Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 9, NWS Houston/Galveston, TX

April 26, 2011Houston County, Trinity County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Apr 26, 2011, 11:15 PM CDT for Houston County, Trinity County, Texas. It was in force for 45 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
Apr 26, 2011, 11:15 PM CDT (04:15 UTC)
Expired
Apr 27, 2011, 12:00 AM CDT
In force
45 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon

Counties Houston County, TX, Trinity County, TX

The radar

The Shreveport radar (KSHV), 164 km from the middle of the area, began a volume at 04:18 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
Apr 26, 11:35 PM CDTTSTM WND DMGLatexo, TXTREES DOWN IN LATEXO ON 1535.

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
Apr 26, 9:42 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.3 hours before the alert went out and 172 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, Shreveport, LA at 00:00Z on 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2270 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, Shreveport, LA at 00:00Z on 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 281 square meters per square second.1939587897117Sfc1 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
2270 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
281 m²/s²
0-3 km storm-relative helicity
428 m²/s²
Significant tornado parameter
5.6
Supercell composite
23.5

Open this sounding in Storm Lab

The text

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

305 
WFUS54 KHGX 270415
TORHGX
TXC225-455-270500-
/O.NEW.KHGX.TO.W.0009.110427T0415Z-110427T0500Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1115 PM CDT TUE APR 26 2011

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN HOUSTON COUNTY IN SOUTHEAST TEXAS...
  NORTHEASTERN TRINITY COUNTY IN SOUTHEAST TEXAS...

* UNTIL MIDNIGHT CDT

* AT 1110 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS TORNADO
  WAS LOCATED NEAR KENNARD... MOVING EAST AT 40 MPH.

* LOCATIONS IN THE TORNADO WARNING INCLUDE BUT ARE NOT LIMITED TO
  WECHES...PENNINGTON...APPLE SPRINGS...LATEXO...GRAPELAND AND
  CROCKETT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES AT NIGHT ARE ESPECIALLY DANGEROUS. DO NOT WAIT UNTIL YOU
SEE OR HEAR A TORNADO - TAKE COVER NOW!

A TORNADO WATCH IS IN EFFECT UNTIL 5 AM CDT WEDNESDAY FOR THE WARNED 
AREA.

&&

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY AND ASK THEM TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE.

LAT...LON 3158 9514 3152 9509 3148 9510 3145 9501
      3140 9495 3135 9495 3133 9490 3129 9488
      3126 9488 3124 9485 3117 9482 3120 9549
      3157 9549 3159 9525
TIME...MOT...LOC 0415Z 275DEG 35KT 3136 9505

$$
1 follow-up statement
338 
WWUS54 KHGX 270443
SVSHGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1143 PM CDT TUE APR 26 2011

TXC225-455-270500-
/O.CON.KHGX.TO.W.0009.000000T0000Z-110427T0500Z/
HOUSTON TX-TRINITY TX-
1143 PM CDT TUE APR 26 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR TRINITY
AND HOUSTON COUNTIES...

AT 1139 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A TORNADO.  THIS DEVELOPING TORNADO IS FROM A NEW STORM 
LOCATED NEAR CROCKETT...MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WECHES...KENNARD AND APPLE SPRINGS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES AT NIGHT ARE ESPECIALLY DANGEROUS. DO NOT WAIT UNTIL YOU
SEE OR HEAR A TORNADO - TAKE COVER NOW!

A TORNADO WATCH IS IN EFFECT UNTIL 5 AM CDT WEDNESDAY FOR THE WARNED 
AREA.

&&

LAT...LON 3158 9514 3152 9509 3148 9510 3145 9501
      3140 9495 3135 9495 3133 9490 3129 9488
      3126 9488 3124 9485 3117 9482 3120 9549
      3157 9549 3159 9525
TIME...MOT...LOC 0442Z 271DEG 49KT 3133 9537

$$

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 10:03 PM CDTTornado WarningHGXHouston42 min
Apr 26, 10:43 PM CDTTornado WarningHGXHouston47 min
Apr 26, 11:28 PM CDTTornado WarningHGXHouston, Madison, Trinity, Walker47 min
Apr 26, 11:55 PM CDTTornado WarningHGXHouston, Polk, Trinity50 min
Apr 27, 12:07 AM CDTTornado WarningHGXHouston, Trinity38 min
Apr 27, 12:32 AM CDTTornado WarningHGXHouston, Trinity43 min
Apr 27, 12:55 AM CDTTornado WarningHGXPolk35 min
Apr 27, 4:22 AM CDTRed Flag WarningHGXAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more16 hr

Nearby

Tornado Warnings in Texas, 2011Every tornado warning in 2011Tornadoes in 2011

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.