Alert archive / Texas / Tornado Warnings in 2010

Tornado Warning 3, NWS Austin/San Antonio, TX

May 15, 2010Llano County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at May 15, 2010, 6:20 PM CDT for Llano County, Texas. It was in force for 25 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
May 15, 2010, 6:20 PM CDT (23:20 UTC)
Expired
May 15, 2010, 6:45 PM CDT
In force
25 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon

County Llano County, TX

The radar

The Austin/San Antonio radar (KEWX), 138 km from the middle of the area, began a volume at 23:23 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 nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.3 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-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 2010-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 584 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 2010-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.1939Sfc1 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
584 J/kg
Mixed-layer CIN
-226 J/kg
Mixed-layer LCL
529 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
360 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.7

Open this sounding in Storm Lab

The text

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

119 
WFUS54 KEWX 152320
TOREWX
TXC299-152345-
/O.NEW.KEWX.TO.W.0003.100515T2320Z-100515T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
620 PM CDT SAT MAY 15 2010

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  WEST CENTRAL LLANO COUNTY...

* UNTIL 645 PM CDT.

* AT 619 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR CASTELL...OR ABOUT
  17 MILES WEST OF LLANO...MOVING EAST AT 20 MPH.

* THE TORNADO WILL OTHERWISE IMPACT MAINLY RURAL AREAS OF THE
  INDICATED COUNTY.

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.

&&

LAT...LON 3078 9877 3059 9877 3062 9897 3075 9897
      3076 9897
TIME...MOT...LOC 2320Z 272DEG 18KT 3070 9895

$$
2 follow-up statements
590 
WWUS54 KEWX 152335
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
635 PM CDT SAT MAY 15 2010

TXC299-152345-
/O.CON.KEWX.TO.W.0003.000000T0000Z-100515T2345Z/
LLANO TX-
635 PM CDT SAT MAY 15 2010

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR WEST
CENTRAL LLANO COUNTY...

AT 632 PM CDT...THE PUBLIC REPORTED A FUNNEL CLOUD WITH A SEVERE 
THUNDERSTORM THAT WAS LOCATED NEAR CASTELL...OR 13 MILES WEST OF 
LLANO...MOVING EAST AT 25 MPH.

A TORNADO MAY FORM AT ANY TIME.  

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.

&&

LAT...LON 3078 9877 3059 9877 3062 9897 3075 9897
      3076 9897
TIME...MOT...LOC 2335Z 274DEG 22KT 3073 9886

$$
867 
WWUS54 KEWX 152346
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
646 PM CDT SAT MAY 15 2010

TXC299-152355-
/O.EXP.KEWX.TO.W.0003.000000T0000Z-100515T2345Z/
LLANO TX-
646 PM CDT SAT MAY 15 2010

...THE TORNADO WARNING FOR WEST CENTRAL LLANO COUNTY HAS EXPIRED...

AT 645...THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE AS ROTATION 
HAS WEAKENED.  THIS STORM CONTINUES TO MOVE EAST TOWARD LLANO WITH 
QUARTER SIZE HAIL POSSIBLE.

LAT...LON 3078 9877 3059 9877 3062 9897 3075 9897
      3076 9897
TIME...MOT...LOC 2335Z 274DEG 22KT 3073 9886

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 14, 9:36 PM CDTRiver Flood WarningEWXFrio3 days
May 14, 11:22 PM CDTRiver Flood WarningEWXBexar3 hr
May 15, 12:15 AM CDTSevere Thunderstorm WarningEWXEdwards45 min
May 15, 1:09 AM CDTFlash Flood WatchEWXAtascosa, Bandera, Bexar, Blanco, Comal, Frio and 10 more5 hr
May 15, 1:43 AM CDTAreal Flood AdvisoryEWXBandera, Bastrop, Bexar, Blanco, Caldwell, Comal and 10 more107 min
May 15, 1:54 AM CDTSevere Thunderstorm WarningEWXKinney, Uvalde51 min
May 15, 2:22 AM CDTFlash Flood WarningEWXBastrop, Bexar, Caldwell, Comal, Guadalupe, Hays and 1 more3 hr
May 15, 3:20 AM CDTFlash Flood WarningEWXBandera, Frio, Medina3 hr
May 15, 3:30 AM CDTFlash Flood WarningEWXAtascosa, Fayette, Gonzales, Wilson3 hr
May 15, 4:55 AM CDTAreal Flood AdvisoryEWXDeWitt, Karnes, Lavaca2 hr
May 15, 9:48 AM CDTRiver Flood WarningEWXBexar24 hr
May 15, 6:06 PM CDTSevere Thunderstorm WarningEWXLlano39 min
May 15, 6:43 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano20 min

Nearby

Tornado Warnings in Texas, 2010Every tornado warning in 2010Tornadoes in 2010

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.