Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 101, NWS Austin/San Antonio, TX

May 4, 20214 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 4, 2021, 6:41 AM CDT for 4 counties in Texas. It was in force for 64 min. 8 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: May 4, 2021, 6:41 AM CDT (11:41 UTC)
Expired: May 4, 2021, 7:45 AM CDT
In force: 64 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Bastrop County, TX, Caldwell County, TX, Hays County, TX, Travis County, TX

The radar

The Austin/San Antonio radar (KEWX), 38 km from the middle of the area, began a volume at 11:41 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

Time	Report	Where	Remark
May 4, 6:47 AM CDT	HAIL 1	2 Ene San Marcos, TX	MPING REPORT.
May 4, 6:52 AM CDT	HAIL 1.5	4 Ene San Marcos, TX	TWITTER REPORT FROM NEAR SAN MARCOS AIRPORT.
May 4, 7:25 AM CDT	HAIL 1.75	4 Se Uhland, TX
May 4, 7:26 AM CDT	HAIL 0.7	5 Wnw Dale, TX	TWITTER REPORT FROM NEAR FM1185 AND BARTH RD.
May 4, 7:30 AM CDT	HAIL 0.88	8 Ene Dale, TX	CORRECTS PREVIOUS HAIL REPORT FROM 8 ENE DALE.
May 4, 7:30 AM CDT	HAIL 1.5	5 Ssw Bastrop, TX	PUBLIC REPORT OF QUARTER TO PING PONG BALL SIZED HAIL. ONLY LASTED ABOUT 5 MINUTES.
May 4, 7:32 AM CDT	HAIL 0.88	6 Ssw Bastrop, TX
May 4, 7:38 AM CDT	HAIL 0.5	8 Ene Dale, TX

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

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 11.7 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.

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: 1737 J/kg
Mixed-layer CIN: -372 J/kg
Mixed-layer LCL: 1458 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

637 
WUUS54 KEWX 041141
SVREWX
TXC021-055-209-453-041245-
/O.NEW.KEWX.SV.W.0101.210504T1141Z-210504T1245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
641 AM CDT Tue May 4 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Caldwell County in south central Texas...
  Southeastern Hays County in south central Texas...
  Southeastern Travis County in south central Texas...
  Southwestern Bastrop County in south central Texas...

* Until 745 AM CDT.

* At 641 AM CDT, a severe thunderstorm was located near San Marcos,
  moving northeast at 35 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  San Marcos, Kyle, Buda, Lockhart, Bastrop, Martindale, Uhland,
  Mustang Ridge, Niederwald, Cedar Creek, Wyldwood, Camp Swift,
  Webberville, Creedmoor, Phelan, Hills Prairie, Garfield, Rockne,
  Watterson and Maha.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2985 9765 2983 9785 2985 9786 2985 9788
      2983 9792 2982 9798 2991 9807 3025 9750
      3014 9730 2996 9727
TIME...MOT...LOC 1141Z 243DEG 30KT 2991 9790 

HAIL...1.00IN
WIND...<50MPH
 
$$

HAMPSHIRE

5 follow-up statements

465 
WWUS54 KEWX 041155
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
655 AM CDT Tue May 4 2021

TXC021-055-209-453-041245-
/O.CON.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Caldwell TX-Hays TX-Travis TX-Bastrop TX-
655 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHWESTERN CALDWELL...SOUTHEASTERN HAYS...SOUTHEASTERN TRAVIS
AND SOUTHWESTERN BASTROP COUNTIES...

At 655 AM CDT, a severe thunderstorm was located over Uhland, or near
Kyle, moving east at 35 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
San Marcos, Kyle, Lockhart, Bastrop, Martindale, Uhland, Mustang
Ridge, Niederwald, Cedar Creek, Wyldwood, Camp Swift, Webberville,
Creedmoor, Phelan, Hills Prairie, Garfield, Rockne, Watterson, Maha
and Maxwell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2985 9765 2985 9788 2986 9792 2991 9797
      2997 9793 3025 9750 3014 9730 2996 9727
TIME...MOT...LOC 1155Z 247DEG 29KT 2993 9781 

HAIL...1.00IN
WIND...<50MPH
 
$$

HAMPSHIRE

489 
WWUS54 KEWX 041204
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
704 AM CDT Tue May 4 2021

TXC209-453-041214-
/O.CAN.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Hays TX-Travis TX-
704 AM CDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HAYS AND
SOUTHEASTERN TRAVIS COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 2985 9765 2985 9786 2986 9788 2986 9790
      2991 9786 2994 9780 2999 9776 3016 9755
      3018 9747 3014 9730 2996 9727
TIME...MOT...LOC 1204Z 253DEG 28KT 2993 9774 

$$

TXC021-055-041245-
/O.CON.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Caldwell TX-Bastrop TX-
704 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHWESTERN CALDWELL AND SOUTHWESTERN BASTROP COUNTIES...

At 704 AM CDT, a severe thunderstorm was located near Uhland, or near
Lockhart, moving east at 30 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
San Marcos, Lockhart, Bastrop, Martindale, Uhland, Mustang Ridge,
Niederwald, Cedar Creek, Wyldwood, Camp Swift, Hills Prairie, Rockne,
Watterson, San Marcos Regional Airport, Maxwell, Reedville, Red Rock,
Lytton Springs, Dale and Bateman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2985 9765 2985 9786 2986 9788 2986 9790
      2991 9786 2994 9780 2999 9776 3016 9755
      3018 9747 3014 9730 2996 9727
TIME...MOT...LOC 1204Z 253DEG 28KT 2993 9774 

HAIL...1.00IN
WIND...<50MPH
 
$$

HAMPSHIRE

890 
WWUS54 KEWX 041215
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
715 AM CDT Tue May 4 2021

TXC021-055-041245-
/O.CON.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Caldwell TX-Bastrop TX-
715 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTH CENTRAL CALDWELL AND SOUTHWESTERN BASTROP COUNTIES...

