Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Austin/San Antonio, TX

April 23, 2021Caldwell County, Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2021, 1:17 PM CDT for Caldwell County, Guadalupe County, Texas. It was in force for 23 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: Apr 23, 2021, 1:17 PM CDT (18:17 UTC)
Expired: Apr 23, 2021, 1:40 PM CDT
In force: 23 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Caldwell County, TX, Guadalupe County, TX

The radar

The Austin/San Antonio radar (KEWX), 18 km from the middle of the area, began a volume at 18:18 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
Apr 23, 12:37 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 6.3 hours before the alert went out and 234 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1041 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 520 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

As transmitted.

300 
WUUS54 KEWX 231817
SVREWX
TXC055-187-231915-
/O.NEW.KEWX.SV.W.0050.210423T1817Z-210423T1915Z/

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

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southwestern Caldwell County in south central Texas...
  Northeastern Guadalupe County in south central Texas...

* Until 215 PM CDT.

* At 117 PM CDT, a severe thunderstorm was located near Kingsbury, or
  near Seguin, moving north at 20 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  San Marcos, Seguin, Lockhart, Martindale, Kingsbury, Staples,
  Fentress, Zorn, Geronimo, San Marcos Regional Airport, Maxwell,
  Reedville and Redwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2957 9787 2961 9795 2979 9796 2986 9789
      2986 9790 2988 9789 2991 9786 2994 9780
      2987 9763
TIME...MOT...LOC 1817Z 199DEG 18KT 2963 9789 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

HAMPSHIRE

2 follow-up statements

533 
WWUS54 KEWX 231828
SVSEWX

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

TXC055-187-231915-
/O.CON.KEWX.SV.W.0050.000000T0000Z-210423T1915Z/
Caldwell TX-Guadalupe TX-
128 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR SOUTHWESTERN CALDWELL AND NORTHEASTERN GUADALUPE COUNTIES...

At 128 PM CDT, a severe thunderstorm was located over Kingsbury, or 8
miles northeast of Seguin, moving northeast at 20 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
San Marcos, Seguin, Lockhart, Martindale, Kingsbury, Staples, Zorn,
Fentress, San Marcos Regional Airport, Maxwell, Reedville and
Redwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2969 9778 2961 9784 2966 9792 2974 9796
      2976 9796 2980 9795 2986 9789 2986 9790
      2988 9789 2992 9785 2994 9780 2987 9763
TIME...MOT...LOC 1828Z 209DEG 18KT 2967 9786 

HAIL...0.75IN
WIND...60MPH
 
$$

HAMPSHIRE

009 
WWUS54 KEWX 231840
SVSEWX

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

TXC055-187-231850-
/O.CAN.KEWX.SV.W.0050.000000T0000Z-210423T1915Z/
Caldwell TX-Guadalupe TX-
140 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CALDWELL AND
NORTHEASTERN GUADALUPE 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 gusty winds are
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
south central Texas.

LAT...LON 2969 9778 2961 9784 2966 9792 2974 9796
      2976 9796 2980 9795 2986 9789 2986 9790
      2988 9789 2992 9785 2994 9780 2987 9763
TIME...MOT...LOC 1836Z 199DEG 18KT 2973 9784 

$$

HAMPSHIRE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 12:19 PM CDT	Special Weather Statement	EWX	Comal	41 min
Apr 23, 12:59 PM CDT	Special Weather Statement	EWX	Hays	31 min
Apr 23, 1:31 PM CDT	Areal Flood Advisory	EWX	Caldwell, Guadalupe	3 hr
Apr 23, 1:43 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Travis	25 min
Apr 23, 2:03 PM CDT	Areal Flood Advisory	EWX	Bastrop, Travis	3 hr
Apr 23, 3:29 PM CDT	Areal Flood Advisory	EWX	Bastrop, Lee	3 hr
Apr 23, 4:15 PM CDT	Special Weather Statement	EWX	Maverick	30 min
Apr 23, 4:39 PM CDT	Severe Thunderstorm Warning	EWX	Maverick, Zavala	51 min
Apr 23, 5:25 PM CDT	Special Weather Statement	EWX	Zavala	50 min
Apr 23, 6:05 PM CDT	Special Weather Statement	EWX	Frio	55 min
Apr 23, 6:29 PM CDT	Special Weather Statement	EWX	Bexar	61 min
Apr 23, 6:45 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe	45 min
Apr 23, 6:52 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	53 min
Apr 23, 6:59 PM CDT	Special Weather Statement	EWX	Atascosa	61 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Every 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.