Event narrative (NOAA)
Thunderstorms produced heavy rain that caused flash flooding in and around San Antonio and Bexar County. There was record rainfall in the San Antonio area with the San Antonio International Airport recording 9.87 inches of rain (2nd highest 24 hr total on record) and CoCoRAHS observers reporting over 11 inches. Most of the rain fell in about six hours with four inches in one hour between 6 and 7 AM. A USGS stream and rain gauge on Olmos Creek and Dresden Drive reported 2.58 inches in 15 min between 615 and 630 am. The gauge reported 6.13 inches in one hour, 9.46 inches in 2 hours, and totaled 15.31 inches in 5 hours. A 24hr total at this gauge was 17 inches of rain. This led to massive flooding in the Olmos Basin/Creek just inside Loop 410 near the Quarry. Most of the flooding across
Other notable flash flood events in Texas
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.