Above normal rainfall during September improved drought conditions across South Central Texas. Uvalde County recovered from Extreme (D3) to Severe (D2) Drought and Zavala County remained in D2.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
Above normal rainfall during September improved drought conditions across South Central Texas. Uvalde County recovered from Extreme (D3) to Severe (D2) Drought and Zavala County remained in D2. Uvalde was under Stage 1 water restrictions. Zavala had an outdoor burn ban in effect.
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 Aug 31, 5:26 PM CST, 6 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 626 PM CDT Mon Aug 31 2020 .AVIATION... Line of showers and storms northwest of DRT is expected to weaken before reaching DRT this evening. Breezy conditions across TAF sites this evening and expected to persist late tonight with sustained south to southeasterly winds around 12 to 15 mph and gusts upwards of 20 mph. Winds relax slightly overnight and MVFR ceilings look to build in for all sites. There certainly is enough moisture pooled over the region to support IFR ceilings but the limiting factor will be elevated winds. If winds can relax enough early tomorrow morning, could see patches of IFR develop just before daybreak, most likely for I-35 sites. VFR ceilings return tomorrow as well as another breezy day. && .PREV DISCUSSION... /ISSUED 250 PM CDT Mon Aug 31 2020/ SHORT TERM (Tonight through Tuesday Night)... Heat advisory conditions continue through Tuesday. The Heat Advisory has been extended through 8 PM Tuesday for all of South Central Texas with the exception of the western Hill Country. Heat index values are forecast to range from 108 to 112 degrees, with isolated spots reaching 113 to 115 on Tuesday afternoon. In the meantime, there is a slight chance for storms across the far southeast part of the region through early this evening. Another area of interest for this evening could be found across the Trans- Pecos if storms do develop ahead of a surface trough. HiRes models have been picking up on this feature for the last several runs and bring isolated storms across far northwest Val Verde County. By Tuesday as you all know, the heat is back on. However, an upper level disturbance is forecast to drop from the Four Corners region into the Southern Plains on Tuesday and into Central Texas by Wednesday. This feature, in combination with abundant tropical moisture in place and moderate instability, is forecast to produce scattered to numerous showers and thunderstorms as early as late Tuesday afternoon across the northwest part of the local area. HiRes models are in good agreement on a large storm complex dropping across the Hill Country on Tuesday night. SPC Convective Outlook Day 2 highlights a Marginal Risk of severe storms along and northwest of a Georgetown to Medina to Del Rio line. The main hazard for this period is likely to be strong to damaging wind gusts. Also, can't rule out isolated flash flooding as pwats are forecast to be running around 2.0 to 2.25 inches, especially across the northern part of the Hill Country. The storm complex could push across some portions of the I-35 corridor late Tuesday night through Wednesday morning. LONG TERM (Wednesday through Monday)... Wednesday's forecast will be highly conditional on what happens with the convective evolution Tuesday night. There may be ongoing organized storms to start the day Wednesday across portions of the CWA, however convective allowing models vary considerably in the location of where this occurs. The greatest chances look to occur from Central Texas and the northern Hill Country, trailing back to the southwest, closer to the mid level forcing in the southwest flow aloft. But of course mesoscale influences will likely play a role on Wednesday's forecast. The struggles continues with the upper level pattern solution in the long term, and the forecast confidence Wednesday and beyond remains low. The 12Z GFS continues to be the farthest east with the upper level trough, reaching Arkansas and East Texas by Thursday night before retrograding back southwest over the weekend. The 12Z ECMWF, Canadian, UKMET, and NAM are farther west with the trough, with the ECMWF eventually having the closed low slide south into portions of the southern Edwards Plateau by Thursday night before retrograding back west toward the Big Bend on Friday. The eventual evolution of the closed low and trough will have a big influence on timing and placement of showers and storms Wednesday night through Saturday. It appears the high PoPs Wednesday night may remain west of I-35, but Thursday through Saturday may expand through much of the CWA. PoPs will remain capped at less than 50% for the time being until forecast confidence in the upper level pattern increases. With the lower heights and trough over Texas, as well as increased cloud cover and rain chances, temperatures won't be as oppressive as recent, with high temperatures cooling into the low to mid 90s by Friday and continuing into the weekend. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 81 100 78 97 77 / - 10 20 40 30 Austin Bergstrom Intl Airport 81 99 77 97 76 / - 10 20 30 20 New Braunfels Muni Airport 81 99 77 98 77 / - - 20 30 20 Burnet Muni Airport 79 98 75 92 74 / - 20 40 50 40 Del Rio Intl Airport 82 102 79 97 77 / - 20 50 30 40 Georgetown Muni Airport 81 100 77 96 76 / - 10 30 50 30 Hondo Muni Airport 80 102 77 100 75 / 0 - 30 30 30 San Marcos Muni Airport 80 99 77 98 76 / - - 20 30 20 La Grange - Fayette Regional 81 100 80 100 78 / 10 - - 10 10 San Antonio Intl Airport 81 100 78 99 77 / - - 20 30 20 Stinson Muni Airport 81 100 79 99 78 / - - 20 30 20 && .EWX WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 8 PM CDT Tuesday for Atascosa-Bandera-Bastrop- Bexar-Blanco-Burnet-Caldwell-Comal-De Witt-Dimmit-Fayette-Frio- Gonzales-Guadalupe-Hays-Karnes-Kendall-Kinney-Lavaca-Lee-Llano- Maverick-Medina-Travis-Uvalde-Val Verde-Williamson-Wilson-Zavala. && Short-Term/Aviation...EWilliams Long-Term...Platt
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 235 PM CDT Mon Aug 31 2020 TXZ171>173-183>194-202>209-217>225-228-020100- 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- 235 PM CDT Mon Aug 31 2020 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...This Afternoon And Tonight. A Heat Advisory is in effect for all of South Central Texas except higher elevations in the Hill Country and Edwards Plateau. Expect Heat index values of 108 to 113. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. A Heat Advisory will be in effect until 8 pm on Tuesday for all of South Central Texas except higher elevations in the Hill Country and Edwards Plateau. Expect Heat index values of 109 to 114. There is a marginal risk for severe storms late Tuesday night across the Edwards Plateau and Hill Country. A few storms could become severe, producing damaging winds. Brief, heavy rain is also possible with some storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The national radar mosaic for the moment the first event began.
2 drought. Local standard time, as filed.
Above normal rainfall during September improved drought conditions across South Central Texas. Uvalde County recovered from Extreme (D3) to Severe (D2) Drought and Zavala County remained in D2. Uvalde was under Stage 1 water restrictions. Zavala had an outdoor burn ban in effect.
Above normal rainfall during September improved drought conditions across South Central Texas. Uvalde County recovered from Extreme (D3) to Severe (D2) Drought and Zavala County remained in D2. Uvalde was under Stage 1 water restrictions. Zavala had an outdoor burn ban in effect.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2020Every state in 2020This day in weather historyWarnings in Texas, September 2020
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: 920846, 920847.