Alert archive / Texas / Tornado Warnings in 2012

Tornado Warning 32, NWS Houston/Galveston, TX

May 11, 2012Fort Bend County, Harris County, Texas

NWS Houston/Galveston, TX issued this tornado warning at May 11, 2012, 7:07 PM CDT for Fort Bend County, Harris County, Texas. It was in force for 23 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 11, 2012, 7:07 PM CDT (00:07 UTC)
Expired: May 11, 2012, 7:30 PM CDT
In force: 23 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Fort Bend County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 74 km from the middle of the area, began a volume at 00:06 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.1 hours before the alert went out and 252 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: 21 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

757 
WFUS54 KHGX 120007
TORHGX

TXC157-201-120030-
/O.NEW.KHGX.TO.W.0032.120512T0007Z-120512T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
707 PM CDT FRI MAY 11 2012

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY  HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME NORTH CENTRAL FORT BEND COUNTY IN  TEXAS...
  EXTREME SOUTHWESTERN HARRIS COUNTY IN  TEXAS...

* UNTIL 730 PM CDT

* AT 700 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A WALL CLOUD 
  NEAR FULSHEAR. A TORNADO MAY DEVELOP AT ANY TIME. DOPPLER RADAR 
  SHOWED THIS DANGEROUS STORM MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FULSHEAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE 
LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE 
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND 
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2982 9567 2963 9567 2970 9594 2974 9594
TIME...MOT...LOC 0000Z 271DEG 13KT 2973 9592 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:30 PM CDT	Tornado Warning	HGX	Fort Bend, Harris	30 min
May 11, 8:00 PM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris, Waller	45 min
May 11, 8:08 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto, Trinity, Walker	52 min
May 11, 8:29 PM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris	46 min
May 11, 9:03 PM CDT	Severe Thunderstorm Warning	HGX	Houston	46 min
May 11, 9:26 PM CDT	Special Weather Statement	HGX	Fort Bend	49 min
May 11, 9:37 PM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris, Waller	38 min
May 11, 10:14 PM CDT	Severe Thunderstorm Warning	HGX	Fort Bend, Harris	46 min
May 11, 10:40 PM CDT	Special Weather Statement	HGX	Madison	50 min
May 11, 10:57 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Fort Bend, Harris	48 min
May 11, 11:06 PM CDT	Special Marine Warning	HGX		54 min
May 11, 11:08 PM CDT	Special Weather Statement	HGX	Chambers	52 min
May 11, 11:29 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston, Harris	61 min
May 11, 11:36 PM CDT	Special Weather Statement	HGX	Trinity	39 min
May 11, 11:41 PM CDT	Special Weather Statement	HGX	Galveston	49 min
May 12, 12:08 AM CDT	Special Marine Warning	HGX		67 min
May 12, 12:29 AM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston	31 min
May 12, 12:47 AM CDT	Special Weather Statement	HGX	Polk	43 min
May 12, 1:16 AM CDT	Special Weather Statement	HGX	Harris	44 min
May 12, 1:38 AM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris	3 hr
May 12, 2:10 AM CDT	Special Marine Warning	HGX		65 min
May 12, 2:57 AM CDT	Flash Flood Warning	HGX	Fort Bend, Harris	6 hr
May 12, 3:15 AM CDT	Areal Flood Advisory	HGX	Brazoria, Chambers, Fort Bend, Galveston, Harris	3 hr
May 12, 5:26 AM CDT	Flash Flood Warning	HGX	Brazoria, Fort Bend, Galveston, Harris	3 hr
May 12, 6:32 AM CDT	Special Marine Warning	HGX		28 min
May 12, 6:57 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
May 12, 6:57 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
May 12, 6:57 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
May 12, 6:57 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
May 12, 6:59 AM CDT	Special Marine Warning	HGX		91 min
May 12, 7:15 AM CDT	Areal Flood Advisory	HGX	Fort Bend, Harris	2 hr
May 12, 9:22 AM CDT	Areal Flood Advisory	HGX	Fort Bend	53 min

Nearby

Tornado Warnings in Texas, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.