Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Austin/San Antonio, TX

April 15, 2021Burnet County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 15, 2021, 1:52 PM CDT for Burnet County, Williamson County, Texas. It was in force for 36 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
Apr 15, 2021, 1:52 PM CDT (18:52 UTC)
Expired
Apr 15, 2021, 2:28 PM CDT
In force
36 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Burnet County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 49 km from the middle of the area, began a volume at 18:54 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, 1:55 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, 6.9 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-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.

471 
WUUS54 KEWX 151852
SVREWX
TXC053-491-151945-
/O.NEW.KEWX.SV.W.0043.210415T1852Z-210415T1945Z/

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

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Williamson County in south central Texas...
  Central Burnet County in south central Texas...

* Until 245 PM CDT.

* At 151 PM CDT, a severe thunderstorm was located near Oatmeal, or 7
  miles southwest of Bertram, moving east at 40 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...
  Georgetown, Bertram, Serenada, Leander, Liberty Hill, Jarrell,
  Weir, Georgetown Dam, Oatmeal, Sun City, Andice, Theon, Walburg,
  Schwertner, Jonah, and Seward Junction.

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 3083 9752 3061 9742 3059 9792 3060 9792
      3063 9795 3061 9800 3063 9801 3061 9803
      3062 9805 3059 9807 3058 9820 3073 9822
      3086 9759
TIME...MOT...LOC 1851Z 263DEG 35KT 3065 9812 

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

BF
2 follow-up statements
918 
WWUS54 KEWX 151910
SVSEWX

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

TXC053-151919-
/O.CAN.KEWX.SV.W.0043.000000T0000Z-210415T1945Z/
Burnet TX-
210 PM CDT Thu Apr 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BURNET COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled. Another 
Severe Thunderstorm Warning remains in effect farther north.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
south central Texas.

LAT...LON 3083 9752 3061 9742 3059 9792 3060 9792
      3063 9795 3061 9800 3063 9801 3061 9803
      3062 9805 3063 9805 3078 9796 3086 9759
TIME...MOT...LOC 1909Z 263DEG 35KT 3067 9792 

$$

TXC491-151945-
/O.CON.KEWX.SV.W.0043.000000T0000Z-210415T1945Z/
Williamson TX-
210 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR NORTHWESTERN WILLIAMSON COUNTY...

At 209 PM CDT, a severe thunderstorm was located over Liberty Hill,
or 9 miles southeast of Bertram, moving east at 40 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Georgetown, Serenada, Leander, Liberty Hill, Jarrell, Weir, 
Georgetown Dam, Sun City, Andice, Theon, Walburg, Schwertner, Jonah, 
and Seward Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3083 9752 3061 9742 3059 9792 3060 9792
      3063 9795 3061 9800 3063 9801 3061 9803
      3062 9805 3063 9805 3078 9796 3086 9759
TIME...MOT...LOC 1909Z 263DEG 35KT 3067 9792 

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

BF
564 
WWUS54 KEWX 151928
SVSEWX

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

TXC491-151937-
/O.CAN.KEWX.SV.W.0043.000000T0000Z-210415T1945Z/
Williamson TX-
228 PM CDT Thu Apr 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WILLIAMSON COUNTY
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.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
south central Texas.

LAT...LON 3083 9752 3061 9742 3059 9792 3060 9792
      3063 9795 3061 9800 3063 9801 3061 9803
      3062 9805 3063 9805 3078 9796 3086 9759
TIME...MOT...LOC 1927Z 263DEG 35KT 3069 9771 

$$

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, 1:07 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Llano, Travis53 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.