An upper low over the Lower Mississippi River valley and a stationary boundary combined to generate an area of showers and thunderstorms in Central Texas. These storms moved into South Central Texas and some produced damaging wind gusts.
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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.
An upper low over the Lower Mississippi River valley and a stationary boundary combined to generate an area of showers and thunderstorms in Central Texas. These storms moved into South Central Texas and some produced damaging wind gusts.
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 22, 3:04 AM CST, 1 hour 10 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 404 AM CDT Sat Aug 22 2020 .SHORT TERM (Today through Sunday)... A mid and upper level disturbance is pushing down from Central Texas into the Hill Country early this morning. Latest infrared satellite images show two storm complexes (one over the southern portion of San Angelo CWA and the other to the southwest of the Forth Worth/Dallas area). The most southern complex is forecast to affect parts of the southern Edwards Plateau/western Hill Country within the next hour or so (4 AM to 430 AM). The other storm complex is expected to arrive between 430 AM and 5 AM to the northern Hill Country. Hi-resolution models indicate that this complex is expected to dominate while growing in area coverage as it moves over the Hill Country and the Austin area. Some of these storms could be strong and produce heavy downpours, cloud to ground lightning strikes, small hail and strong wind gusts of 40 to 60 mph. The storm complex is forecast to move southward through the morning hours through portions of the central and eastern CWA. Between the middle and late afternoon period, scattered showers and isolated storms are anticipated to affect the southern Edwards Plateau and western Hill Country as another mid to upper level shortwave pushes down to our area from Central Texas. Today's highs could be tricky because of the rain chances and cloud coverage mainly east of Highway 281 including the Austin and San Antonio metro areas. Overall, going for below climate values with highs in the lower to mid 90s across the eastern two-thirds of the area. Along the Rio Grande expect highs in the mid to upper 90s. Once the second round of showers and storms departs the western area late this afternoon/early evening, a dry forecast is in place through Sunday. Highs for Sunday are expected to reach the climate normal values which range from the lower 90s across the Hill Country and in the mid to upper 90s elsewhere under mostly sunny skies. && .LONG TERM (Sunday Night through Friday)... The long term forecast will be heavily influenced on the tropical systems. To say this forecast is low confidence is an understatement, and the scenario playing out is one of the more challenging tropical forecasts we have seen in a while. The spread in the GFS and ECMWF ensemble members on the track forecasts for both Marco and Laura remain quite large. In general Tropical Storm Marco will be steered northwest over the next day or two toward a weakness in the subtropical ridge over the central Gulf of Mexico. The subtropical ridge is then forecast to build west into the northeast Gulf of Mexico and Southeast U.S., which could result in a bend in Marco's track more westward towards the Texas coast Monday and Tuesday. Interactions with wind shear in the central and northwest Gulf is anticipated and the NHC forecast calls for some weakening of Marco Monday and Tuesday. At this time, per NHC, Marco and Laura should remain just far enough separated that binary interaction/Fujiwhara effect should be minimal. We have tried to account for the track uncertainty in our PoP forecast for Tuesday through Thursday. A weaker and farther west Marco could bring greater chances for rain across South-Central Texas, while a track farther northeast would limit rain chances. With that said the NHC track and intensity forecast takes Marco into the upper Texas Coast as a tropical storm late Tuesday and decaying into a remnant low across the eastern CWA Wednesday. It should be noted the cone of uncertainty for the center of Marco does encompass the entire EWX CWA. What could eventually be Hurricane Laura looks to be steered into the north and northwest Gulf of Mexico by Wednesday. Again a large spread in both the 00Z ECMWF and GFS ensemble members that will have to be watched closely. It's important to focus on the following Key Messages for South- Central Texas: 1) There is a high degree of uncertainty with the track and intensity forecasts for Tropical Storm Marco and Laura. 2) Do not focus on the exact forecast track as average forecast errors are quiet large this far out. The cone of uncertainty for Marco encompasses all of South-Central Texas and impacts can occur well outside this cone. 3) Due to the low confidence in the forecast, it is too soon to determine exact rainfall amounts. 4) Stay closely tuned through the weekend and follow trusted sources such as hurricanes.gov && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 90 75 96 73 98 / 30 - - 0 10 Austin Bergstrom Intl Airport 88 73 95 72 97 / 30 - - 0 10 New Braunfels Muni Airport 91 72 96 71 97 / 20 - - 0 10 Burnet Muni Airport 90 71 94 71 96 / 20 10 0 0 - Del Rio Intl Airport 98 75 99 74 99 / 10 10 - 0 0 Georgetown Muni Airport 91 72 96 73 98 / 30 - - 0 10 Hondo Muni Airport 94 72 98 71 99 / 20 10 - 0 - San Marcos Muni Airport 88 72 96 71 97 / 20 - - 0 10 La Grange - Fayette Regional 90 72 97 73 98 / 30 - - 0 10 San Antonio Intl Airport 91 74 97 73 98 / 20 10 - 0 10 Stinson Muni Airport 92 73 96 73 98 / 20 - - 0 10 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Short-Term/Aviation...17 Long-Term...Runyen
Hazardous Weather Outlook National Weather Service Austin/San Antonio TX 408 AM CDT Sat Aug 22 2020 TXZ171>173-183>194-202>209-217>225-228-230915- 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- 408 AM CDT Sat Aug 22 2020 This Hazardous Weather Outlook is for South-Central Texas.. .DAY ONE...Today And Tonight. A cluster of storms is forecast to push across the Hill Country including the Austin metro this morning. Stronger storms could produce gusty winds of 50 to 60 mph, cloud to ground lightning, heavy downpours and small hail. The storm complex is forecast to exit the area by late this morning. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Tropical Storm Marco is expected to affect the Yucatan Peninsula today and expected to enter into the Gulf of Mexico waters on Sunday. It is too soon to determine what, if any, impacts will occur across South-Central Texas from this tropical system. Tropical Storm Marco is forecast to make landfall in Texas late Tuesday. Please follow trusted sources such as hurricanes.gov. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
Special Weather Statement
National Weather Service Austin/San Antonio TX
428 AM CDT Sat Aug 22 2020
TXZ171-172-221015-
Llano TX-Burnet TX-
428 AM CDT Sat Aug 22 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LLANO AND BURNET
COUNTIES UNTIL 515 AM CDT...
At 427 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Lampasas, moving south at 30 mph.
Penny size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Burnet, Bertram, Buchanan Dam, Buchanan Lake Village, Inks Lake State
Park, Watson, Briggs, Lake Victor, Mahomet, Sunnylane, Joppa, Tow and
Shady Grove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3091 9783 3079 9796 3073 9799 3071 9846
3092 9848 3092 9842 3093 9841 3096 9845
3098 9844 3101 9846 3103 9844 3103 9791
TIME...MOT...LOC 0927Z 354DEG 24KT 3115 9832
RUNYENThe Ft Hood radar (KGRK), 82 km away, was scanning. The volume nearest the first event began at 10:12 UTC.
2 thunderstorm wind. Local standard time, as filed.
A thunderstorm produced wind gusts measured at 60 mph at the Burnet Municipal Airport-Kate Craddock Field.
A thunderstorm produced wind gusts estimated at 80 mph that damaged the Lake Travis Marina and 14 boats. Some docks were blown into each other and metal roofing at the marina was damaged.
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, August 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: 913859, 913857.