Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 122, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 11, 2021, 7:31 PM CDT for Blanco County, Kendall County, Texas. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 11, 2021, 7:31 PM CDT (00:31 UTC)
- Expired
- May 11, 2021, 7:56 PM CDT
- In force
- 25 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Blanco County, TX, Kendall County, TX
The radar
The Austin/San Antonio radar (KEWX), 55 km from the middle of the area, began a volume at 00:35 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 11, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 0.5 hours before the alert went out and 244 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
- 1860 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 142 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 5.4
The text
As transmitted.
096
WUUS54 KEWX 120031
SVREWX
TXC031-259-120115-
/O.NEW.KEWX.SV.W.0122.210512T0031Z-210512T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
731 PM CDT Tue May 11 2021
The National Weather Service in Austin San Antonio has issued a
* Severe Thunderstorm Warning for...
Southwestern Blanco County in south central Texas...
Northeastern Kendall County in south central Texas...
* Until 815 PM CDT.
* At 730 PM CDT, a severe thunderstorm was located near Kendalia, or
11 miles southwest of Blanco, moving east at 25 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Blanco, Twin Sisters and Kendalia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3018 9833 3004 9830 2996 9839 2992 9862
3003 9866
TIME...MOT...LOC 0030Z 251DEG 22KT 3000 9858
HAIL...1.00IN
WIND...<50MPH
$$3 follow-up statements
582
WWUS54 KEWX 120043
SVSEWX
Severe Weather Statement
National Weather Service Austin/San Antonio TX
743 PM CDT Tue May 11 2021
TXC031-259-120115-
/O.CON.KEWX.SV.W.0122.000000T0000Z-210512T0115Z/
Blanco TX-Kendall TX-
743 PM CDT Tue May 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHWESTERN BLANCO AND NORTHEASTERN KENDALL COUNTIES...
At 742 PM CDT, a severe thunderstorm was located near Flugrath, or
near Blanco, moving northeast at 25 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Blanco, Twin Sisters and Kendalia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3018 9833 3004 9830 2996 9839 2995 9851
3004 9861
TIME...MOT...LOC 0042Z 240DEG 22KT 3005 9851
HAIL...1.00IN
WIND...<50MPH
$$
PLATT689
WWUS54 KEWX 120053
SVSEWX
Severe Weather Statement
National Weather Service Austin/San Antonio TX
753 PM CDT Tue May 11 2021
TXC259-120103-
/O.CAN.KEWX.SV.W.0122.000000T0000Z-210512T0115Z/
Kendall TX-
753 PM CDT Tue May 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KENDALL COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.
LAT...LON 3018 9833 3004 9830 2996 9839 2996 9843
3008 9853
TIME...MOT...LOC 0053Z 244DEG 18KT 3008 9847
$$
TXC031-120115-
/O.CON.KEWX.SV.W.0122.000000T0000Z-210512T0115Z/
Blanco TX-
753 PM CDT Tue May 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHWESTERN BLANCO COUNTY...
At 753 PM CDT, a severe thunderstorm was located near Blanco, moving
northeast at 20 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Blanco and Twin Sisters.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3018 9833 3004 9830 2996 9839 2996 9843
3008 9853
TIME...MOT...LOC 0053Z 244DEG 18KT 3008 9847
HAIL...1.00IN
WIND...<50MPH
$$
PLATT408
WWUS54 KEWX 120056
SVSEWX
Severe Weather Statement
National Weather Service Austin/San Antonio TX
756 PM CDT Tue May 11 2021
TXC031-120106-
/O.CAN.KEWX.SV.W.0122.000000T0000Z-210512T0115Z/
Blanco TX-
756 PM CDT Tue May 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BLANCO COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However small hail and
heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.
LAT...LON 3018 9833 3004 9830 2996 9839 2996 9843
3008 9853
TIME...MOT...LOC 0055Z 251DEG 22KT 3009 9845
$$
PLATTThe office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:07 PM CDT | Special Weather Statement | EWX | Comal, Kendall | 38 min |
| May 11, 7:10 PM CDT | Areal Flood Advisory | EWX | Dimmit, Frio, Zavala | 3 hr |
| May 11, 7:15 PM CDT | Areal Flood Advisory | EWX | Bandera, Bexar, Comal, Kendall, Medina | 3 hr |
| May 11, 7:24 PM CDT | Special Weather Statement | EWX | Blanco | 51 min |
| May 11, 7:34 PM CDT | Special Weather Statement | EWX | Lavaca | 41 min |
| May 11, 8:10 PM CDT | Special Weather Statement | EWX | Blanco | 50 min |
| May 11, 8:37 PM CDT | Areal Flood Advisory | EWX | Atascosa | 3 hr |
| May 11, 8:43 PM CDT | Special Weather Statement | EWX | Travis | 47 min |
| May 11, 8:48 PM CDT | Severe Thunderstorm Warning | EWX | Travis | 26 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm 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.