Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 47, NWS Austin/San Antonio, TX

April 15, 2021Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 15, 2021, 3:56 PM CDT for Travis County, Williamson County, Texas. It was in force for 49 min. 15 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, 3:56 PM CDT (20:56 UTC)
Expired
Apr 15, 2021, 4:45 PM CDT
In force
49 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
2.5 in
Wind
60.0 mph

Counties Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 33 km from the middle of the area, began a volume at 20:58 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, 4:00 PM CDTHAIL 1.25Liberty Hill, TXHAIL COVERING THE GROUND.
Apr 15, 4:02 PM CDTHAIL 1.54 Ese Liberty Hill, TX
Apr 15, 4:05 PM CDTHAIL 21 Ese Leander, TX2 INCH HAIL AT THE INTERSECTION OF 183 AND CRYSTAL FALLS PKWY.
Apr 15, 4:08 PM CDTHAIL 1.51 Nne Leander, TX
Apr 15, 4:08 PM CDTHAIL 1.55 Ne Leander, TXPING PONG SIZE HAIL AT LAKE SIDE DRIVE AND LAKE SIDE COVE.
Apr 15, 4:09 PM CDTHAIL 1.753 Ne Cedar Park, TX
Apr 15, 4:11 PM CDTHAIL 21 Nne Leander, TX
Apr 15, 4:15 PM CDTHAIL 1.751 Ene Cedar Park, TX
Apr 15, 4:17 PM CDTHAIL 1.753 Sse Brushy Creek, TXGOLF BALL SIZE HAIL AT OCONNER AND 620.
Apr 15, 4:23 PM CDTHAIL 1.752 Ne Brushy Creek, TX
Apr 15, 4:25 PM CDTHAIL 22 Nw Windemere, TX
Apr 15, 4:29 PM CDTHAIL 23 Ene Pflugerville, TXTWO INCH HAIL NEAR PFLUGERVILLE DENTED A CAR AND BROKE A CAR WINDOW.
Apr 15, 4:35 PM CDTHAIL 12 E Pflugerville, TX
Apr 15, 4:36 PM CDTHAIL 24 Ene Pflugerville, TX
Apr 15, 4:44 PM CDTHAIL 2.53 Nne Pflugerville, TX

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, 8.9 hours before the alert went out and 266 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.

695 
WUUS54 KEWX 152056
SVREWX
TXC453-491-152145-
/O.NEW.KEWX.SV.W.0047.210415T2056Z-210415T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
356 PM CDT Thu Apr 15 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southern Williamson County in south central Texas...
  Northeastern Travis County in south central Texas...

* Until 445 PM CDT.

* At 356 PM CDT, a severe thunderstorm was located over Liberty Hill,
  or 10 miles southeast of Bertram, moving southeast at 45 mph.

  HAZARD...Tennis ball size hail and 60 mph wind gusts.

  SOURCE...Public.

  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...
  Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
  Elgin, Anderson Mill, Windemere, Leander, Hutto, Manor, Liberty
  Hill, Georgetown Dam, Coupland, Hornsby Bend, Jonestown,
  Webberville, Wells Branch and Rices Crossing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building, and stay away from windows.

&&

LAT...LON 3050 9721 3042 9728 3040 9733 3042 9736
      3041 9738 3022 9749 3019 9751 3059 9805
      3075 9795
TIME...MOT...LOC 2056Z 298DEG 37KT 3064 9792 

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

KCW
3 follow-up statements
484 
WWUS54 KEWX 152109
SVSEWX

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

TXC453-491-152145-
/O.CON.KEWX.SV.W.0047.000000T0000Z-210415T2145Z/
Williamson TX-Travis TX-
409 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHERN WILLIAMSON AND NORTHEASTERN TRAVIS COUNTIES...

At 408 PM CDT, a severe thunderstorm was located near Leander, or
near Cedar Park, moving southeast at 45 mph.

HAZARD...Golf 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...
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
Elgin, Anderson Mill, Windemere, Leander, Hutto, Manor, Liberty Hill,
Georgetown Dam, Coupland, Hornsby Bend, Jonestown, Webberville, Rices
Crossing and Brushy Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

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 3050 9721 3042 9728 3040 9733 3042 9736
      3041 9738 3022 9749 3019 9751 3051 9794
      3071 9782
TIME...MOT...LOC 2108Z 297DEG 37KT 3058 9779 

HAIL...1.75IN
WIND...60MPH
 
$$

KCW
138 
WWUS54 KEWX 152118
SVSEWX

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

TXC453-491-152145-
/O.CON.KEWX.SV.W.0047.000000T0000Z-210415T2145Z/
Williamson TX-Travis TX-
418 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN WILLIAMSON AND NORTHEASTERN TRAVIS COUNTIES...

At 418 PM CDT, a severe thunderstorm was located over Round Rock,
moving southeast at 45 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...
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
Elgin, Anderson Mill, Windemere, Hutto, Manor, Georgetown Dam,
Coupland, Hornsby Bend, Webberville, Rices Crossing, Brushy Creek,
Beyarsville, Wells Branch and Jollyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

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 3050 9721 3042 9728 3040 9733 3042 9736
      3041 9738 3022 9749 3019 9751 3044 9785
      3068 9772
TIME...MOT...LOC 2118Z 298DEG 37KT 3053 9768 

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

KCW
977 
WWUS54 KEWX 152129
SVSEWX

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

TXC453-491-152145-
/O.CON.KEWX.SV.W.0047.000000T0000Z-210415T2145Z/
Williamson TX-Travis TX-
429 PM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN WILLIAMSON AND NORTHEASTERN TRAVIS COUNTIES...

At 429 PM CDT, a severe thunderstorm was located over Pflugerville,
moving southeast at 45 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

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...
Austin, Round Rock, Pflugerville, Taylor, Elgin, Windemere, Hutto,
Manor, Coupland, Hornsby Bend, Webberville, Rices Crossing,
Beyarsville, Wells Branch and Garfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

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 3050 9721 3042 9728 3040 9733 3042 9736
      3041 9738 3022 9749 3019 9751 3042 9773
      3062 9762
TIME...MOT...LOC 2129Z 298DEG 37KT 3047 9756 

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

KCW

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, 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, 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.