Showers and thunderstorms formed in the vicinity of a stationary front and produced isolated heavy rain resulting in one flash flooding report.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS EWX wrote it up.
Showers and thunderstorms formed in the vicinity of a stationary front and produced isolated heavy rain resulting in one flash flooding report.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Austin/San Antonio, TX wrote its last area forecast discussion before the first event at May 30, 5:40 PM CST, 58 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Austin/San Antonio TX 640 PM CDT Sun May 30 2021 .AVIATION...00Z TAF package KAUS currently is under a thunderstorm producing heavy rainfall, lightning and reduced visibility as low as 1 SM. This activity remains possible until about 01Z before this convection advances north-northwestward. Elsewhere, VFR conditions are ongoing but wouldn't rule out a shower around KSAT or KSSF over the next few hours. Clouds will increase and thicken overnight into Monday morning with development of IFR to MVFR ceilings. Ceilings will gradually improve late Monday morning and into the afternoon. Expect light to moderate east-southeasterly winds with the conditions becoming rather gusty to around 20 knots at times, especially at KDRT. KAUS and KSAT can expect the redevelopment of MVFR ceilings Monday night as ceilings lower. && .PREV DISCUSSION... /ISSUED 240 PM CDT Sun May 30 2021/ SHORT TERM (Tonight through Monday Night)... Isolated to scattered showers continue across much of the area with the highest coverage south of the San Antonio metro in Atascosa, Wilson, and Karnes County. Have not seen a lot of lightning with this activity but with nearly 1500 J/kg of MLCAPE available per latest mesoanalysis, should see an uptick of lightning through the early afternoon. This activity should continue through 6-7 PM then begin to wane with the loss of daytime heating. Most of the overnight period should be quiet with some low PoPs out west for some possible activity moving in from West Texas. Lows tonight will be in the upper 60s to lower 70s for most locations. For tomorrow, isolated showers and storms will once again be possible for most locations with perhaps some drier conditions for the Coastal Plains. Should see a higher coverage of activity in the late afternoon through the late evening hours as activity from the west makes it into our CWA. Some of this activity could be strong to severe. The latest Day 2 outlook from SPC has the western areas in a slight risk (2/5 risk) and a marginal risk (1/5) stretching east into the I35 corridor. Strong winds and large hail will be the main threats, but an isolated tornado can't be ruled out across mainly the western areas. Highs Monday will be in the 80s with lows Monday night in the upper 60s to lower 70s once again. LONG TERM (Tuesday through Sunday)... Our stretch of active weather will continue into the first week of June as an upper level low over the northern Baja of California becomes cutoff from the large scale flow, sending a series of shortwave disturbances through South-Central Texas. Rainfall totals of between 5 to 10 inches have been widespread for the month of May, with some spots seeing as much as 20 inches already this month. The wet pattern doesn't seem to want to let up anytime soon, with an active southern stream jet expected through the next couple weeks. Tuesday morning, at the tail end of latest 12Z CAMs, a complex of thunderstorms will attempt to work its way into the western and northwestern CWA and approach the I-35 corridor by mid to late morning before weakening. The timing between this and possible afternoon convection will be key. If storms are in the area and don't move out before lunchtime, afternoon clearing/destabilization is less likely over the western zones. At the moment, believe that storms will re-fire by late afternoon out over the Rio Grande along the dryline and advance eastward through the evening hours on Tuesday. Isolated strong to severe storms are possible with large hail and damaging winds, as the SPC has a Marginal Risk in place for most of the area on Tuesday. However, the primary risk appears to once again be heavy rain which could quickly lead to flooding/flash flooding, especially given area river and creeks are heavily stressed due to all the recent rainfall. It won't take much to lead to flooding, as area rivers are already above normal flow. Wednesday will see a similar setup with respect to timing, as storms will once again attempt to fire up once again over the Rio Grande and push eastward during the afternoon, organizing into a complex that moves into the I-35 corridor by mid to late evening. The primary threat will once again be heavy rain which could quickly lead to flooding. GEFS and ECMWF Ensemble PWATs are 125%-150% of normal for early June, so moisture will be anything but lacking. There are signs that the cutoff low over the northern Baja of California will finally get kicked eastward by next weekend, however, daily thunderstorm chances will continue through this entire forecast package, but pinpointing exact timing of heaviest storms are where the heaviest rain will fall is still difficult to determine given mesoscale influences each day. PREV DISCUSSION... /ISSUED 1235 PM CDT Sun May 30 2021/ AVIATION... Isolated to scattered showers have developed across much of the area this afternoon. Will show VCSH in the I35 TAF sites through the early evening hours to account for this activity. Can't completely rule out a stray thunderstorm with this activity but chances of that were too low to mention at this time. Will amend as necessary for any possible thunderstorm development near a terminal. Otherwise, MVFR/IFR ceilings are once again expected overnight into tomorrow morning with a slow improvement back into VFR by the early afternoon. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 70 85 71 85 69 / 20 20 20 40 40 Austin Bergstrom Intl Airport 71 85 71 85 69 / 20 20 20 40 40 New Braunfels Muni Airport 70 87 71 87 70 / 20 20 10 40 40 Burnet Muni Airport 68 82 68 83 67 / 20 20 30 50 50 Del Rio Intl Airport 72 86 73 85 70 / 10 20 30 50 60 Georgetown Muni Airport 69 83 70 84 67 / 20 20 20 50 50 Hondo Muni Airport 72 86 71 86 69 / 10 20 20 40 50 San Marcos Muni Airport 70 85 70 86 69 / 20 20 10 40 40 La Grange - Fayette Regional 72 87 72 87 71 / 20 10 - 40 30 San Antonio Intl Airport 72 85 71 85 70 / 20 20 20 40 40 Stinson Muni Airport 72 88 72 88 72 / 10 20 20 40 40 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Short-Term/Aviation...Brady Long-Term...04 Decision Support...Oaks
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 427 AM CDT Sun May 30 2021 TXZ171>173-183>194-202>209-217>225-228-310930- Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera- Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde- Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala- Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit- 427 AM CDT Sun May 30 2021 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Isolated thunderstorms are possible across the Interstate 35 including Austin and San Antonio metro areas this afternoon. If these storms do develop, they could produce cloud to ground lightning strikes and heavy downpours resulting in ponding of waters over roadways or minor flash flooding over locations where rainfall from previous days are still present. No other hazardous weather is expected at this time for the period. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Several rounds of showers and thunderstorms are expected on Monday afternoon into the evening hours and once again on Tuesday and Wednesday afternoons into the evenings. Some of these storms could be strong to severe with main weather hazards being large hail and damaging winds. A tornado or two can't be ruled out. Localized flash flooding is also a concern due to previous rain events the past week or so. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any severe weather or flooding to the National Weather Service.
The Austin/San Antonio radar (KEWX), 58 km away, was scanning. The volume nearest the first event began at 00:39 UTC.
1 flash flood. Local standard time, as filed.
Thunderstorms produced heavy rain that led to flash flooding. Marble Creek sent over a foot of water over the roadway at the 6700 block of Colton-Bluff Springs Rd. in southern Austin.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2021Every state in 2021This day in weather historyWarnings in Texas, May 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 960679.