Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 42, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Aug 2, 2021, 4:09 AM CDT for 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
- Aug 2, 2021, 4:09 AM CDT (09:09 UTC)
- Expired
- Aug 2, 2021, 8:30 AM CDT
- In force
- 4 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Comal County, TX, Guadalupe County, TX
The radar
The Austin/San Antonio radar (KEWX), 1 km from the middle of the area, began a volume at 09:11 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 |
|---|---|---|---|
| Aug 2, 7:00 AM CDT | HEAVY RAIN 4.73 | 1 N Geronimo, TX | 24 HOUR RAINFALL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 9.2 hours before the alert went out and 229 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
- 1117 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1455 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.6
The text
As transmitted.
132
WGUS54 KEWX 020909
FFWEWX
TXC091-187-021330-
/O.NEW.KEWX.FF.W.0042.210802T0909Z-210802T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
409 AM CDT Mon Aug 2 2021
The National Weather Service in Austin/San Antonio has issued a
* Flash Flood Warning for...
Southeastern Comal County in south central Texas...
Central Guadalupe County in south central Texas...
* Until 830 AM CDT.
* At 409 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area which covers New Braunfels,
Zorn, Geronimo, and Clear Springs. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts of 1 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...
New Braunfels, Seguin, McQueeney, Kingsbury, Geronimo, Zorn, New
Braunfels Regional Airport, Freiheit, Gruene 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.
&&
LAT...LON 2966 9819 2975 9814 2974 9803 2979 9794
2976 9786 2966 9786 2959 9797
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 |
|---|---|---|---|---|
| Aug 1, 7:53 PM CDT | Areal Flood Advisory | EWX | Bandera, Real | 3 hr |
| Aug 1, 11:02 PM CDT | Areal Flood Advisory | EWX | Kendall | 3 hr |
| Aug 2, 12:27 AM CDT | Areal Flood Advisory | EWX | Bastrop, Hays, Travis | 3 hr |
| Aug 2, 3:45 AM CDT | Areal Flood Advisory | EWX | Comal, Guadalupe, Hays | 4 hr |
| Aug 2, 3:53 AM CDT | Areal Flood Advisory | EWX | Edwards, Kinney | 4 hr |
| Aug 2, 4:13 AM CDT | Areal Flood Advisory | EWX | Uvalde | 4 hr |
| Aug 2, 5:41 AM CDT | Flash Flood Warning | EWX | Guadalupe | 4 hr |
| Aug 2, 5:45 AM CDT | Areal Flood Advisory | EWX | Bexar, Guadalupe, Wilson | 3 hr |
| Aug 2, 5:51 AM CDT | Areal Flood Advisory | EWX | Bandera, Real | 3 hr |
| Aug 2, 5:57 AM CDT | Areal Flood Advisory | EWX | Comal, Hays | 4 hr |
| Aug 2, 6:37 AM CDT | Areal Flood Advisory | EWX | Bandera, Kerr, Medina | 4 hr |
| Aug 2, 6:37 AM CDT | Flash Flood Warning | EWX | Comal | 5 hr |
| Aug 2, 6:52 AM CDT | Flash Flood Warning | EWX | Hays | 3 hr |
| Aug 2, 7:15 AM CDT | Areal Flood Advisory | EWX | Bandera, Bexar, Comal, Kendall, Kerr, Medina | 5 hr |
| Aug 2, 7:29 AM CDT | Special Weather Statement | EWX | Bexar | 46 min |
| Aug 2, 7:47 AM CDT | Flash Flood Warning | EWX | Bexar, Comal, Kendall | 4 hr |
| Aug 2, 8:13 AM CDT | Areal Flood Advisory | EWX | Kinney | 3 hr |
| Aug 2, 8:15 AM CDT | Areal Flood Advisory | EWX | Bastrop, Lee, Travis, Williamson | 5 hr |
| Aug 2, 8:18 AM CDT | Special Weather Statement | EWX | Bexar, Comal | 42 min |
| Aug 2, 8:26 AM CDT | Areal Flood Advisory | EWX | Bexar, Comal, Kendall | 4 hr |
| Aug 2, 8:36 AM CDT | Areal Flood Advisory | EWX | Bexar | 4 hr |
| Aug 2, 9:16 AM CDT | Areal Flood Advisory | EWX | Blanco, Hays, Travis | 3 hr |
| Aug 2, 10:25 AM CDT | Areal Flood Advisory | EWX | Kinney, Maverick, Uvalde, Zavala | 3 hr |
| Aug 2, 2:45 PM CDT | Areal Flood Advisory | EWX | Bandera, Edwards, Kerr, Real, Val Verde | 3 hr |
| Aug 2, 4:56 PM CDT | Areal Flood Advisory | EWX | Travis, Williamson | 3 hr |
| Aug 2, 5:12 PM CDT | Areal Flood Advisory | EWX | Blanco, Hays | 3 hr |
| Aug 2, 6:19 PM CDT | Areal Flood Advisory | EWX | Caldwell, Hays, Travis | 2 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.