Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 139, NWS Austin/San Antonio, TX

May 28, 2021Burnet County, Llano County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 28, 2021, 4:38 PM CDT for Burnet County, Llano County, Texas. It was in force for 52 min. 1 report 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 28, 2021, 4:38 PM CDT (21:38 UTC)
Expired: May 28, 2021, 5:30 PM CDT
In force: 52 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Burnet County, TX, Llano County, TX

The radar

The Ft Hood radar (KGRK), 92 km from the middle of the area, began a volume at 21:40 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

Time	Report	Where	Remark
May 28, 5:05 PM CDT	HAIL 1.75	2 Sw Tow, TX	GOLF BALL SIZED HAIL REPORTED BETWEEN TOW AND BLUFFTON, RELAYED VIA HAM. LOCATION MARKER IS APPROXIMATE.

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.

Issued	Product	Office	Lasted
May 28, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.6 hours before the alert went out and 231 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: 313 J/kg
Mixed-layer CIN: -386 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted.

639 
WUUS54 KEWX 282138
SVREWX
TXC053-299-282230-
/O.NEW.KEWX.SV.W.0139.210528T2138Z-210528T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
438 PM CDT Fri May 28 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northeastern Llano County in south central Texas...
  Northern Burnet County in south central Texas...

* Until 530 PM CDT.

* At 437 PM CDT, a severe thunderstorm was located near Tow, or 15
  miles northwest of Buchanan Dam, moving east at 35 mph.

  HAZARD...Two inch 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...
  Burnet, Bertram, Buchanan Lake Village, Lake Victor, Baby Head,
  Sunnylane, Joppa, Watson, Bluffton, Briggs, Tow and Shady Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3099 9788 3068 9802 3086 9874 3092 9867
      3092 9842 3094 9841 3096 9845 3098 9844
      3101 9846 3103 9844 3103 9791
TIME...MOT...LOC 2137Z 279DEG 29KT 3095 9851 

HAIL...2.00IN
WIND...60MPH
 
$$

CP

2 follow-up statements

263 
WWUS54 KEWX 282152
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
452 PM CDT Fri May 28 2021

TXC053-299-282230-
/O.CON.KEWX.SV.W.0139.000000T0000Z-210528T2230Z/
Llano TX-Burnet TX-
452 PM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHEASTERN LLANO AND NORTHERN BURNET COUNTIES...

At 451 PM CDT, a severe thunderstorm was located near Tow, or 12
miles north of Buchanan Dam, moving east at 35 mph.

HAZARD...Tennis 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...
Burnet, Bertram, Buchanan Lake Village, Lake Victor, Baby Head,
Sunnylane, Joppa, Watson, Bluffton, Briggs, Tow and Shady Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Buchanan, 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 3099 9788 3068 9802 3086 9874 3092 9867
      3092 9842 3094 9841 3096 9845 3098 9844
      3101 9846 3103 9844 3103 9791
TIME...MOT...LOC 2151Z 279DEG 29KT 3093 9838 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...60MPH
 
$$

CP

497 
WWUS54 KEWX 282204
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
504 PM CDT Fri May 28 2021

TXC053-299-282230-
/O.CON.KEWX.SV.W.0139.000000T0000Z-210528T2230Z/
Llano TX-Burnet TX-
504 PM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHEASTERN LLANO AND NORTHERN BURNET COUNTIES...

At 503 PM CDT, a severe thunderstorm was located over Buchanan Lake
Village, or 8 miles north of Buchanan Dam, moving southeast at 20
mph.

This is a very dangerous storm.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Burnet, Bertram, Buchanan Lake Village, Lake Victor, Sunnylane,
Joppa, Watson, Bluffton, Briggs, Tow and Shady Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Buchanan, 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 3099 9788 3068 9802 3085 9869 3092 9857
      3092 9842 3094 9841 3096 9845 3098 9844
      3101 9846 3103 9844 3103 9791
TIME...MOT...LOC 2203Z 293DEG 19KT 3088 9842 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...60MPH
 
$$

CP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:15 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
May 27, 8:15 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
May 27, 8:48 PM CDT	Special Weather Statement	EWX	Val Verde	42 min
May 28, 5:07 PM CDT	Special Weather Statement	EWX	Llano	38 min
May 28, 5:15 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	60 min
May 28, 5:28 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	62 min
May 28, 5:33 PM CDT	Special Weather Statement	EWX	Llano	42 min
May 28, 5:50 PM CDT	Severe Thunderstorm Warning	EWX	Llano	40 min
May 28, 6:06 PM CDT	Areal Flood Advisory	EWX	Burnet, Llano	3 hr
May 28, 6:12 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Travis, Williamson	63 min
May 28, 6:26 PM CDT	Special Weather Statement	EWX	Burnet	34 min
May 28, 6:39 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie	66 min
May 28, 6:46 PM CDT	Areal Flood Advisory	EWX	Travis, Williamson	3 hr

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.