Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Apr 30, 2021, 5:48 PM CDT for Bexar County, Texas. It was in force for 6 hr. 4 reports 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
- Apr 30, 2021, 5:48 PM CDT (22:48 UTC)
- Expired
- Apr 30, 2021, 11:45 PM CDT
- In force
- 6 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Bexar County, TX
The radar
The Austin/San Antonio radar (KEWX), 47 km from the middle of the area, began a volume at 22:46 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 |
|---|---|---|---|
| Apr 30, 8:05 PM CDT | FLASH FLOOD | 2 Se Castle Hills, TX | MPING REPORT OF ROAD CLOSED DUE TO FLOODING AND/OR VEHICLES STRANDED. |
| Apr 30, 9:11 PM CDT | FLASH FLOOD | 1 Sw San Antonio, TX | MPING REPORT OF ROAD CLOSED DUE TO FLOODING AND/OR VEHICLES STRANDED. |
| Apr 30, 9:28 PM CDT | FLASH FLOOD | 1 Ssw Olmos Park, TX | FLOOD WATERS FORCING EVACUATIONS AT APARTMENT COMPLEX NEAR HOWARD ST AND SAN PEDRO AVE. |
| Apr 30, 9:33 PM CDT | FLASH FLOOD | San Antonio, TX | EMERGENCY MANAGEMENT REPORTS SEVERAL WATER EVACUATIONS AND CLOSED ROADWAYS AROUND THE CITY. |
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 12:00Z, 10.8 hours before the alert went out and 228 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
672
WGUS54 KEWX 302248
FFWEWX
TXC029-010145-
/O.NEW.KEWX.FF.W.0002.210430T2248Z-210501T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
548 PM CDT Fri Apr 30 2021
The National Weather Service in Austin/San Antonio has issued a
* Flash Flood Warning for...
Bexar County in south central Texas...
* Until 845 PM CDT.
* At 548 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 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, Schertz, Universal City, Live Oak, Selma, San Antonio
Int Airport, Stinson Municipal Airport, Randolph AFB, Leon Valley,
Helotes, Fair Oaks Ranch, Kirby, Alamo Heights, Windcrest, Terrell
Hills, Bulverde, Shavano Park, Hollywood Park, Cross Mountain and
Olmos Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2975 9865 2974 9864 2974 9861 2976 9855
2974 9853 2974 9845 2972 9844 2973 9842
2975 9842 2969 9838 2966 9838 2966 9835
2962 9835 2960 9831 2956 9830 2953 9825
2919 9861 2926 9880 2969 9881 2971 9879
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BRADY3 follow-up statements
881
WGUS74 KEWX 010018
FFSEWX
Flash Flood Statement
National Weather Service Austin/San Antonio TX
718 PM CDT Fri Apr 30 2021
TXC029-010145-
/O.CON.KEWX.FF.W.0002.000000T0000Z-210501T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bexar TX-
718 PM CDT Fri Apr 30 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT THIS
EVENING FOR BEXAR COUNTY...
At 718 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
San Antonio, Schertz, Universal City, Live Oak, Selma, San Antonio
Int Airport, Stinson Municipal Airport, Randolph AFB, Leon Valley,
Helotes, Fair Oaks Ranch, Kirby, Alamo Heights, Windcrest, Terrell
Hills, Bulverde, Shavano Park, Hollywood Park, Cross Mountain and
Olmos Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2975 9865 2974 9864 2974 9861 2976 9855
2974 9853 2974 9845 2972 9844 2973 9842
2975 9842 2969 9838 2966 9838 2966 9835
2962 9835 2960 9831 2956 9830 2953 9825
2919 9861 2926 9880 2969 9881 2971 9879
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BRADY705
WGUS54 KEWX 010134
FFWEWX
TXC029-010315-
/O.EXT.KEWX.FF.W.0002.000000T0000Z-210501T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
834 PM CDT Fri Apr 30 2021
The National Weather Service in Austin/San Antonio has extended the
* Flash Flood Warning for...
Bexar County in south central Texas...
* Until 1015 PM CDT.
* At 834 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 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...
San Antonio, Schertz, Universal City, Live Oak, Selma, San Antonio
Int Airport, Stinson Municipal Airport, Randolph AFB, Leon Valley,
Helotes, Fair Oaks Ranch, Kirby, Alamo Heights, Windcrest, Terrell
Hills, Bulverde, Shavano Park, Hollywood Park, Cross Mountain and
Olmos Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 2975 9865 2974 9864 2974 9861 2976 9855
2974 9853 2974 9845 2972 9844 2973 9842
2975 9842 2969 9838 2966 9838 2966 9835
2962 9835 2960 9831 2956 9830 2953 9825
2919 9861 2926 9880 2969 9881 2971 9879
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BRADY069
WGUS54 KEWX 010251
FFWEWX
TXC029-010445-
/O.EXT.KEWX.FF.W.0002.000000T0000Z-210501T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Austin/San Antonio TX
951 PM CDT Fri Apr 30 2021
The National Weather Service in Austin/San Antonio has extended the
* Flash Flood Warning for...
Bexar County in south central Texas...
* Until 1145 PM CDT.
* At 951 PM CDT, emergency management reports several high water
rescues and numerous street closures across San Antonio and Bexar
county. Between 1.5 and 3 inches of rain have fallen. Additional
rainfall amounts up to 1 inch are possible in the warned area.
Flash flooding is already occurring.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
San Antonio, Schertz, Universal City, Live Oak, Selma, San Antonio
Int Airport, Stinson Municipal Airport, Randolph AFB, Leon Valley,
Helotes, Fair Oaks Ranch, Kirby, Alamo Heights, Windcrest, Terrell
Hills, Bulverde, Shavano Park, Hollywood Park, Cross Mountain and
Olmos Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 2975 9865 2974 9864 2974 9861 2976 9855
2974 9853 2974 9845 2972 9844 2973 9842
2975 9842 2969 9838 2966 9838 2966 9835
2962 9835 2960 9831 2956 9830 2953 9825
2919 9861 2926 9880 2969 9881 2971 9879
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BRADYThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 3:34 AM CDT | Flash Flood Watch | EWX | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 15 more | 39 hr |
| Apr 30, 11:25 AM CDT | Areal Flood Advisory | EWX | Atascosa | 3 hr |
| Apr 30, 4:53 PM CDT | Areal Flood Advisory | EWX | Bexar | 112 min |
| Apr 30, 6:52 PM CDT | Areal Flood Advisory | EWX | Comal | 69 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.