Thunderstorms developed along an old outflow boundary in a very moist atmosphere. Steering flow was weak resulting in slow storm motion which led to heavy rainfall and flash flooding.
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The episode as NWS EWX wrote it up.
Thunderstorms developed along an old outflow boundary in a very moist atmosphere. Steering flow was weak resulting in slow storm motion which led to heavy rainfall and 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 14, 5:25 AM CST, 2 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Austin/San Antonio TX 625 AM CDT WED SEP 14 2016 .AVIATION... A small cluster of SHRA/TSRA drifting west and have mentioned VCSH at KDRT thru 16Z. Otherwise, ISOLD to SCT SHRA/TSRA are expected today into tonight. However, have left mention out of TAFS as probs less than 30. Will monitor radar trends for possible later updates to mention. Areas of stratus with IFR/MVFR CIGs will lift and become SCT VFR by midday and then redevelop overnight. Have left the TAF sites SCT this morning as flow more ELY in the lower levels. ELY winds up to 10 KTS will prevail. && .PREV DISCUSSION... /ISSUED 336 AM CDT WED SEP 14 2016/ SHORT TERM (Today through Thursday)... Scattered showers and isolated thunderstorms are expected along the Rio Grande through the mid-morning hours. Some of these showers and storms could generate heavy rain at times and may result in minor flooding/ponding of water over roadways and underpasses. The rest of the area remains relatively quiet for much of the morning period. Scattered showers and isolated thunderstorms are possible across the coastal Plains and Hill Country this afternoon where best moisture and lift reside. Rainfall amounts will generally range from few hundredths to one quarter inch. High temperatures will be around the upper 80s across the Hill Country to lower 90s over the rest of South- Central Texas. The evening looks relatively quiet with a drier airmass pushing from east Texas into our area. However, can't rule out the possibility of one or two rain-showers mainly south of Highway 90 and along the Rio Grande Plains due to moderate instability. On Thursday, scattered showers and isolated thunderstorms are expected across the coastal Plains and far southeast counties of South-Central Texas as increased moisture arrives from the east. High temperatures will be right at climate normal values for mid- September. LONG TERM (Thursday Night through Tuesday)... The subtropical ridge is forecast to weaken Thursday into Friday as a long-wave upper level trough drops from the Pacific northwest into the four corners region. In addition, an upper level disturbance over the central Gulf of Mexico waters is forecast to push into the southwest Gulf and will allow for a southwest flow aloft to dominate the region. The slow progression of the long-wave upper level trough will help convection to fire-up mainly across the coastal Plains and areas along and east of Interstate 35 on Friday. For the upcoming weekend, medium-range models differ on a weak frontal boundary expected to push across central Texas. Preferred GFS solution for the extended forecast period and reduced PoPs for the later part of the forecast versus previous weather package. Overall, there are chances for rain over the weekend into early next week as several outflow boundaries push down into our area and trigger showers and storms to develop mainly across the northern part of the Hill Country and eastern counties. Rainfall amounts could range from one quarter to one half inch with up to one inch over few spots this weekend. && .PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 92 73 93 73 91 / 20 20 20 20 30 Austin Bergstrom Intl Airport 91 72 92 72 91 / 20 20 20 20 30 New Braunfels Muni Airport 91 72 92 73 91 / 20 20 20 20 30 Burnet Muni Airport 89 71 90 72 89 / 30 20 20 20 30 Del Rio Intl Airport 91 74 92 75 93 / 20 20 20 20 10 Georgetown Muni Airport 90 72 91 72 90 / 20 20 20 20 30 Hondo Muni Airport 92 73 93 73 92 / 20 20 20 10 20 San Marcos Muni Airport 90 72 92 73 91 / 20 20 20 20 30 La Grange - Fayette Regional 92 74 92 75 91 / 30 20 30 20 40 San Antonio Intl Airport 92 74 92 74 91 / 20 20 20 20 20 Stinson Muni Airport 92 75 93 75 92 / 20 20 20 20 20 && .EWX WATCHES/WARNINGS/ADVISORIES... None. && Mesoscale/Aviation...04 Synoptic/Grids...17
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 339 AM CDT WED SEP 14 2016 TXZ171>173-183>194-202>209-217>225-228-151000- 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- 339 AM CDT WED SEP 14 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
831 AM CDT WED SEP 14 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0831 AM FLASH FLOOD 10 NW UVALDE 29.32N 99.90W
09/14/2016 UVALDE TX DEPT OF HIGHWAYS
PARTS OF HWY 55 CLOSED DUE TO FLOODING
&&
EVENT NUMBER EWX1600647
CVPThe Laughlin AFB radar (KDFX), 37 km away, was scanning. The volume nearest the first event began at 13:28 UTC.
2 flash flood. Local standard time, as filed.
Thunderstorms produced heavy rain that caused flash flooding closing parts of Hwy 55 northwest of Uvalde.
Thunderstorms produced heavy rain that caused flash flooding closing Hwy 127 southeast of Concan.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2016Every state in 2016This day in weather historyWarnings in Texas, September 2016
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: 655766, 655767.