Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 53, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Sep 29, 2021, 1:23 AM CDT for Bexar County, Comal County, Guadalupe County, Texas. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 29, 2021, 1:23 AM CDT (06:23 UTC)
- Expired
- Sep 29, 2021, 5:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Bexar County, TX, Comal County, TX, Guadalupe County, TX
The radar
The Austin/San Antonio radar (KEWX), 20 km from the middle of the area, began a volume at 06:24 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 29, 2:30 AM CDT | FLASH FLOOD | 3 Sse Cibolo, TX | THE SCHERTZ EMERGENCY MANAGER INDICATED THAT A FEW ROADS WERE CLOSED DUE TO HIGH WATER INCLUDING LOWER SEGUIN ROAD AT WEIR ROAD AND 1518 AT OAK STREET. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 6.4 hours before the alert went out and 256 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1438 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 1769 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
436
WGUS54 KEWX 290623
FFWEWX
TXC029-091-187-291000-
/O.NEW.KEWX.FF.W.0053.210929T0623Z-210929T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
123 AM CDT Wed Sep 29 2021
The National Weather Service in Austin/San Antonio has issued a
* Flash Flood Warning for...
East Central Bexar County in south central Texas...
Southeastern Comal County in south central Texas...
West Central Guadalupe County in south central Texas...
* Until 500 AM CDT.
* At 123 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts up to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
San Antonio, New Braunfels, Schertz, Seguin, Cibolo, Universal
City, Live Oak, Selma, Randolph AFB, Windcrest, Garden Ridge,
McQueeney, Marion, Santa Clara, Converse and Solms.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2951 9820 2948 9829 2946 9837 2954 9837
2958 9830 2960 9830 2969 9829 2973 9825
2974 9824 2972 9819 2969 9808 2969 9807
2966 9800 2961 9798 2953 9814
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MO1 follow-up statement
367
WGUS74 KEWX 290717
FFSEWX
Flash Flood Statement
National Weather Service Austin/San Antonio TX
217 AM CDT Wed Sep 29 2021
TXC029-091-187-291000-
/O.CON.KEWX.FF.W.0053.000000T0000Z-210929T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-Comal TX-Guadalupe TX-
217 AM CDT Wed Sep 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CDT EARLY THIS
MORNING FOR EAST CENTRAL BEXAR, SOUTHEASTERN COMAL AND WEST CENTRAL
GUADALUPE COUNTIES...
At 217 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 4 inches of rain have
fallen. Additional rainfall amounts up to 1 inch are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
San Antonio, New Braunfels, Schertz, Seguin, Cibolo, Universal
City, Live Oak, Selma, Randolph AFB, Windcrest, Garden Ridge,
McQueeney, Marion, Santa Clara, Converse and Solms.
Radar estimates suggest that between 3 and 4 and 1/2 inches of rain
fell since 1130 pm over Highway 78 from Cibolo to McQueeny
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2951 9820 2948 9829 2946 9837 2954 9837
2958 9830 2960 9830 2969 9829 2973 9825
2974 9824 2972 9819 2969 9808 2969 9807
2966 9800 2961 9798 2953 9814
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MOThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 7:01 PM CDT | Special Weather Statement | EWX | Gonzales | 44 min |
| Sep 28, 7:34 PM CDT | Special Weather Statement | EWX | Mason | 26 min |
| Sep 28, 7:45 PM CDT | Severe Thunderstorm Warning | EWX | Williamson | 37 min |
| Sep 28, 7:57 PM CDT | Special Weather Statement | EWX | Travis | 48 min |
| Sep 28, 8:43 PM CDT | Areal Flood Advisory | EWX | Travis, Williamson | 3 hr |
| Sep 28, 8:44 PM CDT | Areal Flood Advisory | EWX | Gillespie | 4 hr |
| Sep 28, 9:04 PM CDT | Areal Flood Advisory | EWX | Zavala | 3 hr |
| Sep 28, 9:10 PM CDT | Areal Flood Advisory | EWX | Williamson | 3 hr |
| Sep 28, 9:12 PM CDT | Special Weather Statement | EWX | Bexar | 48 min |
| Sep 28, 9:29 PM CDT | Special Weather Statement | EWX | Bandera | 46 min |
| Sep 28, 9:40 PM CDT | Special Weather Statement | EWX | Hays | 50 min |
| Sep 28, 9:47 PM CDT | Areal Flood Advisory | EWX | Lee, Travis, Williamson | 3 hr |
| Sep 28, 9:52 PM CDT | Areal Flood Advisory | EWX | Bexar | 3 hr |
| Sep 28, 9:58 PM CDT | Areal Flood Advisory | EWX | Comal, Hays, Kendall, Travis | 3 hr |
| Sep 28, 10:10 PM CDT | Special Weather Statement | EWX | Kendall | 50 min |
| Sep 28, 10:13 PM CDT | Areal Flood Advisory | EWX | Bandera | 3 hr |
| Sep 28, 10:20 PM CDT | Special Weather Statement | EWX | Kendall | 40 min |
| Sep 28, 10:40 PM CDT | Special Weather Statement | EWX | Kerr | 50 min |
| Sep 28, 11:09 PM CDT | Special Weather Statement | EWX | Comal | 51 min |
| Sep 28, 11:19 PM CDT | Special Weather Statement | EWX | Comal, Guadalupe | 41 min |
| Sep 28, 11:23 PM CDT | Flash Flood Warning | EWX | Comal, Hays | 3 hr |
| Sep 28, 11:36 PM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Comal, Guadalupe, Hays, Travis | 3 hr |
| Sep 28, 11:49 PM CDT | Flash Flood Warning | EWX | Caldwell, Comal, Guadalupe, Hays | 5 hr |
| Sep 29, 12:27 AM CDT | Special Weather Statement | EWX | Gonzales | 48 min |
| Sep 29, 12:37 AM CDT | Areal Flood Advisory | EWX | Bastrop, Caldwell, Fayette, Gonzales, Guadalupe, Lee | 3 hr |
| Sep 29, 12:43 AM CDT | Areal Flood Advisory | EWX | Bexar, Comal, Gonzales, Guadalupe | 3 hr |
| Sep 29, 1:34 AM CDT | Areal Flood Advisory | EWX | Gillespie | 3 hr |
| Sep 29, 2:05 AM CDT | Areal Flood Advisory | EWX | DeWitt, Fayette, Gonzales, Karnes, Lavaca, Wilson | 4 hr |
| Sep 29, 2:28 AM CDT | Special Weather Statement | EWX | Blanco | 47 min |
| Sep 29, 3:00 AM CDT | Special Weather Statement | EWX | Kerr | 45 min |
| Sep 29, 3:21 AM CDT | Severe Thunderstorm Warning | EWX | Gillespie, Kerr, Real | 42 min |
| Sep 29, 3:44 AM CDT | Special Weather Statement | EWX | Bandera | 46 min |
| Sep 29, 4:15 AM CDT | Areal Flood Advisory | EWX | Bandera, Kendall, Kerr | 4 hr |
| Sep 29, 6:25 AM CDT | Areal Flood Advisory | EWX | Bandera, Bexar, Medina | 3 hr |
Nearby
Flash Flood Warnings in Texas, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.