Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 106, NWS Houston/Galveston, TX

September 29, 2011Austin County, Colorado County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Sep 29, 2011, 2:53 PM CDT for Austin County, Colorado County, Texas. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 29, 2011, 2:53 PM CDT (19:53 UTC)
Expired
Sep 29, 2011, 3:30 PM CDT
In force
37 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon

Counties Austin County, TX, Colorado County, TX

The radar

The Houston radar (KHGX), 132 km from the middle of the area, began a volume at 19:54 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

Corpus Christi, TX (KCRP), launched 12:00Z, 7.9 hours before the alert went out and 243 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, Corpus Christi, TX at 12:00Z on 2011-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3536 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 12:00Z on 2011-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -50 square meters per square second.193958Sfc1 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
3536 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
602 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-50 m²/s²
0-3 km storm-relative helicity
-44 m²/s²
Significant tornado parameter
-0.5
Supercell composite
-3.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 29, 12:39 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Sep 29, 12:39 PM CDT, 2 hours 14 minutes before
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Hazardous weather outlook, Sep 29, 7:35 AM CDT, 7 hours 18 minutes before
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In the hours before

Special weather statement, Sep 29, 2:35 PM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
235 PM CDT THU SEP 29 2011

TXZ210-211-292015-
AUSTIN-COLORADO-
235 PM CDT THU SEP 29 2011

...SIGNIFICANT WEATHER ADVISORY...

AT 231 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NORTHEASTERN FAYETTE
COUNTY TO WEST CENTRAL AUSTIN COUNTY...MOVING SOUTHEAST AT 10 MPH.

WINDS GREATER THAN 40 MPH...OCCASIONAL CLOUD TO GROUND LIGHTNING...
AND BRIEF MODERATE DOWNPOURS ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...SHELBY...NEW ULM...
INDUSTRY AND FRELSBURG.

GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. IF YOU ARE OUTDOORS AND HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING. SEEK SHELTER IN A STURDY STRUCTURE
OR NON-CONVERTIBLE AUTOMOBILE UNTIL THESE STORMS HAVE PASSED.

LAT...LON 2996 9658 3002 9662 3004 9662 2994 9638
      2962 9623 2980 9673
TIME...MOT...LOC 1935Z 334DEG 10KT 3001 9669 2992 9648

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 29, 5:13 AM CDTSevere Thunderstorm WarningHGXChambers, Galveston47 min
Sep 29, 5:15 AM CDTSpecial Marine WarningHGX60 min
Sep 29, 5:28 AM CDTSpecial Marine WarningHGX2 hr
Sep 29, 6:08 AM CDTSpecial Marine WarningHGX97 min
Sep 29, 7:34 AM CDTSpecial Marine WarningHGX116 min
Sep 29, 2:35 PM CDTSpecial Weather StatementHGXAustin40 min
Sep 29, 2:57 PM CDTSpecial Weather StatementHGXSan Jacinto63 min
Sep 29, 3:25 PM CDTSevere Thunderstorm WarningHGXMontgomery, San Jacinto65 min
Sep 29, 3:31 PM CDTSpecial Weather StatementHGXHarris59 min
Sep 29, 3:34 PM CDTSpecial Weather StatementHGXColorado56 min
Sep 29, 3:47 PM CDTSpecial Weather StatementHGXMontgomery58 min
Sep 29, 3:53 PM CDTSevere Thunderstorm WarningHGXLiberty52 min
Sep 29, 3:56 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris49 min
Sep 29, 4:11 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery49 min
Sep 29, 4:23 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery, Waller37 min
Sep 29, 4:32 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris28 min
Sep 29, 4:38 PM CDTSevere Thunderstorm WarningHGXAustin, Grimes, Harris, Waller, Washington52 min
Sep 29, 4:41 PM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty49 min
Sep 29, 4:42 PM CDTSpecial Marine WarningHGX93 min
Sep 29, 5:00 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris45 min
Sep 29, 5:03 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris, Montgomery, Waller42 min
Sep 29, 5:28 PM CDTSevere Thunderstorm WarningHGXChambers, Galveston, Harris, Liberty27 min
Sep 29, 5:34 PM CDTSpecial Weather StatementHGXAustin41 min
Sep 29, 5:41 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Fort Bend, Harris, Waller, Wharton40 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.