Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 28, NWS Austin/San Antonio, TX

March 19, 2012Gillespie County, Kerr County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 19, 2012, 6:54 PM CDT for Gillespie County, Kerr County, Texas. It was in force for 55 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
Mar 19, 2012, 6:54 PM CDT (23:54 UTC)
Expired
Mar 19, 2012, 7:49 PM CDT
In force
55 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

Counties Gillespie County, TX, Kerr County, TX

The radar

The Austin/San Antonio radar (KEWX), 136 km from the middle of the area, began a volume at 23:54 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
Mar 19, 6:54 PM CDTHAIL 14 N Mountain Home, TX
Mar 19, 7:05 PM CDTHAIL 0.7Harper, TXON GOING DIME HAIL IN THE CITY OF HARPER.
Mar 19, 7:15 PM CDTHAIL 0.753 Sw Harper, TXLOW WATER CROSSING FLOODED... SMALL TREE LIMBS DOWN... VERY HEAVY RAIN

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
Mar 19, 2:39 PM CDTTornado WatchSPC7 hr
Mar 19, 6:21 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.9 hours before the alert went out and 191 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, Del Rio, TX at 12:00Z on 2012-03-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2784 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2012-03-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 284 square meters per square second.1939587897Sfc1 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
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.

236 
WUUS54 KEWX 192354
SVREWX
TXC171-265-200100-
/O.NEW.KEWX.SV.W.0028.120319T2354Z-120320T0100Z/

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

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN GILLESPIE COUNTY...
  CENTRAL KERR COUNTY...

* UNTIL 800 PM CDT.

* AT 654 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM
  WAS LOCATED NEAR MOUNTAIN HOME...OR 18 MILES NORTHWEST OF
  KERRVILLE...AND MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE HARPER...TIVYDALE...DOSS...
  HILLTOP AND CHERRY SPRING.

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. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL
100 AM CDT TUESDAY MORNING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 3050 9898 3043 9884 2999 9930 3022 9952
      3030 9946 3030 9931 3050 9931 3051 9930
TIME...MOT...LOC 2355Z 227DEG 30KT 3023 9934

$$
1 follow-up statement
774 
WWUS54 KEWX 200049
SVSEWX

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

TXC171-265-200059-
/O.CAN.KEWX.SV.W.0028.000000T0000Z-120320T0100Z/
GILLESPIE TX-KERR TX-
749 PM CDT MON MAR 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KERR AND WESTERN
GILLESPIE COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED BELOW SEVERE LEVELS. AS A RESULT...THE 
WARNING IS CANCELLED. 

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT MONDAY EVENING
FOR SOUTH CENTRAL TEXAS. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL
100 AM CDT TUESDAY MORNING FOR SOUTH CENTRAL TEXAS.

LAT...LON 3050 9898 3043 9884 2999 9930 3022 9952
      3030 9946 3030 9931 3050 9931 3051 9930
TIME...MOT...LOC 0049Z 227DEG 30KT 3054 9896

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 19, 2:30 PM CDTSevere Thunderstorm WarningEWXVal Verde45 min
Mar 19, 3:06 PM CDTTornado WarningEWXEdwards, Val Verde39 min
Mar 19, 4:52 PM CDTSevere Thunderstorm WarningEWXEdwards53 min
Mar 19, 5:18 PM CDTTornado WarningEWXEdwards42 min
Mar 19, 5:29 PM CDTSevere Thunderstorm WarningEWXMedina, Uvalde49 min
Mar 19, 5:50 PM CDTSevere Thunderstorm WarningEWXFrio, Medina, Zavala55 min
Mar 19, 5:53 PM CDTSevere Thunderstorm WarningEWXDimmit32 min
Mar 19, 6:03 PM CDTTornado WarningEWXLlano27 min
Mar 19, 6:07 PM CDTTornado WarningEWXFrio, Medina38 min
Mar 19, 6:10 PM CDTSevere Thunderstorm WarningEWXBandera, Kerr, Medina, Uvalde50 min
Mar 19, 6:23 PM CDTSevere Thunderstorm WarningEWXFrio, Medina, Uvalde, Zavala67 min
Mar 19, 6:33 PM CDTSevere Thunderstorm WarningEWXBandera, Kerr, Real57 min
Mar 19, 6:45 PM CDTSevere Thunderstorm WarningEWXFrio, Medina60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012Every 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.