Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Austin/San Antonio, TX

April 23, 2021Atascosa County, Karnes County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2021, 7:39 PM CDT for Atascosa County, Karnes County, Texas. It was in force for 51 min. 2 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 23, 2021, 7:39 PM CDT (00:39 UTC)
Expired
Apr 23, 2021, 8:30 PM CDT
In force
51 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

Counties Atascosa County, TX, Karnes County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 00:40 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

TimeReportWhereRemark
Apr 23, 7:49 PM CDTHAIL 1.751 Ene Campbellton, TXREPORT OF GOLFBALL SIZE HAIL IN CAMPBELLTON AT THE KUNTRY KORNER GROCERY STORE.
Apr 23, 7:55 PM CDTHAIL 1.52 Nnw Campbellton, TXWINDOW DAMAGE WAS REPORTED AS WELL WITH THIS STORM. NUMEROUS MARBLE SIZED HAILSTONES WITH SEVERAL PING PONG BALL SIZE AS WELL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 23, 7:05 PM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 0.7 hours before the alert went out and 139 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.

Skew-T log-pSkew-T log-p diagram, Corpus Christi, TX at 00:00Z on 2021-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1602 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 00:00Z on 2021-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1602 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
883 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

171 
WUUS54 KEWX 240039
SVREWX
TXC013-255-240130-
/O.NEW.KEWX.SV.W.0056.210424T0039Z-210424T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
739 PM CDT Fri Apr 23 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southwestern Karnes County in south central Texas...
  Southeastern Atascosa County in south central Texas...

* Until 830 PM CDT.

* At 738 PM CDT, a severe thunderstorm was located near Campbellton,
  moving east at 35 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Campbellton, Coy City, El Oso, Peggy, Fashing and Zunkerville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2864 9834 2864 9847 2882 9845 2890 9799
      2872 9792 2869 9801 2879 9810 2863 9832
      2863 9834
TIME...MOT...LOC 0038Z 271DEG 32KT 2872 9835 

HAIL...1.75IN
WIND...60MPH
 
$$

EW
2 follow-up statements
003 
WWUS54 KEWX 240101
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
801 PM CDT Fri Apr 23 2021

TXC013-255-240130-
/O.CON.KEWX.SV.W.0056.000000T0000Z-210424T0130Z/
Karnes TX-Atascosa TX-
801 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR SOUTHWESTERN KARNES AND SOUTHEASTERN ATASCOSA COUNTIES...

At 801 PM CDT, a severe thunderstorm was located over Nell, or 11
miles east of Campbellton, moving east at 35 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Campbellton, Coy City, El Oso, Peggy, Fashing and Zunkerville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2869 9829 2885 9830 2890 9799 2872 9792
      2869 9801 2879 9810 2866 9828
TIME...MOT...LOC 0101Z 271DEG 32KT 2872 9812 

HAIL...1.75IN
WIND...60MPH
 
$$

EW
281 
WWUS54 KEWX 240111
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
811 PM CDT Fri Apr 23 2021

TXC013-240121-
/O.CAN.KEWX.SV.W.0056.000000T0000Z-210424T0130Z/
Atascosa TX-
811 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ATASCOSA 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 1100 PM CDT for
south central Texas.

LAT...LON 2872 9792 2869 9801 2879 9810 2883 9796
TIME...MOT...LOC 0111Z 271DEG 32KT 2872 9802 

$$

TXC255-240130-
/O.CON.KEWX.SV.W.0056.000000T0000Z-210424T0130Z/
Karnes TX-
811 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR SOUTHWESTERN KARNES COUNTY...

At 811 PM CDT, a severe thunderstorm was located near Nell, or 12
miles southwest of Kenedy, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Zunkerville and El Oso. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2872 9792 2869 9801 2879 9810 2883 9796
TIME...MOT...LOC 0111Z 271DEG 32KT 2872 9802 

HAIL...1.00IN
WIND...60MPH
 
$$

EW

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 7:16 PM CDTSevere Thunderstorm WarningEWXBexar, Wilson29 min
Apr 23, 7:32 PM CDTSpecial Weather StatementEWXGuadalupe43 min
Apr 23, 7:42 PM CDTSevere Thunderstorm WarningEWXBexar, Wilson48 min
Apr 23, 8:14 PM CDTSevere Thunderstorm WarningEWXDeWitt, Gonzales, Karnes, Wilson46 min
Apr 23, 8:31 PM CDTSpecial Weather StatementEWXKarnes44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.