Alert archive / Texas / Tornado Warnings in 2011
Tornado Warning 11, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at Apr 26, 2011, 11:55 PM CDT for Houston County, Polk County, Trinity County, Texas. It was in force for 50 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, 11:55 PM CDT (04:55 UTC)
- Expired
- Apr 27, 2011, 12:45 AM CDT
- In force
- 50 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Houston County, TX, Polk County, TX, Trinity County, TX
The radar
The Shreveport radar (KSHV), 171 km from the middle of the area, began a volume at 04:58 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 27, 12:15 AM CDT | HAIL 1.75 | Groveton, TX | HAIL FELL IN GROVETON REPORTED BY THE PUBLIC TO DISPATCH. |
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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 26, 9:42 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 4.9 hours before the alert went out and 179 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
811
WFUS54 KHGX 270455
TORHGX
TXC225-373-455-270545-
/O.NEW.KHGX.TO.W.0011.110427T0455Z-110427T0545Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1155 PM CDT TUE APR 26 2011
THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN HOUSTON COUNTY IN SOUTHEAST TEXAS...
NORTHERN POLK COUNTY IN SOUTHEAST TEXAS...
TRINITY COUNTY IN SOUTHEAST TEXAS...
* UNTIL 1245 AM CDT
* AT 1152 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS TORNADO
WAS LOCATED NEAR LOVELADY... MOVING EAST AT 50 MPH.
* LOCATIONS IN THE TORNADO WARNING INCLUDE BUT ARE NOT LIMITED TO
PENNINGTON...APPLE SPRINGS...LATEXO...KENNARD...GROVETON...CROCKETT
AND CORRIGAN.
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 3135 9495 3135 9492 3129 9488 3126 9488
3121 9484 3117 9482 3115 9482 3112 9478
3109 9465 3094 9466 3101 9544 3140 9549
3140 9496
TIME...MOT...LOC 0454Z 274DEG 50KT 3111 9532
$$1 follow-up statement
493
WWUS54 KHGX 270527
SVSHGX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1227 AM CDT WED APR 27 2011
TXC225-373-455-270545-
/O.CON.KHGX.TO.W.0011.000000T0000Z-110427T0545Z/
HOUSTON TX-TRINITY TX-POLK TX-
1227 AM CDT WED APR 27 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT FOR POLK...
TRINITY AND HOUSTON COUNTIES...
AT 1222 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO. THIS TORNADO WAS LOCATED 7 MILES NORTHWEST OF
CORRIGAN...OR 11 MILES SOUTHWEST OF DIBOLL...MOVING EAST AT 55 MPH.
THE PATH OF THIS STORM WILL COME ACROSS CORRIGAN AND THE AREA NORTH
OF CORRIGAN IN POLK COUNTY AND EXTREME EASTERN TRINITY COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM MAY PRODUCE LARGE DAMAGING HAIL...RESULTING IN EXTENSIVE
PROPERTY DAMAGE OR SERIOUS INJURY. AVOID WINDOWS AND TAKE COVER NOW!
HAIL UP TO GOLFBALL HAIL HAS BEEN REPORTED IN GROVETON WITH THIS
STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION
TO PROTECT LIFE AND PROPERTY.
TORNADOES AT NIGHT ARE ESPECIALLY DANGEROUS. DO NOT WAIT UNTIL YOU
SEE OR HEAR A TORNADO - TAKE COVER NOW!
&&
LAT...LON 3135 9495 3135 9492 3129 9488 3126 9488
3121 9484 3117 9482 3115 9482 3112 9478
3109 9465 3094 9466 3101 9544 3140 9549
3140 9496
TIME...MOT...LOC 0525Z 276DEG 46KT 3107 9486
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 10:03 PM CDT | Tornado Warning | HGX | Houston | 42 min |
| Apr 26, 10:43 PM CDT | Tornado Warning | HGX | Houston | 47 min |
| Apr 26, 11:15 PM CDT | Tornado Warning | HGX | Houston, Trinity | 45 min |
| Apr 26, 11:28 PM CDT | Tornado Warning | HGX | Houston, Madison, Trinity, Walker | 47 min |
| Apr 27, 12:07 AM CDT | Tornado Warning | HGX | Houston, Trinity | 38 min |
| Apr 27, 12:32 AM CDT | Tornado Warning | HGX | Houston, Trinity | 43 min |
| Apr 27, 12:55 AM CDT | Tornado Warning | HGX | Polk | 35 min |
| Apr 27, 4:22 AM CDT | Red Flag Warning | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 16 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.