Alert archive / Texas / Tornado Warnings in 2020

Tornado Warning 8, NWS Austin/San Antonio, TX

April 12, 2020Blanco County, Burnet County, Llano County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Apr 12, 2020, 5:08 AM CDT for Blanco County, Burnet County, Llano County, Texas. It was in force for 37 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 12, 2020, 5:08 AM CDT (10:08 UTC)
Expired: Apr 12, 2020, 5:45 AM CDT
In force: 37 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

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

The radar

The Austin/San Antonio radar (KEWX), 96 km from the middle of the area, began a volume at 10:08 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
Apr 12, 5:27 AM CDT	TORNADO	2 Nne Round Mountain, TX	DAMAGE HAS BEEN REPORTED AT HOFBRAU RV PARK JUST NORTH OF ROUND MOUNTAIN ALONG US HIGHWAY 281 COINCIDENT WITH WHERE A STRONG ROTATIONAL SIGNATURE ON RADAR TRAVERSED. DAMAGE INCLUDES TREES DOWNED/UPROOTED AND SOME DAMAGE TO RVS. A DUAL POL TORNADO DEBRIS SIGNAT

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
Apr 12, 1:59 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 10.1 hours before the alert went out and 268 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: 3028 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1174 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 286 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 23.5

Open this sounding in Storm Lab

The text

As transmitted.

899 
WFUS54 KEWX 121008
TOREWX
TXC031-053-299-121045-
/O.NEW.KEWX.TO.W.0008.200412T1008Z-200412T1045Z/

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

The National Weather Service in Austin San Antonio has issued a

* Tornado Warning for...
  Northwestern Blanco County in south central Texas...
  Southeastern Llano County in south central Texas...
  Southwestern Burnet County in south central Texas...

* Until 545 AM CDT.
    
* At 507 AM CDT, a severe thunderstorm capable of producing a tornado
  was located over Blowout, or 12 miles west of Round Mountain,
  moving northeast 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...
  Marble Falls, Round Mountain, Granite Shoals, Horseshoe Bay,
  Meadowlakes, Spicewood, Blowout, Cottonwood Shores and Sunrise
  Beach Village.

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 3066 9824 3047 9813 3035 9856 3041 9860
      3050 9859
TIME...MOT...LOC 1007Z 244DEG 35KT 3043 9855 

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

$$

KCW

2 follow-up statements

950 
WWUS54 KEWX 121023
SVSEWX

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

TXC031-053-299-121045-
/O.CON.KEWX.TO.W.0008.000000T0000Z-200412T1045Z/
Blanco TX-Llano TX-Burnet TX-
523 AM CDT Sun Apr 12 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 AM CDT FOR NORTH
CENTRAL BLANCO...SOUTHEASTERN LLANO AND SOUTHWESTERN BURNET
COUNTIES...
    
At 523 AM CDT, a severe thunderstorm capable of producing a tornado
was located near Horseshoe Bay, or near Round Mountain, moving
northeast 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...
Marble Falls, Round Mountain, Granite Shoals, Horseshoe Bay,
Meadowlakes, Spicewood, Cottonwood Shores and Sunrise Beach Village.

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 3066 9824 3047 9813 3040 9839 3054 9849
TIME...MOT...LOC 1023Z 244DEG 35KT 3050 9839 

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

$$

KCW

219 
WWUS54 KEWX 121034
SVSEWX

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

TXC299-121044-
/O.CAN.KEWX.TO.W.0008.000000T0000Z-200412T1045Z/
Llano TX-
534 AM CDT Sun Apr 12 2020

...THE TORNADO WARNING FOR SOUTHEASTERN LLANO 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 3061 9821 3047 9813 3042 9831 3050 9839
      3050 9838 3049 9837 3049 9835 3054 9835
TIME...MOT...LOC 1034Z 247DEG 30KT 3048 9827 

$$

TXC031-053-121045-
/O.CON.KEWX.TO.W.0008.000000T0000Z-200412T1045Z/
Blanco TX-Burnet TX-
534 AM CDT Sun Apr 12 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 AM CDT FOR NORTH
CENTRAL BLANCO AND SOUTHWESTERN BURNET COUNTIES...
        
At 534 AM CDT, a confirmed tornado was located near Round Mountain,
moving east at 35 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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...
Marble Falls, Round Mountain, Horseshoe Bay, Meadowlakes, Spicewood
and Cottonwood Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3061 9821 3047 9813 3042 9831 3050 9839
      3050 9838 3049 9837 3049 9835 3054 9835
TIME...MOT...LOC 1034Z 247DEG 30KT 3048 9827 

TORNADO...OBSERVED
HAIL...<.75IN

$$

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, 5:34 AM CDT	Severe Thunderstorm Warning	EWX	Burnet	20 min
Apr 12, 5:40 AM CDT	Tornado Warning	EWX	Burnet, Travis, Williamson	35 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.