Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Austin/San Antonio, TX

April 15, 20214 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 15, 2021, 1:07 PM CDT for 4 counties in Texas. It was in force for 53 min. 3 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 15, 2021, 1:07 PM CDT (18:07 UTC)
Expired
Apr 15, 2021, 2:00 PM CDT
In force
53 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Blanco County, TX, Burnet County, TX, Llano County, TX, Travis County, TX

The radar

The Ft Hood radar (KGRK), 84 km from the middle of the area, began a volume at 18:09 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 15, 1:10 PM CDTHAIL 0.79 Sse Llano, TXHAIL UP TO DIME SIZE 9 SSE LLANO ALONG CR 312.
Apr 15, 1:15 PM CDTHAIL 0.59 Ne Enchanted Rock Sta, TXHALF INCH HAIL REPORTED 13 S LLANO VIA SOCIAL MEDIA.
Apr 15, 1:55 PM CDTHAIL 0.55 Ssw Bertram, TXBRT133 REPORTS HALF INCH HAIL AT 155PM LOCAL TIME.

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 15, 8:36 AM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 6.1 hours before the alert went out and 264 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, Fort Worth, TX at 12:00Z on 2021-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Fort Worth, TX at 12:00Z on 2021-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
629 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

299 
WUUS54 KEWX 151807
SVREWX
TXC031-053-299-453-151900-
/O.NEW.KEWX.SV.W.0042.210415T1807Z-210415T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
107 PM CDT Thu Apr 15 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Travis County in south central Texas...
  Northern Blanco County in south central Texas...
  Southeastern Llano County in south central Texas...
  Southwestern Burnet County in south central Texas...

* Until 200 PM CDT.

* At 106 PM CDT, a severe thunderstorm was located near Oxford, or 11
  miles southwest of Kingsland, moving east at 35 mph.

  HAZARD...Ping pong 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, Marble Falls, Kingsland, Bertram, Round Mountain,
  Gainesville, Lago Vista, Granite Shoals, Horseshoe Bay,
  Meadowlakes, Highland Haven, Spicewood, Oatmeal, Longhorn Cavern 
  State Park, Smithwick, Oxford, Briarcliff, Cottonwood Shores, and 
  Sunrise Beach Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.

&&

LAT...LON 3075 9801 3070 9801 3062 9805 3061 9803
      3063 9800 3042 9799 3047 9859 3050 9859
      3050 9870 3066 9871
TIME...MOT...LOC 1806Z 267DEG 32KT 3057 9861 

HAIL...1.50IN
WIND...60MPH
 
$$

BF
2 follow-up statements
242 
WWUS54 KEWX 151833
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
133 PM CDT Thu Apr 15 2021

TXC031-151842-
/O.CAN.KEWX.SV.W.0042.000000T0000Z-210415T1900Z/
Blanco TX-
133 PM CDT Thu Apr 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BLANCO 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 300 PM CDT for
south central Texas.

LAT...LON 3075 9801 3070 9801 3062 9805 3061 9803
      3063 9800 3062 9800 3042 9799 3049 9837
      3050 9840 3052 9855 3067 9859
TIME...MOT...LOC 1832Z 267DEG 32KT 3058 9834 

$$

TXC053-299-453-151900-
/O.CON.KEWX.SV.W.0042.000000T0000Z-210415T1900Z/
Travis TX-Llano TX-Burnet TX-
133 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR NORTHWESTERN TRAVIS...SOUTHEASTERN LLANO AND SOUTHWESTERN BURNET
COUNTIES...

At 132 PM CDT, a severe thunderstorm was located over Granite Shoals,
or near Marble Falls, moving east at 35 mph.

HAZARD...Ping pong 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, Marble Falls, Kingsland, Bertram, Gainesville, Lago Vista,
Granite Shoals, Horseshoe Bay, Meadowlakes, Highland Haven,
Spicewood, Oatmeal, Longhorn Cavern State Park, Smithwick, Cottonwood
Shores and Sunrise Beach Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3075 9801 3070 9801 3062 9805 3061 9803
      3063 9800 3062 9800 3042 9799 3049 9837
      3050 9840 3052 9855 3067 9859
TIME...MOT...LOC 1832Z 267DEG 32KT 3058 9834 

HAIL...1.50IN
WIND...60MPH
 
$$

BF
659 
WWUS54 KEWX 151854
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
154 PM CDT Thu Apr 15 2021

TXC299-453-151904-
/O.CAN.KEWX.SV.W.0042.000000T0000Z-210415T1900Z/
Travis TX-Llano TX-
154 PM CDT Thu Apr 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TRAVIS AND
SOUTHEASTERN LLANO COUNTIES 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 300 PM CDT for
south central Texas.

LAT...LON 3075 9801 3070 9801 3050 9812 3048 9812
      3050 9810 3046 9810 3053 9826 3071 9827
TIME...MOT...LOC 1854Z 267DEG 32KT 3059 9811 

$$

TXC053-151900-
/O.CON.KEWX.SV.W.0042.000000T0000Z-210415T1900Z/
Burnet TX-
154 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM CDT
FOR SOUTH CENTRAL BURNET COUNTY...

At 154 PM CDT, a severe thunderstorm was located over Smithwick, or 9
miles east of Marble Falls, 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...
Burnet, Marble Falls, Bertram, Smithwick, and Oatmeal. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3075 9801 3070 9801 3050 9812 3048 9812
      3050 9810 3046 9810 3053 9826 3071 9827
TIME...MOT...LOC 1854Z 267DEG 32KT 3059 9811 

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

BF

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 7:34 AM CDTSpecial Weather StatementEWXKinney41 min
Apr 15, 8:12 AM CDTSpecial Weather StatementEWXEdwards48 min
Apr 15, 8:14 AM CDTSpecial Weather StatementEWXKinney46 min
Apr 15, 8:31 AM CDTSevere Thunderstorm WarningEWXEdwards, Val Verde59 min
Apr 15, 8:40 AM CDTSevere Thunderstorm WarningEWXKinney65 min
Apr 15, 8:55 AM CDTSpecial Weather StatementEWXEdwards50 min
Apr 15, 9:04 AM CDTSevere Thunderstorm WarningEWXEdwards24 min
Apr 15, 9:32 AM CDTSevere Thunderstorm WarningEWXEdwards17 min
Apr 15, 9:42 AM CDTSevere Thunderstorm WarningEWXKinney, Uvalde63 min
Apr 15, 10:42 AM CDTSevere Thunderstorm WarningEWXUvalde45 min
Apr 15, 12:15 PM CDTSevere Thunderstorm WarningEWXGillespie, Llano60 min
Apr 15, 1:52 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson36 min
Apr 15, 2:07 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson40 min
Apr 15, 2:57 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano63 min
Apr 15, 3:21 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson54 min
Apr 15, 3:56 PM CDTSevere Thunderstorm WarningEWXTravis, Williamson49 min
Apr 15, 4:11 PM CDTSpecial Weather StatementEWXWilliamson49 min
Apr 15, 4:36 PM CDTSevere Thunderstorm WarningEWXBastrop, Lee, Travis, Williamson54 min
Apr 15, 5:22 PM CDTSevere Thunderstorm WarningEWXBastrop, Fayette, Lee29 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.