Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 41, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Aug 1, 2021, 6:56 PM CDT for Bexar County, Kendall 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
- Aug 1, 2021, 6:56 PM CDT (23:56 UTC)
- Expired
- Aug 1, 2021, 10:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Bexar County, TX, Kendall County, TX
The radar
The Austin/San Antonio radar (KEWX), 61 km from the middle of the area, began a volume at 23:59 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
Del Rio, TX (KDRT), launched 12:00Z, 11.9 hours before the alert went out and 215 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
- 1723 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1127 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
699
WGUS54 KEWX 012356
FFWEWX
TXC029-259-020300-
/O.NEW.KEWX.FF.W.0041.210801T2356Z-210802T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
656 PM CDT Sun Aug 1 2021
The National Weather Service in Austin/San Antonio has issued a
* Flash Flood Warning for...
Northwestern Bexar County in south central Texas...
South Central Kendall County in south central Texas...
* Until 1000 PM CDT.
* At 656 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 3 inches of rain have
fallen. Additional rainfall amounts up to 3 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, Boerne, Fair Oaks Ranch, Cross Mountain, Leon
Springs, The Dominion, Scenic Oaks and Cascade Caverns.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 2974 9881 2978 9876 2978 9870 2980 9867
2980 9865 2978 9861 2974 9864 2974 9861
2974 9860 2975 9860 2974 9858 2975 9857
2973 9855 2970 9855 2964 9862 2963 9866
2968 9874 2972 9878
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP1 follow-up statement
668
WGUS74 KEWX 020121
FFSEWX
Flash Flood Statement
National Weather Service Austin/San Antonio TX
821 PM CDT Sun Aug 1 2021
TXC029-259-020300-
/O.CON.KEWX.FF.W.0041.000000T0000Z-210802T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-Kendall TX-
821 PM CDT Sun Aug 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM CDT THIS
EVENING FOR NORTHWESTERN BEXAR AND SOUTH CENTRAL KENDALL COUNTIES...
At 821 PM CDT, Doppler radar indicated light to moderate rain across
the warned area. Up to 3 inches of rain have fallen. Additional
rainfall amounts up to 1/2 inch are possible in the warned area.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
San Antonio, Boerne, Fair Oaks Ranch, Cross Mountain, Leon
Springs, The Dominion, Scenic Oaks and Cascade Caverns.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 2974 9881 2978 9876 2978 9870 2980 9867
2980 9865 2978 9861 2974 9864 2974 9861
2974 9860 2975 9860 2974 9858 2975 9857
2973 9855 2970 9855 2964 9862 2963 9866
2968 9874 2972 9878
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CPThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 2:29 PM CDT | Special Weather Statement | EWX | Edwards | 46 min |
| Aug 1, 3:16 PM CDT | Special Weather Statement | EWX | Kinney, Real | 44 min |
| Aug 1, 5:09 PM CDT | Areal Flood Advisory | EWX | Hays, Travis, Williamson | 3 hr |
| Aug 1, 5:11 PM CDT | Areal Flood Advisory | EWX | Val Verde | 3 hr |
| Aug 1, 5:36 PM CDT | Special Weather Statement | EWX | Comal | 39 min |
| Aug 1, 5:47 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Comal | 33 min |
| Aug 1, 6:01 PM CDT | Special Weather Statement | EWX | Bexar | 59 min |
| Aug 1, 6:14 PM CDT | Areal Flood Advisory | EWX | Bandera, Bexar, Comal, Kendall, Medina | 3 hr |
| Aug 1, 6:43 PM CDT | Special Weather Statement | EWX | Bexar | 47 min |
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.