Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Houston/Galveston, TX

May 11, 2021Liberty County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 11, 2021, 6:18 PM CDT for Liberty County, Texas. It was in force for 42 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
May 11, 2021, 6:18 PM CDT (23:18 UTC)
Expired
May 11, 2021, 7:00 PM CDT
In force
42 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Liberty County, TX

The radar

The Houston radar (KHGX), 84 km from the middle of the area, began a volume at 23:18 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, 6:19 PM CDTTSTM WND DMGCleveland, TX15-20 TREES AND POWERLINES BLOWN DOWN.

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, 11.3 hours before the alert went out and 163 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.

843 
WUUS54 KHGX 112318
SVRHGX
TXC291-120000-
/O.NEW.KHGX.SV.W.0048.210511T2318Z-210512T0000Z/

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

The National Weather Service in League City has issued a

* Severe Thunderstorm Warning for...
  Central Liberty County in southeastern Texas...

* Until 700 PM CDT.

* At 617 PM CDT, a severe thunderstorm was located 7 miles southeast
  of Cleveland, moving east at 25 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...
  Northeastern Liberty, Cleveland, Daisetta, Hardin, Plum Grove,
  Kenefick, Dayton Lakes and Moss Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3015 9508 3019 9510 3035 9506 3032 9497
      3032 9467 3015 9461 3005 9459
TIME...MOT...LOC 2317Z 282DEG 22KT 3027 9499 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
2 follow-up statements
824 
WWUS54 KHGX 112347
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
647 PM CDT Tue May 11 2021

TXC291-120000-
/O.CON.KHGX.SV.W.0048.000000T0000Z-210512T0000Z/
Liberty TX-
647 PM CDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR CENTRAL LIBERTY COUNTY...

At 647 PM CDT, a severe thunderstorm was located near Hardin, or 12
miles north of Liberty, moving east at 25 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...
Northeastern Liberty, Daisetta, Hardin, Kenefick, Dayton Lakes and
Moss Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3014 9502 3020 9503 3027 9502 3032 9490
      3032 9467 3015 9461 3005 9459
TIME...MOT...LOC 2347Z 282DEG 22KT 3023 9478 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
317 
WWUS54 KHGX 112357
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
657 PM CDT Tue May 11 2021

TXC291-120006-
/O.EXP.KHGX.SV.W.0048.000000T0000Z-210512T0000Z/
Liberty TX-
657 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LIBERTY COUNTY WILL
EXPIRE AT 700 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However wind 
gusts around 40 mph, small hail, and heavy rain are still possible 
with this thunderstorm.

LAT...LON 3014 9502 3020 9503 3027 9502 3032 9490
      3032 9467 3015 9461 3005 9459
TIME...MOT...LOC 2356Z 282DEG 22KT 3022 9475 

$$

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, 7:25 AM CDTSevere Thunderstorm WarningHGXPolk35 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

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.