: JARRELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced hail from one half to one inch in diameter.

Hail in WILLIAMSON, TEXAS
From 11-MAY-11 21:15:00 to 11-MAY-11 21:15:00 (CST-6)
Location: JARRELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A thunderstorm produced hail from one half to one inch in diameter.

Hail in WILLIAMSON, TEXAS
From 11-MAY-11 21:15:00 to 11-MAY-11 21:15:00 (CST-6)
Location: CORN HILL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser