The following events were reported: Flash Flood, Lightning, Thunderstorm Wind, Tornado. These occurred near station USW00013904, approximately 28.0843 km away, between 2015-05-23 13:20:00 and 2015-05-24 16:30:00.Thankfully, no injuries or fatalities were reported. The events caused property damage valued at 100010000.0 and crop damage of 0.0. Episode Narrative: An upper level shortwave trough moved around the longwave low over the Four Corners region. This upper distubance interacted with a surface boundary moving northward as a warm front from South Texas into a very moist airmass. This combination led to thunderstorms that produced heavy rain and isolated severe weather. A historic flash flood occurred on the Blanco River late Saturday night into Sunday. Hundreds of homes were destroyed along the river from the City of Blanco down into Wimberley and San Marcos. The flood wave continued downstream for days affecting residents and homes along the San Marcos and Guadalupe Rivers. Early estimates show damages in excess of 100 million dollars. Several people lost their lives due to flash flooding. A large tornado outbreak occurred this Saturday night producing numerous small brief tornadoes. An upper level shortwave trough moved around the longwave low over the Four Corners region. Event Narrative: Thunderstorms produced heavy rain that caused flash flooding in Kyle and San Marcos. The majority of the flooding was along the Blanco and San Marcos Rivers. A massive floodwave came down the Blanco River from Wimberley. Huge amounts of debris came with the flood waters. Four people were trapped on a roof awaiting a helicopter rescue in Kyle. I-35 was closed in both directions in San Marcos when the Blanco River flooded and overtopped the interstate. Hwy 80 bridge was also overtopped with flood water just east of I-35. Highway 80 was closed with debris bumping into a bridge structure. Water flooded the Aspen Apartment complex and water was reported to be up to the top of car tires in the parking lot. The Hays County jail in San Marcos was evacuated due to flooding. Many homes along River Road were flooded as well as businesses along the I-35 frontage road as the San Marcos river started to backup into town. All along the Blanco River in Hays County 1515 structures were impacted with 321 houses destroyed and an additional 376 receiving Major damage according to assessments. It is estimated that there were 100 million dollars in insured losses for this flash flood. A thunderstorm produced wind gusts measured at 65 kts by the ASOS at Austin-Bergstrom International Airport. Fairly widespread wind damage was seen east of the airport along Toll Road 130. A thunderstorm produced wind gusts estimated at 70 mph that blew down trees at Hwy 21 and Cardinal Dr. A NWS storm survey team concluded a tornado touched down in the Gabriel's Overlook subdivision in Williamson County, roughly four miles northeast of Leander. The tornado snapped large tree limbs through its path length. The tornado also caused damage to two homes, with roof decking on the corner of one home removed, and over half the roof decking on the second home completely removed. Two large storage sheds were are also picked up and moved 20 yards. Peak winds were estimated at 95-100 mph, where the most significant damage occurred to the second house. A thunderstorm produced wind gusts estimated at 70 mph that damaged a building and pushed some vans across a parking lot. A thunderstorms produced wind gusts estimated at 60 mph that damaged the weather observer office at Austin-Bergstrom International Airport. A thunderstorm produced wind gusts estimated at 70 mph that snapped and uprooted multiple trees. Some of the trees had trunks as large as 12 inches in diameter. Lightning struck a utility pole near the intersection of Lamar Blvd. and Breaker Ln. in Austin and power outages were reported. A NWS survey team concluded a tornado touched down on the west side of I-35 in Austin near Brownie Dr. and Diamondback Trl. The tornado peeled back a sheet metal roof to a business on the west side of the interstate and demolished a stone brick sign. The tornado also caused damage to roofing shingles, snapped large tree limbs and tossed a garbage dumpster at an apartment complex near Hardin Ct. The tornado moved east-northeast, crossing I-35, where it caused significant damage to the second floor of a storage facility. The metal roof and walls were collapsed in on the southwest side of the storage facility. Ten small moving trailers were lifted and tossed in various directions, with two tossed back across to the west side of I-35. Several power poles were blown over along the access roads of the interstate. The tornado continued east-northeast through the Windsor Hills subdivision, snapping numerous large tree limbs throughout the subdivision. Peak winds were estimated at 90-95 mph near the businesses along I-35. A NWS storm survey team found a tornado initially touched down near the intersection of Ranch Road 12 and KC Memory Ln. The tornado traveled to the northeast and crossed FM 150 at Wood Springs. The tornado then crossed E Creek Dr. and lifted before crossing Hwy 290. The damage was primarily to trees, but about 15 homes suffered minor damage. Peak winds were estimated at 85 mph. A NWS storm survey found that an EF-1 tornado initially touched down around Frio Ct, in the River Crossing subdivision producing tree and roof damage at a residence. The tornado moved ENE and crossed several streets in the subdivision. Several trees were uprooted and large oak trees suffered substantial damage. Peak winds were estimated at 95 mph. A NWS storm survey team confirmed an EF-1 tornado touched down on the Sunset Ranch in NW Travis County. The tornado produced tree damage across the ranch. It also hit a residence destroying the front and back porches and damaging the roof. The tornado appears to have dissipated shortly after hitting the residence. Peak winds were estimated at 105 mph. A NWS storm survey found evidence that an EF-0 tornado went through the Shady Hollow area off Brodie Ln. in south Austin. Numerous streets had significant tree damage along with some minor roof damage to some homes. The tornado moved NE and appears to have dissipated near W Slaughter Ln. Wind damage was reported farther NE into the city of Austin, but this damage could not conclusively be associated with this tornado path. A thunderstorm produced wind gusts estimated at 70 mph that blew down power lines in the 10200 block of the N I-35 service road. Thunderstorms produced heavy rain that caused flash flooding requiring water rescues near the Gary Job Corps Center. A thunderstorm produced wind gusts estimated at 70 mph that partially collapsed the roof of an apartment building near Tech Ridge Blvd. and I-35. A thunderstorm produced wind gusts estimated at 70 mph that blew down power lines on Rutherford Ln. near Furness Dr. in Austin. Thunderstorms produced heavy rain that caused flash flooding. There were multiple water rescues across the county with numerous roads closed. Across the county 1400 structures were impacted by flooding with 50 homes destroyed. It is estimated that the flooding this night caused 100 million dollars in insured losses from Blanco down through Martindale. Uninsured losses will likely top 7 million in Caldwell County alone. A thunderstorm produced wind gusts estimated at 60 mph that caused some roof damage. A thunderstorm produced wind gusts estimated at 70 mph that blew down some trees on Old Manor Rd. There was severe flooding in Wimberley where people were stranded on rooftops. A NWS storm survey found evidence of a weak EF-0 tornado that initially touched down near FM 1431 and produced damage at a school. The tornado traveled northeast and caused considerable tree damage in the Indian Hills subdivision before dissipating right near the Williamson County line. Other wind damage was observed near New Hope Dr., but could not conclusively be associated with this tornado path.