An upper level area of low pressure moved across the southern plains and interacted with a dryline to produce severe thunderstorms on successive days. The severe weather was over the eastern part of the forecast area. The strongest storms were on May 21st with a tornado and record setting hail.

Thunderstorm Wind in TRAVIS, TEXAS
From 20-MAY-11 19:10:00 to 20-MAY-11 19:10:00 (CST-6)
Location: AUSTIN MABRY
Magnitude: 40.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced wind gusts estimated at 40 knots which caused tree damage in the Allandale neighborhood of Austin.

Hail in BURNET, TEXAS
From 21-MAY-11 19:40:00 to 21-MAY-11 19:40:00 (CST-6)
Location: BURNET CRADDOCK ARPT
Magnitude: 5.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced a measured five inch diameter hailstone which ties the record for the largest hailstone ever reported in South Central Texas.

Thunderstorm Wind in WILLIAMSON, TEXAS
From 21-MAY-11 19:57:00 to 21-MAY-11 19:57:00 (CST-6)
Location: ANDICE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A thunderstorm produced wind gusts to an estimated 50 knots which caused damage to mobile homes and blew down some fences in and around Andice.

Tornado in WILLIAMSON, TEXAS
From 21-MAY-11 20:00:00 to 21-MAY-11 20:05:00 (CST-6)
Location: ANDICE
Tornado F-scale: EF0
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The National Weather Service conducted a damage survey near the Andice area in western Williamson County. Talking to several local residents have brought the conclusion that the initial spin up of the weak tornado occurred around 9pm and
lasted probably 5 minutes as it tracked to the North Northeast. Residents to the southeast of Andice reported seeing a lot of circulation under the storm with several different funnels. Damage was first seen just to the south of ranch road 2338 about 1.5 miles SSE of Andice. Minor damage to several mobile homes occurred at this   area including a carport and deck which were destroyed. The tornado crossed Ranch Road 2338 and went NNE and crossed county roads 250 and 251. Several areas of tree damage were noted. Two residences along County Road 251 experienced damage including a screened in porch that was tossed over the house. Large hay bales were also found in the road...being rolled many yards from their original location. There were no deaths or injuries.  Maximum winds are estimated to have been 80 MPH.

Hail in CALDWELL, TEXAS
From 20-MAY-11 20:01:00 to 20-MAY-11 20:01:00 (CST-6)
Location: LARREMORE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in BASTROP, TEXAS
From 20-MAY-11 20:15:00 to 20-MAY-11 20:15:00 (CST-6)
Location: BUTLER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BASTROP, TEXAS
From 20-MAY-11 20:17:00 to 20-MAY-11 20:17:00 (CST-6)
Location: ELGIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BASTROP, TEXAS
From 20-MAY-11 20:25:00 to 20-MAY-11 20:25:00 (CST-6)
Location: BUTLER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BASTROP, TEXAS
From 20-MAY-11 21:17:00 to 20-MAY-11 21:17:00 (CST-6)
Location: CEDAR CREEK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BASTROP, TEXAS
From 20-MAY-11 21:16:00 to 20-MAY-11 21:26:00 (CST-6)
Location: CEDAR CREEK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced pea to penny size hail for 10 minutes.