At 715 AM CDT, a severe thunderstorm was located near Lockhart,
moving northeast at 35 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Lockhart, Bastrop, Mustang Ridge, Cedar Creek, Wyldwood, Camp Swift,
Hills Prairie, Rockne, Watterson, Red Rock, Lytton Springs, Dale,
Bateman, St John Colony, Mendoza and Taylorsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2985 9765 2989 9773 2998 9771 3016 9755
      3018 9747 3014 9730 2996 9727
TIME...MOT...LOC 1215Z 245DEG 30KT 2996 9764 

HAIL...1.00IN
WIND...<50MPH
 
$$

HAMPSHIRE

209 
WWUS54 KEWX 041219
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
719 AM CDT Tue May 4 2021

TXC021-055-041245-
/O.CON.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Caldwell TX-Bastrop TX-
719 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTH CENTRAL CALDWELL AND SOUTHWESTERN BASTROP COUNTIES...

At 719 AM CDT, a severe thunderstorm was located near Cedar Creek, or
12 miles southwest of Bastrop, moving east at 15 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Trained weather spotters.

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

Locations impacted include...
Lockhart, Bastrop, Cedar Creek, Wyldwood, Camp Swift, Hills Prairie,
Rockne, Watterson, Red Rock, Lytton Springs, Dale, Bateman, St John
Colony and Taylorsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2985 9765 2989 9772 2997 9769 3016 9755
      3018 9747 3014 9730 2996 9727
TIME...MOT...LOC 1219Z 255DEG 14KT 2999 9748 

HAIL...1.50IN
WIND...<50MPH
 
$$

HAMPSHIRE

374 
WWUS54 KEWX 041228
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
728 AM CDT Tue May 4 2021

TXC055-041238-
/O.CAN.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Caldwell TX-
728 AM CDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CALDWELL COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 2991 9746 3005 9763 3011 9758 3017 9744
      3014 9730 2996 9727
TIME...MOT...LOC 1228Z 244DEG 31KT 3002 9739 

$$

TXC021-041245-
/O.CON.KEWX.SV.W.0101.000000T0000Z-210504T1245Z/
Bastrop TX-
728 AM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR SOUTHWESTERN BASTROP COUNTY...

At 728 AM CDT, a severe thunderstorm was located 7 miles southwest of
Bastrop, moving northeast at 35 mph.

HAZARD...Half dollar size hail.

SOURCE...Trained weather spotters.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Bastrop, Cedar Creek, Wyldwood, Camp Swift, Red Rock, Hills Prairie,
Rockne, Watterson and Bateman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2991 9746 3005 9763 3011 9758 3017 9744
      3014 9730 2996 9727
TIME...MOT...LOC 1228Z 244DEG 31KT 3002 9739 

HAIL...1.25IN
WIND...<50MPH
 
$$

HAMPSHIRE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:10 PM CDT	Special Weather Statement	EWX	Kendall	50 min
May 3, 7:12 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Medina	63 min
May 3, 7:14 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Bexar, Blanco, Gillespie, Kendall, Kerr and 1 more	61 min
May 3, 7:30 PM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Comal, Kendall, Medina	3 hr
May 3, 7:49 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Comal, Guadalupe	56 min
May 3, 8:12 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Gillespie, Kendall, Llano	48 min
May 3, 8:19 PM CDT	Areal Flood Advisory	EWX	Bexar, Guadalupe, Wilson	3 hr
May 3, 8:23 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Guadalupe, Wilson	22 min
May 3, 8:43 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Gonzales, Guadalupe, Wilson	62 min
May 3, 8:53 PM CDT	Special Weather Statement	EWX	Burnet	52 min
May 3, 8:58 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Llano, Travis, Williamson	62 min
May 3, 9:16 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano, Travis, Williamson	41 min
May 3, 10:08 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	30 min
May 4, 6:33 AM CDT	Special Weather Statement	EWX	Caldwell	42 min
May 4, 7:25 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Travis	50 min
May 4, 7:37 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Fayette, Lee	53 min
May 4, 8:05 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Travis, Williamson	13 min
May 4, 8:20 AM CDT	Special Weather Statement	EWX	Hays, Travis	40 min
May 4, 8:22 AM CDT	Special Weather Statement	EWX	Lee	38 min
May 4, 8:22 AM CDT	Special Weather Statement	EWX	Lee	38 min
May 4, 8:25 AM CDT	Special Weather Statement	EWX	Lee	35 min
May 4, 8:59 AM CDT	Special Weather Statement	EWX	Hays, Travis	46 min
May 4, 9:27 AM CDT	Special Weather Statement	EWX	Guadalupe	33 min
May 4, 9:48 AM CDT	Special Weather Statement	EWX	Bastrop	27 min
May 4, 9:58 AM CDT	Special Weather Statement	EWX	Caldwell	47 min
May 4, 10:04 AM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Fayette	41 min
May 4, 10:38 AM CDT	Special Weather Statement	EWX	Bastrop	37 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.