Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Houston/Galveston, TX

May 11, 2021Polk County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 11, 2021, 7:25 AM CDT for Polk County, Texas. It was in force for 35 min. 3 reports 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
May 11, 2021, 7:25 AM CDT (12:25 UTC)
Expired
May 11, 2021, 8:00 AM CDT
In force
35 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Polk County, TX

The radar

The Houston radar (KHGX), 134 km from the middle of the area, began a volume at 12:07 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
May 11, 7:25 AM CDTTSTM WND DMG13 Ese Livingston, TXDOZENS OF TREES DOWN AROUND WILSON LAKE AND ALONG CAMP RUBY ROAD WITH SOME ON HOMES, TRAILERS. MANY LARGE TREES UPROOTED. ESTIMATED 70 MPH WINDS. MOST TREES DOWNED TOWARD THE SE.
May 11, 7:30 AM CDTTSTM WND DMG13 Ese Livingston, TXDOWNED TREES OVER ROADWAYS AND ON HOMES IN WILSON LAKE ESTATES. RESIDENTS ALSO REPORTED SEEING QUARTER SIZE HAIL DURING THE STORM. APPROXIMATELY 10-15 HOMES WERE IMPACTED AND SUSTAINED DAMAGE.
May 11, 7:30 AM CDTHAIL 113 Ese Livingston, TXHAIL IN WILSON LAKE ESTATES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.4 hours before the alert went out and 161 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, Lake Charles Mun, LA at 12:00Z on 2021-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2925 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, Lake Charles Mun, LA at 12:00Z on 2021-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
2925 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
472 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
1.8
Supercell composite
11.9

Open this sounding in Storm Lab

The text

As transmitted.

379 
WUUS54 KHGX 111225
SVRHGX
TXC373-111300-
/O.NEW.KHGX.SV.W.0040.210511T1225Z-210511T1300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
725 AM CDT Tue May 11 2021

The National Weather Service in League City has issued a

* Severe Thunderstorm Warning for...
  Southeastern Polk County in southeastern Texas...

* Until 800 AM CDT.

* At 724 AM CDT, a severe thunderstorm was located over
  Alabama-Coushatta Reservation, or 13 miles east of Livingston,
  moving east at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Alabama-Coushatta Reservation and Segno. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3057 9487 3070 9488 3084 9462 3056 9455
TIME...MOT...LOC 1224Z 250DEG 16KT 3071 9471 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
4 follow-up statements
880 
WWUS54 KHGX 111231
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
731 AM CDT Tue May 11 2021

TXC373-111300-
/O.CON.KHGX.SV.W.0040.000000T0000Z-210511T1300Z/
Polk TX-
731 AM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR SOUTHEASTERN POLK COUNTY...

At 731 AM CDT, a severe thunderstorm was located near
Alabama-Coushatta Reservation, or 15 miles east of Livingston, moving
east at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Segno.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3057 9487 3070 9488 3073 9460 3056 9455
TIME...MOT...LOC 1231Z 287DEG 15KT 3065 9468 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
754 
WWUS54 KHGX 111242
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
742 AM CDT Tue May 11 2021

TXC373-111300-
/O.CON.KHGX.SV.W.0040.000000T0000Z-210511T1300Z/
Polk TX-
742 AM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR SOUTHEASTERN POLK COUNTY...

At 742 AM CDT, a severe thunderstorm was located 7 miles southeast of
Alabama-Coushatta Reservation, or 13 miles west of Warren, moving
east at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Segno.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3057 9487 3070 9488 3073 9460 3056 9455
TIME...MOT...LOC 1242Z 287DEG 15KT 3063 9463 

HAIL...1.00IN
WIND...60MPH
 
$$
976 
WWUS54 KHGX 111251
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
751 AM CDT Tue May 11 2021

TXC373-111300-
/O.CON.KHGX.SV.W.0040.000000T0000Z-210511T1300Z/
Polk TX-
751 AM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR SOUTHEASTERN POLK COUNTY...

At 751 AM CDT, a severe thunderstorm was located 9 miles northwest of
Wildwood, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Segno.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3057 9487 3071 9479 3071 9459 3056 9455
TIME...MOT...LOC 1251Z 295DEG 16KT 3060 9457 

HAIL...1.00IN
WIND...60MPH
 
$$
515 
WWUS54 KHGX 111255
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
755 AM CDT Tue May 11 2021

TXC373-111305-
/O.EXP.KHGX.SV.W.0040.000000T0000Z-210511T1300Z/
Polk TX-
755 AM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN POLK COUNTY WILL
EXPIRE AT 800 AM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 3057 9487 3071 9479 3071 9459 3056 9455
TIME...MOT...LOC 1255Z 250DEG 16KT 3061 9455 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 3:27 AM CDTFlash Flood WatchHGXBrazos, Grimes, Houston, Madison, Montgomery, Polk and 3 more24 hr
May 11, 6:28 AM CDTAreal Flood AdvisoryHGXPolk3 hr
May 11, 6:46 AM CDTSpecial Weather StatementHGXPolk44 min
May 11, 8:34 AM CDTAreal Flood AdvisoryHGXPolk3 hr
May 11, 10:03 AM CDTSmall Craft AdvisoryHGX3 hr
May 11, 11:05 AM CDTSpecial Weather StatementHGXHouston10 min
May 11, 1:09 PM CDTSpecial Weather StatementHGXMadison36 min
May 11, 1:21 PM CDTSpecial Weather StatementHGXBrazos39 min
May 11, 1:28 PM CDTTornado WarningHGXHouston, Madison, Walker32 min
May 11, 1:57 PM CDTTornado WarningHGXHouston, Madison, Walker18 min
May 11, 2:20 PM CDTTornado Warning Tornado observedHGXHouston, Trinity, Walker25 min
May 11, 2:41 PM CDTSevere Thunderstorm WarningHGXHouston64 min
May 11, 3:09 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson52 min
May 11, 3:31 PM CDTSevere Thunderstorm WarningHGXHouston44 min
May 11, 3:53 PM CDTSevere Thunderstorm WarningHGXHouston37 min
May 11, 4:10 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes35 min
May 11, 4:14 PM CDTTornado WarningHGXHouston, Trinity31 min
May 11, 4:27 PM CDTTornado WarningHGXHouston, Trinity, Walker33 min
May 11, 4:44 PM CDTTornado WarningHGXHouston, Polk, Trinity46 min
May 11, 4:54 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto, Trinity51 min
May 11, 5:22 PM CDTSpecial Weather StatementHGXMontgomery, Waller38 min
May 11, 5:34 PM CDTAreal Flood AdvisoryHGXHouston, Madison116 min
May 11, 5:41 PM CDTSevere Thunderstorm WarningHGXLiberty, Polk, San Jacinto, Trinity64 min
May 11, 5:49 PM CDTAreal Flood AdvisoryHGXHouston, San Jacinto, Trinity, Walker116 min
May 11, 6:18 PM CDTSevere Thunderstorm WarningHGXLiberty42 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning in 2021

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.