Hail in BASTROP, TEXAS
From 20-MAY-11 21:32:00 to 20-MAY-11 21:32:00 (CST-6)
Location: ROCKNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CALDWELL, TEXAS
From 20-MAY-11 21:50:00 to 20-MAY-11 21:50:00 (CST-6)
Location: LOCKHART
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LLANO, TEXAS
From 21-MAY-11 17:12:00 to 21-MAY-11 17:12:00 (CST-6)
Location: TOW
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 21-MAY-11 17:12:00 to 21-MAY-11 17:12:00 (CST-6)
Location: BUCHANAN LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 21-MAY-11 17:48:00 to 21-MAY-11 17:48:00 (CST-6)
Location: BRIGGS
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in BURNET, TEXAS
From 21-MAY-11 17:49:00 to 21-MAY-11 17:49:00 (CST-6)
Location: BUCHANAN LAKE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILLIAMSON, TEXAS
From 21-MAY-11 17:54:00 to 21-MAY-11 17:54:00 (CST-6)
Location: FLORENCE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BURNET, TEXAS
From 21-MAY-11 18:11:00 to 21-MAY-11 18:11:00 (CST-6)
Location: BERTRAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in BURNET, TEXAS
From 21-MAY-11 18:26:00 to 21-MAY-11 18:26:00 (CST-6)
Location: MAHOMET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in BURNET, TEXAS
From 21-MAY-11 18:30:00 to 21-MAY-11 18:30:00 (CST-6)
Location: BURNET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in BURNET, TEXAS
From 21-MAY-11 19:30:00 to 21-MAY-11 19:30:00 (CST-6)
Location: BUCHANAN LAKE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 21-MAY-11 19:36:00 to 21-MAY-11 19:36:00 (CST-6)
Location: BURNET CRADDOCK ARPT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BURNET, TEXAS
From 21-MAY-11 19:42:00 to 21-MAY-11 19:42:00 (CST-6)
Location: BUCHANAN LAKE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in BURNET, TEXAS
From 21-MAY-11 19:48:00 to 21-MAY-11 19:48:00 (CST-6)
Location: BURNET CRADDOCK ARPT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Funnel Cloud in WILLIAMSON, TEXAS
From 21-MAY-11 19:53:00 to 21-MAY-11 19:53:00 (CST-6)
Location: ANDICE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A funnel cloud was observed by a member of the Florence Fire Department.

Hail in BURNET, TEXAS
From 21-MAY-11 19:53:00 to 21-MAY-11 19:53:00 (CST-6)
Location: BURNET CRADDOCK ARPT
Magnitude: 2.40 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURNET, TEXAS
From 21-MAY-11 19:59:00 to 21-MAY-11 19:59:00 (CST-6)
Location: BURNET CRADDOCK ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 21-MAY-11 20:24:00 to 21-MAY-11 20:24:00 (CST-6)
Location: BERTRAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in LLANO, TEXAS
From 20-MAY-11 13:29:00 to 20-MAY-11 13:29:00 (CST-6)
Location: BABY HEAD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURNET, TEXAS
From 20-MAY-11 14:30:00 to 20-MAY-11 14:30:00 (CST-6)
Location: LAKE VICTOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 20-MAY-11 15:15:00 to 20-MAY-11 15:15:00 (CST-6)
Location: LAKE VICTOR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURNET, TEXAS
From 20-MAY-11 15:21:00 to 20-MAY-11 15:21:00 (CST-6)
Location: LAKE VICTOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in TRAVIS, TEXAS
From 20-MAY-11 18:51:00 to 20-MAY-11 18:51:00 (CST-6)
Location: BEECAVES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HAYS, TEXAS
From 20-MAY-11 18:55:00 to 20-MAY-11 18:55:00 (CST-6)
Location: DRIFTWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in HAYS, TEXAS
From 20-MAY-11 18:54:00 to 20-MAY-11 18:59:00 (CST-6)
Location: MT GAYNOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced pea to penny size hail for five minutes on County Road 191 west of Ranch Road 12.

Hail in TRAVIS, TEXAS
From 20-MAY-11 19:11:00 to 20-MAY-11 19:11:00 (CST-6)
Location: BEECAVES
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HAYS, TEXAS
From 20-MAY-11 19:18:00 to 20-MAY-11 19:18:00 (CST-6)
Location: DRIFTWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HAYS, TEXAS
From 20-MAY-11 19:20:00 to 20-MAY-11 19:20:00 (CST-6)
Location: MT GAYNOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in HAYS, TEXAS
From 20-MAY-11 19:32:00 to 20-MAY-11 19:32:00 (CST-6)
Location: DRIFTWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HAYS, TEXAS
From 20-MAY-11 19:50:00 to 20-MAY-11 19:50:00 (CST-6)
Location: DRIFTWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public