Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 13, NWS Houston/Galveston, TX

April 4, 2011Houston County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 4, 2011, 9:08 AM CDT for Houston County, Texas. It was in force for 52 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 4, 2011, 9:08 AM CDT (14:08 UTC)
Expired: Apr 4, 2011, 10:00 AM CDT
In force: 52 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

County Houston County, TX

The radar

The Shreveport radar (KSHV), 186 km from the middle of the area, began a volume at 14:11 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 4, 9:35 AM CDT	TSTM WND GST 55	Crockett, TX	AWOS KDRK MEASURED 48 KNOT WIND GUST.

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 4, 7:44 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 2.1 hours before the alert went out and 195 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: 1653 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

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

481 
WUUS54 KHGX 041408
SVRHGX
TXC225-041500-
/O.NEW.KHGX.SV.W.0013.110404T1408Z-110404T1500Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
908 AM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HOUSTON COUNTY IN SOUTHEAST TEXAS...

* UNTIL 1000 AM CDT

* AT 903 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 15
  MILES NORTHWEST OF AUSTONIO...AND MOVING EAST AT 40 MPH.

* LOCATIONS IN THE SEVERE THUNDERSTORM WARNING INCLUDE BUT ARE NOT
  LIMITED TO GRAPELAND AND CROCKETT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STRONG WINDS MAY KNOCK DOWN TREES AND POWER LINES OR DAMAGE
BUILDINGS. TAKE COVER NOW!

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 3 PM CDT 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 9524 3159 9518 3153 9510 3148 9510
      3145 9501 3141 9497 3103 9552 3120 9575
      3127 9573 3133 9566 3146 9572 3147 9575
      3151 9574 3157 9556 3160 9529
TIME...MOT...LOC 1408Z 261DEG 45KT 3136 9573

$$

3 follow-up statements

517 
WWUS54 KHGX 041431
SVSHGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
931 AM CDT MON APR 4 2011

TXC225-041500-
/O.CON.KHGX.SV.W.0013.000000T0000Z-110404T1500Z/
HOUSTON TX-
931 AM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR HOUSTON COUNTY...

AT 926 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR LATEXO...OR NEAR CROCKETT...MOVING EAST AT 40 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM CDT MONDAY
AFTERNOON FOR SOUTHEAST TEXAS.

&&

LAT...LON 3158 9524 3159 9518 3153 9510 3148 9510
      3145 9501 3141 9497 3103 9552 3120 9575
      3127 9573 3133 9566 3146 9572 3147 9575
      3151 9574 3157 9556 3160 9529
TIME...MOT...LOC 1429Z 258DEG 44KT 3140 9539

$$

623 
WWUS54 KHGX 041449
SVSHGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
949 AM CDT MON APR 4 2011

TXC225-041500-
/O.CON.KHGX.SV.W.0013.000000T0000Z-110404T1500Z/
HOUSTON TX-
949 AM CDT MON APR 4 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR HOUSTON COUNTY...

AT 945 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES NORTH OF KENNARD...
OR 19 MILES NORTHEAST OF CROCKETT...MOVING EAST AT 40 MPH. THESE 
STORMS HAVE A HISTORY OF PRODUCING 55 MPH WIND GUSTS AS THEY PASSED 
OVER CROCKETT AT 935 AM CDT.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM CDT MONDAY
AFTERNOON FOR SOUTHEAST TEXAS.

&&

LAT...LON 3158 9524 3159 9518 3153 9510 3148 9510
      3145 9501 3141 9497 3103 9552 3120 9575
      3127 9573 3133 9566 3146 9572 3147 9575
      3151 9574 3157 9556 3160 9529
TIME...MOT...LOC 1448Z 258DEG 43KT 3145 9513

$$

810 
WWUS54 KHGX 041503
SVSHGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1003 AM CDT MON APR 4 2011

TXC225-041512-
/O.EXP.KHGX.SV.W.0013.000000T0000Z-110404T1500Z/
HOUSTON TX-
1003 AM CDT MON APR 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR HOUSTON COUNTY HAS EXPIRED...

THE LINE OF STRONG STORMS HAS WEAKENED AND IS MOVING EAST OF THE 
COUNTY AT 30 MPH. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT 
UNTIL 300 PM CDT MONDAY AFTERNOON FOR SOUTHEAST TEXAS.

LAT...LON 3158 9524 3159 9518 3153 9510 3148 9510
      3145 9501 3141 9497 3103 9552 3120 9575
      3127 9573 3133 9566 3146 9572 3147 9575
      3151 9574 3157 9556 3160 9529
TIME...MOT...LOC 1449Z 258DEG 43KT 3145 9512

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 9:51 PM CDT	Fire Weather Watch	HGX	Austin, Brazos, Burleson, Colorado, Fort Bend, Grimes and 10 more	14 hr
Apr 3, 10:17 PM CDT	Wind Advisory	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	23 hr
Apr 4, 8:12 AM CDT	Special Weather Statement	HGX	Brazos, Burleson, Houston, Madison, Washington	63 min
Apr 4, 9:37 AM CDT	Special Weather Statement	HGX	Madison	23 min
Apr 4, 10:09 AM CDT	Special Weather Statement	HGX	Angelina	51 min
Apr 4, 10:21 AM CDT	Special Weather Statement	HGX	Trinity, Walker	24 min
Apr 4, 10:40 AM CDT	Special Weather Statement	HGX	San Jacinto	35 min
Apr 4, 10:52 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Grimes, Harris, Montgomery, Walker, Waller and 1 more	16 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.