Alert archive / Texas / Tornado Warnings in 2009

Tornado Warning 8, NWS Austin/San Antonio, TX

April 27, 2009Williamson County, Texas

NWS Austin/San Antonio, TX issued this tornado warning at Apr 27, 2009, 4:48 AM CDT for Williamson County, Texas. It was in force for 27 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 27, 2009, 4:48 AM CDT (09:48 UTC)
Expired: Apr 27, 2009, 5:15 AM CDT
In force: 27 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 5 km from the middle of the area, began a volume at 09:48 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

Fort Worth, TX (KFWD), launched 00:00Z, 9.8 hours before the alert went out and 230 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: 479 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 360 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KEWX 270948
TOREWX
TXC491-271015-
/O.NEW.KEWX.TO.W.0008.090427T0948Z-090427T1015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
448 AM CDT MON APR 27 2009

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL WILLIAMSON COUNTY...

* UNTIL 515 AM CDT.

* AT 446 AM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GRANGER...MOVING
  NORTHEAST AT 20 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE BARTLETT AND GRANGER DAM.

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 3081 9743 3081 9742 3075 9727 3074 9726
      3072 9726 3065 9745 3072 9755 3082 9749
      3083 9746
TIME...MOT...LOC 0948Z 230DEG 16KT 3071 9746

$$

3 follow-up statements

000 
WWUS54 KEWX 270955
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
455 AM CDT MON APR 27 2009

TXC491-271015-
/O.CON.KEWX.TO.W.0008.000000T0000Z-090427T1015Z/
WILLIAMSON TX-
455 AM CDT MON APR 27 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 AM CDT FOR CENTRAL
WILLIAMSON COUNTY...

AT 453 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED NEAR GRANGER...MOVING NORTHEAST AT 15 MPH.

SOME LOCATIONS IN THE WARNING AREA INCLUDE BARTLETT.

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.

&&

LAT...LON 3081 9743 3081 9742 3075 9727 3074 9726
      3072 9726 3065 9745 3072 9755 3082 9749
      3083 9746
TIME...MOT...LOC 0955Z 217DEG 14KT 3076 9743

$$

000 
WWUS54 KEWX 271001
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
501 AM CDT MON APR 27 2009

TXC491-271015-
/O.CON.KEWX.TO.W.0008.000000T0000Z-090427T1015Z/
WILLIAMSON TX-
501 AM CDT MON APR 27 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 AM CDT FOR NORTH
CENTRAL WILLIAMSON COUNTY...

AT 500 AM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A TORNADO. 
THIS TORNADO WAS LOCATED NEAR BARTLETT...OR NEAR GRANGER...MOVING
NORTHEAST AT 15 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

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.

&&

LAT...LON 3073 9742 3075 9746 3081 9745 3081 9742
      3078 9734
TIME...MOT...LOC 1001Z 214DEG 15KT 3079 9741

$$

000 
WWUS54 KEWX 271012
SVSEWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
512 AM CDT MON APR 27 2009

TXC491-271020-
/O.EXP.KEWX.TO.W.0008.000000T0000Z-090427T1015Z/
WILLIAMSON TX-
512 AM CDT MON APR 27 2009

...THE TORNADO WARNING FOR NORTHEASTERN WILLIAMSON COUNTY WILL BE 
ALLOWED TO EXPIRE AT 515 AM CDT...

THE SEVERE THUNDERSTORM THAT INDICATED A TORNADO HAS MOVED NORTHEAST 
OUT OF WILLIAMSON COUNTY.  

LAT...LON 3073 9742 3075 9746 3081 9745 3081 9742
      3078 9734
TIME...MOT...LOC 1010Z 214DEG 15KT 3082 9739

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 9:42 PM CDT	Tornado Warning	EWX	Edwards	33 min
Apr 26, 10:13 PM CDT	Tornado Warning	EWX	Edwards, Kerr	32 min
Apr 26, 10:42 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Kerr	48 min
Apr 27, 12:11 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie	49 min
Apr 27, 3:20 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	115 min
Apr 27, 4:28 AM CDT	Tornado Warning	EWX	Williamson	32 min
Apr 27, 7:11 AM CDT	Flood Watch	EWX	Blanco, Burnet, Gillespie, Hays, Kendall, Kerr and 3 more	8 min
Apr 27, 7:19 AM CDT	Flash Flood Watch	EWX	Blanco, Burnet, DeWitt, Fayette, Gillespie, Gonzales and 8 more	11 hr
Apr 27, 9:14 AM CDT	Areal Flood Advisory	EWX	Burnet, Gillespie, Llano	2 hr
Apr 27, 9:53 AM CDT	Areal Flood Advisory	EWX	Edwards, Val Verde	112 min
Apr 27, 11:00 AM CDT	Flash Flood Warning	EWX	Val Verde	39 min
Apr 27, 11:22 AM CDT	Areal Flood Advisory	EWX	Bandera, Blanco, Burnet, Gillespie, Kendall, Kerr and 2 more	113 min
Apr 27, 11:30 AM CDT	Areal Flood Advisory	EWX	Edwards	2 hr
Apr 27, 11:46 AM CDT	Areal Flood Advisory	EWX	Kinney, Uvalde, Val Verde	119 min
Apr 27, 11:58 AM CDT	Areal Flood Advisory	EWX	Bastrop, Bexar, Caldwell, Comal, Guadalupe, Hays and 5 more	2 hr
Apr 27, 12:30 PM CDT	Areal Flood Advisory	EWX	DeWitt, Fayette, Gonzales, Karnes, Lavaca	2 hr
Apr 27, 12:53 PM CDT	Areal Flood Advisory	EWX	Bandera, Blanco, Burnet, Gillespie, Kendall, Kerr and 2 more	3 hr
Apr 27, 1:01 PM CDT	River Flood Warning	EWX	Val Verde	7 hr
Apr 27, 1:07 PM CDT	Flash Flood Warning	EWX	Hays, Travis, Williamson	2 hr
Apr 27, 1:14 PM CDT	Flash Flood Warning	EWX	Bandera, Gillespie, Kendall, Kerr	116 min
Apr 27, 1:34 PM CDT	Flash Flood Warning	EWX	Caldwell, Gonzales, Guadalupe, Wilson	3 hr
Apr 27, 1:53 PM CDT	Flash Flood Warning	EWX	Blanco, Comal	95 min
Apr 27, 1:54 PM CDT	Severe Thunderstorm Warning	EWX	Gonzales, Guadalupe, Wilson	66 min
Apr 27, 2:08 PM CDT	Flash Flood Warning	EWX	Bexar	84 min
Apr 27, 2:26 PM CDT	Flash Flood Warning	EWX	Fayette	3 hr
Apr 27, 2:30 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Gonzales, Guadalupe, Wilson	60 min
Apr 27, 2:44 PM CDT	Areal Flood Advisory	EWX	DeWitt, Karnes, Lavaca	2 hr
Apr 27, 3:16 PM CDT	Flash Flood Warning	EWX	DeWitt, Karnes, Lavaca	3 hr
Apr 27, 3:28 PM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Karnes	62 min
Apr 27, 3:40 PM CDT	Tornado Warning	EWX	DeWitt, Gonzales, Karnes	50 min
Apr 27, 4:04 PM CDT	Tornado Warning	EWX	DeWitt	26 min
Apr 27, 4:06 PM CDT	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales, Lavaca	39 min
Apr 27, 4:23 PM CDT	Tornado Warning	EWX	DeWitt, Lavaca	52 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.