Alert archive / Texas / Tornado Warnings in 2009

Tornado Warning 4, NWS Austin/San Antonio, TX

April 17, 2009Fayette County, Lavaca County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Apr 17, 2009, 2:47 PM CDT for Fayette County, Lavaca County, Texas. It was in force for 28 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: Apr 17, 2009, 2:47 PM CDT (19:47 UTC)
Expired: Apr 17, 2009, 3:15 PM CDT
In force: 28 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Fayette County, TX, Lavaca County, TX

The radar

The Austin/San Antonio radar (KEWX), 114 km from the middle of the area, began a volume at 19:50 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 17, 12:51 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 7.8 hours before the alert went out and 195 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: 2605 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.0

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 171947
TOREWX
TXC149-285-172015-
/O.NEW.KEWX.TO.W.0004.090417T1947Z-090417T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
247 PM CDT FRI APR 17 2009

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL FAYETTE COUNTY...
  NORTHERN LAVACA COUNTY...

* UNTIL 315 PM CDT.

* AT 247 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES WEST OF
  HALLETTSVILLE...MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE SUBLIME AND SCHULENBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS ON THE LOWEST FLOOR OF A
BUILDING IN AN INTERIOR HALLWAY...BATHROOM...OR CLOSET. COVER
YOURSELF WITH BLANKETS...PILLOWS OR EVEN A MATTRESS FOR BETTER
PROTECTION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT FRIDAY
EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2935 9666 2930 9700 2946 9719 2973 9692
TIME...MOT...LOC 1947Z 226DEG 29KT 2946 9704

$$

1 follow-up statement

000 
WWUS54 KEWX 172003
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
303 PM CDT FRI APR 17 2009

TXC149-285-172015-
/O.CON.KEWX.TO.W.0004.000000T0000Z-090417T2015Z/
FAYETTE TX-LAVACA TX-
303 PM CDT FRI APR 17 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR NORTHERN
LAVACA AND SOUTH CENTRAL FAYETTE COUNTIES...

AT 301 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED NEAR BRESLAU...OR 7 MILES NORTH OF
HALLETTSVILLE...MOVING NORTHEAST AT 35 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE VSETIN...SUBLIME...
HACKBERRY...HIGH HILL AND SCHULENBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS ON THE LOWEST FLOOR OF A
BUILDING IN AN INTERIOR HALLWAY...BATHROOM...OR CLOSET. COVER
YOURSELF WITH BLANKETS...PILLOWS OR EVEN A MATTRESS FOR BETTER
PROTECTION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT FRIDAY
EVENING FOR SOUTH CENTRAL TEXAS.

&&

LAT...LON 2943 9709 2955 9710 2973 9692 2935 9666
      2930 9700
TIME...MOT...LOC 2002Z 226DEG 29KT 2955 9694

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 10:24 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Val Verde	51 min
Apr 16, 11:09 PM CDT	Severe Thunderstorm Warning	EWX	Kinney, Val Verde	36 min
Apr 17, 4:52 AM CDT	Areal Flood Advisory	EWX	Edwards, Val Verde	113 min
Apr 17, 7:03 AM CDT	Severe Thunderstorm Warning	EWX	Kinney, Maverick	57 min
Apr 17, 7:38 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	39 min
Apr 17, 7:40 AM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	35 min
Apr 17, 8:03 AM CDT	River Flood Warning	EWX	Val Verde	43 hr
Apr 17, 8:10 AM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Gillespie, Hays, Kendall, Llano and 1 more	50 min
Apr 17, 8:17 AM CDT	River Flood Warning	EWX	Val Verde	18 hr
Apr 17, 8:59 AM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Hays, Travis	46 min
Apr 17, 9:23 AM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Gillespie, Llano	3 hr
Apr 17, 9:47 AM CDT	Areal Flood Advisory	EWX	Hays, Travis, Williamson	3 hr
Apr 17, 11:18 AM CDT	Areal Flood Advisory	EWX	Fayette, Lavaca	117 min
Apr 17, 11:48 AM CDT	Severe Thunderstorm Warning	EWX	Frio	27 min
Apr 17, 1:32 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Lavaca, Lee	118 min
Apr 17, 2:25 PM CDT	Flash Flood Warning	EWX	Bastrop, Caldwell, DeWitt, Fayette, Gonzales, Lavaca and 1 more	4 hr
Apr 17, 5:10 PM CDT	Severe Thunderstorm Warning	EWX	Lee	35 min

Nearby

Tornado Warnings in Texas, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.