A mesoscale convective vortex near Laredo brought thunderstorms into South Central Texas. The airmass was very moist and some storms produced heavy rain the led to flash flooding.
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The episode as NWS EWX wrote it up.
A mesoscale convective vortex near Laredo brought thunderstorms into South Central Texas. The airmass was very moist and some storms produced heavy rain the led to flash flooding. Portions of NW and W Bexar Country received 5-10 inches of rain that morning which flooded Leon Creek.
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 Jul 6, 5:48 AM CST, 9 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Austin/San Antonio TX 648 AM CDT Tue Jul 6 2021 .UPDATE... Made a quick update to increase PoPs across the south and southwestern areas as rain continues to increase and expand in area coverage. && .PREV DISCUSSION... /ISSUED 331 AM CDT Tue Jul 6 2021/ SHORT TERM (Today through Wednesday)... The Mesoscale Convective System that pushed across the Rio Grande and aided in the localized heavy rain activity over our area yesterday afternoon and evening is now moving toward Deep South Texas. A mesoscale convective vortex could be identified using IR and water vapor channels between northeast Mexico and south of Laredo. The reflection of this feature goes down to the lower atmosphere with surface observations supporting a low pressure over the western part of Corpus Christi CWA and northwest Brownsville CWA. With abundant and rich tropical moisture being transported across the Coastal Plains and into our area early this morning, expect scattered to numerous shower and thunderstorm activity to increase and expand in coverage through the mid morning hours. Any strong showers or storms are capable of producing heavy rain and could lead to localized flooding. Pwats values are running between 2.2 to 2.4 inches based on the SPC Mesoscale Analysis page, with GFS model showing up to 2.5 inches near the middle Texas coast. The Weather Prediction Center is carrying a slight risk for excessive rainfall on their ERO Day 1, mainly along and south of a Hallettsville to Floresville to Pearsall line. This matches well where highest pwats reside and the best convergence area is expected to occur for most of today. However, pockets of heavy rain could happen outside of the ERO Day 1 slight risk this afternoon and early evening. The shower and thunderstorm activity should decrease this evening into overnight hours as it is diurnally driven. However, activity begins to pick up during the overnight hours into Wednesday morning across the middle Texas coast and then into our area as a surface trough develops along the Texas coast. Therefore, another round of moderate to heavy rain is likely on Wednesday across the Coastal Plains and areas along and east of Interstate 35. Temperatures will stay below climate normals during this wet and cloudy pattern. LONG TERM (Wednesday Night through Monday)... There are still significant differences indicated in the mid and upper level pattern between the 00Z operational runs of the GFS, ECMWF, and CMC late this week and over the weekend, which is making for a lower confidence forecast in placement of PoPs. The GFS continues to maintain a weaker 700-500mb inverted trough axis along the coast Wednesday, that drifts northwest Thursday through the weekend over the area. The ECMWF and CMC continue to close off a mid and upper level low, with the ECMWF drifting it west into Mexico and the CMC northwest up the Rio Grande Thursday through the weekend. Because of this the ECMWF's, and more so the CMC's, low level reflection is stronger. This is resulting in focused banding of heavy precip with the ECMWF Thursday and Friday across South Texas and Mexico and with the CMC Thursday across South Texas, Friday across our southern counties, and over the weekend across our western counties. The GFS maintains more of a scattered type nature to the convection across our area. Given the uncertainty, at this time we are following close to the NBM PoPs until some better clarity occurs in the models. With that said, in general 2 to 4" of rainfall is advertised the remainder of this week across the southern half of the CWA, with 1/2 to 2 inches across the northern half of the CWA, and a caveat that this is highly conditional on the eventual evolution of the mid and upper level trough/low. Pockets of higher amounts over 6" inches remain possible. These isolated pockets could occur in a short period of time. Thus, we will continue to advertise a threat for localized flooding concerns through the week. With respect to temperatures, forecast max temperatures will continue to remain below normal for this time of year, welcome news for most given it's July. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 87 73 88 72 89 / 70 30 70 20 50 Austin Bergstrom Intl Airport 86 72 88 71 89 / 70 30 70 20 60 New Braunfels Muni Airport 86 73 87 72 89 / 70 30 70 20 60 Burnet Muni Airport 84 71 87 70 88 / 60 30 50 10 40 Del Rio Intl Airport 88 74 89 73 90 / 60 40 60 30 40 Georgetown Muni Airport 86 72 87 70 89 / 60 30 50 10 40 Hondo Muni Airport 83 72 85 71 86 / 80 40 70 30 60 San Marcos Muni Airport 86 72 87 71 88 / 70 30 70 20 60 La Grange - Fayette Regional 87 73 87 73 89 / 70 40 70 20 70 San Antonio Intl Airport 84 73 86 73 87 / 80 40 70 20 60 Stinson Muni Airport 85 74 86 74 87 / 80 40 70 20 60 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Short-Term/Aviation...17 Long-Term...Runyen Decision Support...Treadway
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 345 AM CDT Tue Jul 6 2021 TXZ171>173-183>194-202>209-217>225-228-070845- 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- 345 AM CDT Tue Jul 6 2021 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Scattered to numerous showers and scattered thunderstorms are expected early this morning across the Coastal Plains and south and southwest counties and most areas this afternoon and early evening. Cloud to ground lightning will be possible in and near any storms. In addition, a few storms could produce localized flooding and strong gusty winds. No other hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered showers and thunderstorms are forecast Wednesday through Sunday, especially in the afternoon and evening hours. Cloud to ground lightning will be possible in and near any storms. In addition, a few storms could produce localized flooding as well as strong gusty winds. No other hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The Austin/San Antonio radar (KEWX), 67 km away, was scanning. The volume nearest the first event began at 11:57 UTC.
5 flash flood, 1 flood. Local standard time, as filed.
Thunderstorms produced heavy rain that led to flash flooding. Bexarflood.org reported that a low water crossing on Leslie Rd. in northwestern San Antonio was closed due to flooding.
Thunderstorms produced heavy rain that led to flash flooding. An mPing user reported street flooding near I-10 and Vance Jackson Rd. in northwestern San Antonio.
Thunderstorms produced heavy rain that led to flash flooding. There was water over the roads at Toutant Beauregard Rd. and Wild Sage near Pecan Creek. Rainfall in the area was over 2.5 inches in one hour.
Thunderstorms produced heavy rain that led to flash flooding. There was water over the road on Cielo Vista Dr. south of Vista Mountain Dr. Rainfall in the area was over 2.5 inches in one hour.
Several homes near Heath Road and Dhaka View flooded. There were reports of 1 to 2 feet of water in a few of the residences.
Media video and USGS gauge LKST2 data indicated that major flooding occurred at the Leon Creek gauge at I-35. The gauge peaked at 25.79 feet, the 4th highest crest. The high water closed that portion of I-35 as water started to encroach the lanes at the entrances of the highway bridge. Farther upstream where Leon Creek crosses the New Laredo Highway, a business close to the creek took on some water damage and a nearby mobile home park was evacuated as high water made the roads in the park impassable.
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, July 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: 972224, 972226, 972250, 972256, 972360, 972396.