Alert archive / Texas / Tornado Warnings in 2020

Tornado Warning 9, NWS Austin/San Antonio, TX

April 12, 2020Burnet County, Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Apr 12, 2020, 5:40 AM CDT for Burnet County, Travis County, Williamson County, Texas. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 12, 2020, 5:40 AM CDT (10:40 UTC)
Expired: Apr 12, 2020, 6:15 AM CDT
In force: 35 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Burnet County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 66 km from the middle of the area, began a volume at 10:44 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 12, 1:59 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 10.7 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-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: 509 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

As transmitted.

098 
WFUS54 KEWX 121040
TOREWX
TXC053-453-491-121115-
/O.NEW.KEWX.TO.W.0009.200412T1040Z-200412T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Austin/San Antonio TX
540 AM CDT Sun Apr 12 2020

The National Weather Service in Austin San Antonio has issued a

* Tornado Warning for...
  Southwestern Williamson County in south central Texas...
  Northwestern Travis County in south central Texas...
  South central Burnet County in south central Texas...

* Until 615 AM CDT.
    
* At 540 AM CDT, a severe thunderstorm capable of producing a tornado
  was located over Spicewood, or 7 miles southeast of Marble Falls,
  moving east at 35 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Cedar Park, Marble Falls, Anderson Mill, Leander, Lago Vista,
  Hudson Bend, Meadowlakes, Liberty Hill, Spicewood, Smithwick,
  Jonestown, Briarcliff, Volente, Seward Junction, Jollyville and
  Brushy Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3072 9783 3046 9774 3040 9814 3043 9813
      3046 9827 3058 9830
TIME...MOT...LOC 1040Z 253DEG 32KT 3050 9819 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

KCW

2 follow-up statements

836 
WWUS54 KEWX 121055
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
555 AM CDT Sun Apr 12 2020

TXC053-121104-
/O.CAN.KEWX.TO.W.0009.000000T0000Z-200412T1115Z/
Burnet TX-
555 AM CDT Sun Apr 12 2020

...THE TORNADO WARNING FOR SOUTH CENTRAL BURNET COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 AM CDT for south central
Texas.

LAT...LON 3046 9774 3041 9807 3047 9810 3049 9810
      3049 9811 3051 9811 3066 9803 3068 9798
      3072 9783
TIME...MOT...LOC 1054Z 252DEG 33KT 3054 9804 

$$

TXC453-491-121115-
/O.CON.KEWX.TO.W.0009.000000T0000Z-200412T1115Z/
Williamson TX-Travis TX-
555 AM CDT Sun Apr 12 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR
SOUTHWESTERN WILLIAMSON AND NORTHWESTERN TRAVIS COUNTIES...
    
At 554 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Smithwick, or 12 miles west of Cedar Park, moving
east at 40 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Cedar Park, Anderson Mill, Leander, Lago Vista, Hudson Bend, Liberty
Hill, Jonestown, Briarcliff, Volente, Seward Junction, Jollyville and
Brushy Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3046 9774 3041 9807 3047 9810 3049 9810
      3049 9811 3051 9811 3066 9803 3068 9798
      3072 9783
TIME...MOT...LOC 1054Z 252DEG 33KT 3054 9804 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

KCW

750 
WWUS54 KEWX 121111
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
611 AM CDT Sun Apr 12 2020

TXC453-491-121121-
/O.EXP.KEWX.TO.W.0009.000000T0000Z-200412T1115Z/
Williamson TX-Travis TX-
611 AM CDT Sun Apr 12 2020

...THE TORNADO WARNING FOR SOUTHWESTERN WILLIAMSON AND NORTHWESTERN
TRAVIS COUNTIES WILL EXPIRE AT 615 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However heavy 
rain is still possible with this thunderstorm and we will continue 
to watch for any potential additional spin-ups.

A Tornado Watch remains in effect until 800 AM CDT for south central
Texas.

LAT...LON 3046 9774 3041 9807 3047 9810 3049 9810
      3049 9811 3051 9811 3066 9803 3068 9798
      3072 9783
TIME...MOT...LOC 1111Z 253DEG 32KT 3058 9789 

$$

KCW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:42 PM CDT	Special Weather Statement	EWX	Val Verde	48 min
Apr 11, 7:57 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	49 min
Apr 11, 8:30 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Val Verde	60 min
Apr 11, 8:58 PM CDT	Tornado Warning	EWX	Kinney, Uvalde	32 min
Apr 11, 9:27 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Uvalde	48 min
Apr 11, 10:11 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	64 min
Apr 11, 10:15 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
Apr 11, 11:11 PM CDT	Special Weather Statement	EWX	Medina	49 min
Apr 12, 12:05 AM CDT	Special Weather Statement	EWX	Edwards	40 min
Apr 12, 12:17 AM CDT	Special Weather Statement	EWX	Val Verde	43 min
Apr 12, 12:53 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	67 min
Apr 12, 1:16 AM CDT	Special Weather Statement	EWX	Edwards	44 min
Apr 12, 1:53 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr, Real	67 min
Apr 12, 2:01 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	25 min
Apr 12, 2:23 AM CDT	Wind Advisory	EWX	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more	17 hr
Apr 12, 2:29 AM CDT	Severe Thunderstorm Warning	EWX	Edwards, Real	47 min
Apr 12, 3:05 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr, Real	40 min
Apr 12, 3:44 AM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Kendall, Kerr	46 min
Apr 12, 3:48 AM CDT	Severe Thunderstorm Warning	EWX	Burnet, Gillespie, Llano	57 min
Apr 12, 4:04 AM CDT	Tornado Warning	EWX	Llano	26 min
Apr 12, 4:06 AM CDT	Special Weather Statement	EWX	Gillespie	39 min
Apr 12, 4:20 AM CDT	Red Flag Warning	EWX	Atascosa, Dimmit, Frio, Kinney, Maverick, Val Verde and 1 more	17 hr
Apr 12, 4:27 AM CDT	Special Weather Statement	EWX	Gillespie	48 min
Apr 12, 4:39 AM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	66 min
Apr 12, 4:42 AM CDT	Tornado Warning	EWX	Blanco, Gillespie, Llano	33 min
Apr 12, 5:08 AM CDT	Tornado Warning	EWX	Blanco, Burnet, Llano	37 min
Apr 12, 5:34 AM CDT	Severe Thunderstorm Warning	EWX	Burnet	20 min
Apr 12, 6:10 AM CDT	Special Weather Statement	EWX	Williamson	50 min
Apr 12, 6:28 AM CDT	Special Weather Statement	EWX	Williamson	47 min

Nearby

Tornado Warnings in Texas, 2020 Every tornado warning in 2020 Tornadoes in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.