The remnants of Pacific Tropical Storm Pilar moved across Mexico adding mid-level moisture to an already moist boundary layer. 5 inches when a series of upper level shortwave troughs initiated thunderstorms.
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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.
The remnants of Pacific Tropical Storm Pilar moved across Mexico adding mid-level moisture to an already moist boundary layer. Precipitable water values were around 2.5 inches when a series of upper level shortwave troughs initiated thunderstorms. Some of these storms produced heavy rainfall that led to flash flooding.
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 Sep 26, 5:51 AM CST, 1 hour 9 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 651 AM CDT Tue Sep 26 2017 .AVIATION... CIGs are varying between VFR and IFR at this time. All airports will be MVFR/IFR by around 13Z. Intermittent rain showers will move through the San Antonio and Del Rio areas over the next several hours. Showers and thunderstorms will develop again during the day today, but timing is uncertain. Convection will likely lower conditions by one category. && .PREV DISCUSSION... /ISSUED 327 AM CDT Tue Sep 26 2017/ SHORT TERM (Today through Wednesday)... A large area of rain with embedded thunderstorms continues mainly across areas west of Highway 281. Heavier convection developed yesterday evening across the southwest CWA and has since moved to the southeast following the best instability axis. The HRRR has had a decent handle on the precip overnight and shows it lingering into the late morning hours with a slow eastward progression continuing. Think this trend from the model seems decent and will follow this closely in the near-term, showing high PoPs across the south in the morning hours with increasing PoPs out west this afternoon. Little has changed regarding the synoptic setup versus yesterday with the base of the deep trough remaining over the southwest CONUS with southwest flow aloft in place across South-Central Texas. Southeast flow from the surface up to 700 mb is aiding in the lift as isentropic upglide and this will ensure continued chances of periods of showers and thunderstorms beyond this morning for the remainder of the short-term forecast. The highest PoPs will remain across the western CWA in the best region of this low-level lift and any responses from perturbations within the southwest flow. For the most part, think the heavy rainfall chances will be limited in the short- term without the presence of a surface boundary and significant upper forcing. Will have to watch for the development of any MCVs that would aide in the rainfall production. Think there could be some advisories or an occasional Flash Flood Warning needed in the short- term, but not expecting wide-spread flooding. High temperatures will be in the 80s to near 90 degrees with a low tonight in the lower 70s across much of the area. LONG TERM (Wednesday Night through Monday)... On Wednesday night, the cold front currently in northern Oklahoma and the Texas Panhandle will be approaching our northern counties and will move move into the area by Thursday afternoon. This boundary with the similar synoptic setup should allow for an uptick in the intensity of rainfall across our western counties as it serves as a focus for continued shower and storm development. The ECMWF is showing this quite well with a QPF bullseye across the western counties on Thursday. The overall threat of Flash Flooding should be highest then, especially if we do get several rounds of rain over the next couple of days which will help saturate the top soil and allow for sufficient runoff for flash flooding. Additional storm total rainfall amounts through Thursday will be 4-6 inches across the western counties with isolated totals up to 10 inches. Lesser amounts can be expected for the remainder of the CWA. Once the front pushes through the area by the evening hours on Thursday, the threat for heavy rainfall will diminish. Will end PoPs Saturday night with lingering low chances of rain behind the cold front on Friday. Temperatures behind the front will be much cooler with highs this weekend in the 80s and lows in the 50s/60s. The GFS shows a weak disturbance bringing rain to the area on Monday, but the ECMWF does not show this. Will forecast a 20 PoP for the much of the area for now. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 88 72 87 71 87 / 60 40 40 30 40 Austin Bergstrom Intl Airport 88 71 87 71 88 / 50 40 30 30 30 New Braunfels Muni Airport 87 72 88 71 88 / 70 40 40 40 40 Burnet Muni Airport 83 69 82 68 81 / 60 50 50 40 40 Del Rio Intl Airport 84 72 83 70 84 / 90 90 80 70 60 Georgetown Muni Airport 87 71 86 70 85 / 60 40 40 40 30 Hondo Muni Airport 88 72 89 71 89 / 90 70 70 60 40 San Marcos Muni Airport 88 71 87 71 88 / 60 40 40 30 40 La Grange - Fayette Regional 90 72 90 73 90 / 40 20 20 20 20 San Antonio Intl Airport 86 73 87 72 87 / 80 50 50 40 40 Stinson Muni Airport 86 73 87 72 88 / 80 50 50 40 40 && .EWX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch through Thursday evening for the following counties: Bandera...Dimmit...Edwards...Frio...Kerr...Kinney... Maverick...Medina...Real...Uvalde...Val Verde...Zavala. && Mesoscale/Aviation...05 Synoptic/Grids...Hampshire
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 507 AM CDT Tue Sep 26 2017 TXZ171>173-183>194-202>209-217>225-228-271015- 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- 507 AM CDT Tue Sep 26 2017 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. Locally heavy rain may lead to flash flooding. A Flash Flood Watch is in effect for the area along and west of a line from Kerrville to Dilley. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Locally heavy rain may lead to flash flooding through Thursday evening. A Flash Flood Watch is in effect for the area along and west of a line from Kerrville to Dilley. Otherwise no hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Please report any heavy rain or flooding.
The Laughlin AFB radar (KDFX), 120 km away, was scanning. The volume nearest the first event began at 12:58 UTC.
4 flash flood, 4 flood. Local standard time, as filed.
Thunderstorms produced heavy rain that led to flash flooding requiring several people to be rescued from an oil field site and closing many ranch roads around Catarina.
Thunderstorms produced heavy rain that led to flooding closing SH 85 between Dilley and Big Wells.
Thunderstorms produced heavy rain that led to flooding closing FM 117 northwest of Divot.
Thunderstorms produced heavy rain that led to flooding closing FM 2688 in both directions west of Catarina.
Thunderstorms produced heavy rain that led to flooding closing FM 481 from SH 57 toward Uvalde.
Thunderstorms produced heavy rain that led to flash flooding closing FM 334 about a mile east of Live Oak Rd. along the West Nueces River northwest of Uvalde.
Thunderstorms produced heavy rain that led to flash flooding closing CR 1866 at the Leona River southeast of Batesville.
Thunderstorms produced heavy rain that led to flash flooding closing several roads in northern Zavala County including FM 117 and FM 140.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2017Every state in 2017This day in weather historyWarnings in Texas, September 2017
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: 722644, 723078, 723079, 723080, 723082, 722642, 722643, 722649.