Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Austin/San Antonio, TX

April 23, 2021Bastrop County, Travis County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 23, 2021, 1:43 PM CDT for Bastrop County, Travis 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: Apr 23, 2021, 1:43 PM CDT (18:43 UTC)
Expired: Apr 23, 2021, 2:08 PM CDT
In force: 25 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bastrop County, TX, Travis County, TX

The radar

The Ft Hood radar (KGRK), 61 km from the middle of the area, began a volume at 18:43 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, 6.7 hours before the alert went out and 272 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.

058 
WUUS54 KEWX 231843
SVREWX
TXC021-453-231945-
/O.NEW.KEWX.SV.W.0051.210423T1843Z-210423T1945Z/

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

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southeastern Travis County in south central Texas...
  Central Bastrop County in south central Texas...

* Until 245 PM CDT.

* At 143 PM CDT, a severe thunderstorm was located near Cedar Creek,
  or 12 miles northeast of Lockhart, moving northeast at 20 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...
  Elgin, Bastrop, Manor, Cedar Creek, Camp Swift, Wyldwood, Circle
  D-KC Estates, Webberville, Phelan, Garfield, Rockne, McDade, Cedar
  Hills, Bateman and Butler.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2993 9748 3005 9763 3046 9750 3040 9733
      3028 9717
TIME...MOT...LOC 1843Z 209DEG 18KT 3001 9754 

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

HAMPSHIRE

1 follow-up statement

678 
WWUS54 KEWX 231908
SVSEWX

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

TXC021-453-231918-
/O.CAN.KEWX.SV.W.0051.000000T0000Z-210423T1945Z/
Travis TX-Bastrop TX-
208 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TRAVIS AND
CENTRAL BASTROP 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 and
heavy rain are still possible with this thunderstorm.

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

LAT...LON 2993 9748 3005 9763 3046 9750 3040 9733
      3028 9717
TIME...MOT...LOC 1906Z 209DEG 18KT 3012 9747 

$$

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, 1:17 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Guadalupe	23 min
Apr 23, 1:31 PM CDT	Areal Flood Advisory	EWX	Caldwell, Guadalupe	3 hr
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.