Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 40, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jul 9, 2021, 4:25 PM CDT for Atascosa County, Bexar County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2021, 4:25 PM CDT (21:25 UTC)
- Expired
- Jul 9, 2021, 7:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Atascosa County, TX, Bexar County, TX
The radar
The Austin/San Antonio radar (KEWX), 82 km from the middle of the area, began a volume at 21:29 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.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 9.4 hours before the alert went out and 198 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
- 994 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
517
WGUS54 KEWX 092125
FFWEWX
TXC013-029-100030-
/O.NEW.KEWX.FF.W.0040.210709T2125Z-210710T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
425 PM CDT Fri Jul 9 2021
The National Weather Service in Austin/San Antonio has issued a
* Flash Flood Warning for...
Northwestern Atascosa County in south central Texas...
Southwestern Bexar County in south central Texas...
* Until 730 PM CDT.
* At 425 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 4 inches of rain
have fallen. Additional rainfall amounts up to 3 inches are
possible in the warned area as more bands of showers move into the
warned area from the south. 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, Poteet, Somerset, Leming, Sandy Oaks, Von Ormy, Buena
Vista, Thelma, Espey, Losoya, Mitchell Lake, Amphion and Braunig
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 2923 9866 2931 9866 2934 9864 2935 9860
2929 9852 2928 9842 2924 9836 2920 9837
2914 9847 2908 9850 2903 9855 2897 9855
2895 9856 2894 9858 2894 9863 2896 9868
2900 9868 2911 9866 2916 9866 2920 9867
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP1 follow-up statement
717
WGUS74 KEWX 092308
FFSEWX
Flash Flood Statement
National Weather Service Austin/San Antonio TX
608 PM CDT Fri Jul 9 2021
TXC013-029-100030-
/O.CON.KEWX.FF.W.0040.000000T0000Z-210710T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atascosa TX-Bexar TX-
608 PM CDT Fri Jul 9 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT THIS
EVENING FOR NORTHWESTERN ATASCOSA AND SOUTHWESTERN BEXAR COUNTIES...
At 608 PM CDT, Doppler radar indicated light to moderate rain across
the warned area. Between 1 and 5 inches of rain have fallen.
Additional rainfall amounts up to 1/2 inch are possible in the
warned area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Rain producing flash
flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
San Antonio, Poteet, Somerset, Leming, Sandy Oaks, Von Ormy, Buena
Vista, Thelma, Espey, Losoya, Mitchell Lake, Amphion and Braunig
Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 2923 9866 2931 9866 2934 9864 2935 9860
2929 9852 2928 9842 2924 9836 2920 9837
2914 9847 2908 9850 2903 9855 2897 9855
2895 9856 2894 9858 2894 9863 2896 9868
2900 9868 2911 9866 2916 9866 2920 9867
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CPThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 9:47 PM CDT | Areal Flood Advisory | EWX | DeWitt, Karnes | 6 hr |
| Jul 8, 10:46 PM CDT | Areal Flood Advisory | EWX | Karnes | 5 hr |
| Jul 8, 11:01 PM CDT | Flash Flood Warning | EWX | Karnes | 5 hr |
| Jul 9, 3:10 AM CDT | Flash Flood Warning | EWX | DeWitt, Karnes, Wilson | 3 hr |
| Jul 9, 4:14 AM CDT | Areal Flood Advisory | EWX | Karnes | 4 hr |
| Jul 9, 11:17 AM CDT | Areal Flood Advisory | EWX | DeWitt, Gonzales | 5 hr |
| Jul 9, 11:19 AM CDT | Areal Flood Advisory | EWX | DeWitt, Lavaca | 5 hr |
| Jul 9, 2:10 PM CDT | Areal Flood Advisory | EWX | Bexar, Comal, Guadalupe, Wilson | 4 hr |
| Jul 9, 2:29 PM CDT | Areal Flood Advisory | EWX | Dimmit, Frio, Zavala | 3 hr |
| Jul 9, 3:26 PM CDT | Areal Flood Advisory | EWX | Atascosa, Bexar | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.