Alert archive / Texas / Tornado Warnings in 2012

Tornado Warning 12, NWS Austin/San Antonio, TX

May 7, 2012Llano County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 7, 2012, 5:10 PM CDT for Llano County, Texas. It was in force for 35 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: May 7, 2012, 5:10 PM CDT (22:10 UTC)
Expired: May 7, 2012, 5:45 PM CDT
In force: 35 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Llano County, TX

The radar

The Austin/San Antonio radar (KEWX), 132 km from the middle of the area, began a volume at 22:12 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
May 7, 5:15 PM CDT	HAIL 1	6 Wsw Llano, TX	PEA TO NEAR QUARTER SIZE HAIL NEAR LLANO.
May 7, 5:25 PM CDT	HAIL 1.75	1 N Castell, TX	GOLFBALL SIZE HAIL.
May 7, 5:29 PM CDT	TORNADO	4 Se Castell, TX	TORNADO REPORT BY THE SHERIFF ON COUNTY ROAD 105.

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
May 7, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 10.2 hours before the alert went out and 241 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: 3104 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

638 
WFUS54 KEWX 072210
TOREWX
TXC299-072245-
/O.NEW.KEWX.TO.W.0012.120507T2210Z-120507T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
510 PM CDT MON MAY 7 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN LLANO COUNTY...

* UNTIL 545 PM CDT.

* AT 508 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR CASTELL...OR ABOUT
  15 MILES WEST OF LLANO...MOVING SOUTHEAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE PRAIRIE MOUNTAIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN A MOBILE HOME OR VEHICLE...GET OUT AND GO TO A STURDY
SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
MONDAY EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3066 9859 3051 9894 3059 9898 3075 9898
      3083 9894
TIME...MOT...LOC 2210Z 296DEG 19KT 3068 9891

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 7:09 PM CDT	Areal Flood Advisory	EWX	Llano	111 min
May 6, 7:33 PM CDT	Severe Thunderstorm Warning	EWX	Llano	42 min
May 7, 3:28 AM CDT	Flash Flood Watch	EWX	Bandera, Bexar, Blanco, Burnet, Comal, Edwards and 12 more	37 hr
May 7, 4:47 PM CDT	Severe Thunderstorm Warning	EWX	Llano	58 min
May 7, 5:23 PM CDT	Severe Thunderstorm Warning	EWX	Llano	37 min
May 7, 5:32 PM CDT	Tornado Warning	EWX	Gillespie, Llano	28 min
May 7, 5:43 PM CDT	Tornado Warning	EWX	Llano	32 min
May 7, 5:57 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Gillespie, Llano	63 min
May 7, 6:08 PM CDT	Areal Flood Advisory	EWX	Llano	112 min
May 7, 6:49 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie, Kendall	56 min
May 7, 6:51 PM CDT	Areal Flood Advisory	EWX	Gillespie	2 hr

Nearby

Tornado Warnings in Texas, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.