Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Austin/San Antonio, TX

March 19, 2012Medina County, Uvalde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 19, 2012, 5:29 PM CDT for Medina County, Uvalde County, Texas. It was in force for 49 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: Mar 19, 2012, 5:29 PM CDT (22:29 UTC)
Expired: Mar 19, 2012, 6:18 PM CDT
In force: 49 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Medina County, TX, Uvalde County, TX

The radar

The Laughlin AFB radar (KDFX), 84 km from the middle of the area, began a volume at 22:32 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
Mar 19, 5:32 PM CDT	HAIL 1.75	4 S Knippa, TX	GOLFBALL SIZE HAIL REPORTED 4 MILES SOUTH OF HIGHWAY 90 NEAR KNIPPA.

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
Mar 19, 2:39 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 10.5 hours before the alert went out and 137 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: 2784 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 528 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 284 m²/s²
0-3 km storm-relative helicity: 337 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 18.4

Open this sounding in Storm Lab

The text

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

781 
WUUS54 KEWX 192229
SVREWX
TXC325-463-192330-
/O.NEW.KEWX.SV.W.0021.120319T2229Z-120319T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
529 PM CDT MON MAR 19 2012

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MEDINA COUNTY...
  EASTERN UVALDE COUNTY...

* UNTIL 630 PM CDT.

* AT 527 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM
  WAS LOCATED 16 MILES SOUTHWEST OF SABINAL...AND MOVING NORTHEAST
  AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE D'HANIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT MONDAY EVENING
FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2962 9951 2955 9895 2909 9947 2909 9971
TIME...MOT...LOC 2229Z 206DEG 31KT 2913 9957

$$

2 follow-up statements

561 
WWUS54 KEWX 192258
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
558 PM CDT MON MAR 19 2012

TXC325-463-192330-
/O.CON.KEWX.SV.W.0021.000000T0000Z-120319T2330Z/
MEDINA TX-UVALDE TX-
558 PM CDT MON MAR 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHEASTERN UVALDE AND NORTHWESTERN MEDINA COUNTIES...

AT 556 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS
LOCATED OVER EAST CENTRAL UVALDE COUNTY...OR 18 MILES WEST OF
HONDO...MOVING NORTH AT 40 MPH.

THE SEVERE THUNDERSTORM WILL MOVE NORTH ALONG FM 187 AND NEAR FM 
1796. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES. IF A TORNADO IS SPOTTED... ACT
QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS
A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT MONDAY EVENING
FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2962 9951 2955 9895 2935 9933 2937 9957
TIME...MOT...LOC 2257Z 202DEG 36KT 2940 9945

$$

481 
WWUS54 KEWX 192318
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
618 PM CDT MON MAR 19 2012

TXC325-463-192327-
/O.CAN.KEWX.SV.W.0021.000000T0000Z-120319T2330Z/
MEDINA TX-UVALDE TX-
618 PM CDT MON MAR 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN UVALDE AND
NORTHWESTERN MEDINA COUNTIES IS CANCELLED...

THE THUNDERSTORM HAS MOVED NORTH OUT OF THE WARNING AREA. AS A 
RESULT...THE SEVERE THUNDERSTORM WARNING IS CANCELLED. 

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT MONDAY EVENING
FOR SOUTH CENTRAL TEXAS.

LAT...LON 2962 9951 2955 9895 2935 9933 2937 9957
TIME...MOT...LOC 2317Z 202DEG 36KT 2959 9936

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 19, 2:30 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	45 min
Mar 19, 3:06 PM CDT	Tornado Warning	EWX	Edwards, Val Verde	39 min
Mar 19, 4:52 PM CDT	Severe Thunderstorm Warning	EWX	Edwards	53 min
Mar 19, 5:18 PM CDT	Tornado Warning	EWX	Edwards	42 min
Mar 19, 5:50 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina, Zavala	55 min
Mar 19, 5:53 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	32 min
Mar 19, 6:03 PM CDT	Tornado Warning	EWX	Llano	27 min
Mar 19, 6:07 PM CDT	Tornado Warning	EWX	Frio, Medina	38 min
Mar 19, 6:10 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Medina, Uvalde	50 min
Mar 19, 6:23 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina, Uvalde, Zavala	67 min
Mar 19, 6:33 PM CDT	Severe Thunderstorm Warning	EWX	Bandera, Kerr, Real	57 min
Mar 19, 6:45 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina	60 min
Mar 19, 6:54 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr	55 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning 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.