Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 177, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Aug 1, 2021, 5:47 PM CDT for Bexar County, Comal County, Texas. It was in force for 33 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
- Aug 1, 2021, 5:47 PM CDT (22:47 UTC)
- Expired
- Aug 1, 2021, 6:20 PM CDT
- In force
- 33 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Bexar County, TX, Comal County, TX
The radar
The Austin/San Antonio radar (KEWX), 35 km from the middle of the area, began a volume at 22:51 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, 10.8 hours before the alert went out and 247 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.
654
WUUS54 KEWX 012247
SVREWX
TXC029-091-012345-
/O.NEW.KEWX.SV.W.0177.210801T2247Z-210801T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
547 PM CDT Sun Aug 1 2021
The National Weather Service in Austin San Antonio has issued a
* Severe Thunderstorm Warning for...
North central Bexar County in south central Texas...
Central Comal County in south central Texas...
* Until 645 PM CDT.
* At 547 PM CDT, a severe thunderstorm was located over Spring
Branch, or 10 miles west of Canyon Lake Dam, moving south at 5 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* Locations impacted include...
Canyon Lake Dam, Canyon Lake, Bulverde, Spring Branch, Smithson
Valley, Fischer, Guadalupe River State Park, Timberwood Park,
Anhalt, Honey Creek State Natural Area, Startzville and Specht
Store.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.
If on or near Canyon Lake, get away from the water and move indoors
or inside a vehicle. Remember, lightning can strike out to 15 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 2998 9825 2975 9814 2968 9844 2977 9858
2994 9841
TIME...MOT...LOC 2247Z 359DEG 5KT 2990 9837
HAIL...1.50IN
WIND...<50MPH
$$
CP1 follow-up statement
717
WWUS54 KEWX 012320
SVSEWX
Severe Weather Statement
National Weather Service Austin/San Antonio TX
620 PM CDT Sun Aug 1 2021
TXC029-091-012330-
/O.CAN.KEWX.SV.W.0177.000000T0000Z-210801T2345Z/
Bexar TX-Comal TX-
620 PM CDT Sun Aug 1 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BEXAR AND
CENTRAL COMAL COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However heavy rain is
still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Austin San Antonio.
LAT...LON 2998 9825 2975 9814 2968 9844 2977 9858
2994 9841
TIME...MOT...LOC 2320Z 359DEG 5KT 2970 9879
$$
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, 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 |
| Aug 1, 6:56 PM CDT | Flash Flood Warning | EWX | Bexar, Kendall | 3 hr |
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.