Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 137, NWS Austin/San Antonio, TX

May 18, 2021Fayette County, Gonzales County, Lavaca County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 18, 2021, 4:39 PM CDT for Fayette County, Gonzales County, Lavaca County, Texas. It was in force for 66 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 18, 2021, 4:39 PM CDT (21:39 UTC)
Expired: May 18, 2021, 5:45 PM CDT
In force: 66 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Fayette County, TX, Gonzales County, TX, Lavaca County, TX

The radar

The Austin/San Antonio radar (KEWX), 74 km from the middle of the area, began a volume at 21:42 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 18, 2:29 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 9.7 hours before the alert went out and 205 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: 12 J/kg
Mixed-layer CIN: -595 J/kg
Mixed-layer LCL: 1962 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -66 m²/s²
0-3 km storm-relative helicity: -43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

759 
WUUS54 KEWX 182139
SVREWX
TXC149-177-285-182245-
/O.NEW.KEWX.SV.W.0137.210518T2139Z-210518T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
439 PM CDT Tue May 18 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northeastern Gonzales County in south central Texas...
  Southwestern Fayette County in south central Texas...
  Northwestern Lavaca County in south central Texas...

* Until 545 PM CDT.

* At 439 PM CDT, a severe thunderstorm was located near Gonzales,
  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...
  Gonzales, Flatonia, Moulton, Waelder, Muldoon, Komensky, Freyburg,
  Henkhaus, Moravia, Newtonville, Elm Grove, Engle, O'Quinn, Breslau,
  Nickle, Dilworth, Floy, Witting, Little New York and Thompsonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Texas.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A Tornado Watch remains in effect until 900 PM CDT for south central
Texas.

LAT...LON 2941 9748 2967 9751 2985 9698 2954 9691
TIME...MOT...LOC 2139Z 253DEG 18KT 2961 9746 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

MO

1 follow-up statement

402 
WWUS54 KEWX 182236
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
536 PM CDT Tue May 18 2021

TXC149-177-285-182245-
/O.EXP.KEWX.SV.W.0137.000000T0000Z-210518T2245Z/
Gonzales TX-Fayette TX-Lavaca TX-
536 PM CDT Tue May 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GONZALES...
SOUTHWESTERN FAYETTE AND NORTHWESTERN LAVACA COUNTIES WILL EXPIRE AT
545 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 heavy rain
is still possible with this thunderstorm.

A Tornado Watch remains in effect until 900 PM CDT for south central
Texas.

LAT...LON 2941 9748 2967 9751 2985 9698 2954 9691
TIME...MOT...LOC 2235Z 253DEG 18KT 2969 9715 

$$

YB

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 7:14 PM CDT	Severe Thunderstorm Warning	EWX	Dimmit	26 min
May 17, 7:46 PM CDT	Special Weather Statement	EWX	Dimmit	44 min
May 17, 8:44 PM CDT	Special Weather Statement	EWX	Dimmit	46 min
May 17, 9:36 PM CDT	Areal Flood Advisory	EWX	Dimmit, Zavala	3 hr
May 17, 9:40 PM CDT	Special Weather Statement	EWX	Dimmit	50 min
May 17, 10:10 PM CDT	Special Weather Statement	EWX	Frio	50 min
May 17, 10:39 PM CDT	Areal Flood Advisory	EWX	Dimmit, Frio, Zavala	2 hr
May 17, 10:47 PM CDT	Special Weather Statement	EWX	Dimmit	28 min
May 18, 9:56 AM CDT	Special Weather Statement	EWX	Real	49 min
May 18, 10:29 AM CDT	Special Weather Statement	EWX	Kerr	46 min
May 18, 11:35 AM CDT	Special Weather Statement	EWX	Real	55 min
May 18, 11:58 AM CDT	Areal Flood Advisory	EWX	Edwards, Kerr, Real, Val Verde	5 hr
May 18, 12:54 PM CDT	Special Weather Statement	EWX	Bandera, Gillespie, Kendall	51 min
May 18, 1:29 PM CDT	Special Weather Statement	EWX	Blanco, Kendall	46 min
May 18, 1:51 PM CDT	Severe Thunderstorm Warning	EWX	Bexar, Blanco, Comal, Kendall	54 min
May 18, 2:01 PM CDT	Areal Flood Advisory	EWX	Bandera, Bexar, Comal, Kendall, Medina	3 hr
May 18, 2:38 PM CDT	Special Weather Statement	EWX	Comal, Hays	67 min
May 18, 2:46 PM CDT	Areal Flood Advisory	EWX	Bexar, Comal	3 hr
May 18, 2:46 PM CDT	Severe Thunderstorm Warning	EWX	Comal, Hays	59 min
May 18, 3:04 PM CDT	Special Weather Statement	EWX	Wilson	41 min
May 18, 3:35 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Comal, Guadalupe	55 min
May 18, 3:36 PM CDT	Areal Flood Advisory	EWX	Bexar, Caldwell, Comal, Guadalupe, Hays, Wilson	3 hr
May 18, 3:40 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Comal, Hays, Travis	65 min
May 18, 3:59 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Comal	3 hr
May 18, 3:59 PM CDT	Special Weather Statement	EWX	Gonzales	46 min
May 18, 4:24 PM CDT	Severe Thunderstorm Warning	EWX	Caldwell, Gonzales, Guadalupe	66 min
May 18, 4:27 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Caldwell, Fayette, Gonzales, Lee, Travis	63 min
May 18, 4:48 PM CDT	Tornado Warning	EWX	Lavaca	27 min
May 18, 5:03 PM CDT	Areal Flood Advisory	EWX	Fayette, Gonzales, Lavaca	3 hr
May 18, 5:15 PM CDT	Special Weather Statement	EWX	Wilson	45 min
May 18, 5:21 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Caldwell, Gonzales, Guadalupe	3 hr
May 18, 5:28 PM CDT	Areal Flood Advisory	EWX	Frio	3 hr
May 18, 5:29 PM CDT	Special Weather Statement	EWX	Frio	46 min
May 18, 5:31 PM CDT	Special Weather Statement	EWX	Lee	44 min
May 18, 5:35 PM CDT	Special Weather Statement	EWX	Gonzales	40 min
May 18, 5:39 PM CDT	Special Weather Statement	EWX	Fayette	51 min
May 18, 5:42 PM CDT	Severe Thunderstorm Warning	EWX	Atascosa, Frio	24 min
May 18, 6:06 PM CDT	Areal Flood Advisory	EWX	Bastrop, Lee	3 hr
May 18, 6:14 PM CDT	Tornado Warning	EWX	Fayette	31 min
May 18, 6:26 PM CDT	Tornado Warning	EWX	Fayette	34 min
May 18, 6:39 PM CDT	Tornado Warning	EWX	Lavaca	51 min
May 18, 6:41 PM CDT	Tornado Warning Tornado observed	EWX	Fayette	34 min
May 18, 6:44 PM CDT	Flash Flood Warning Considerable damage threat	EWX	Fayette, Gonzales, Lavaca	8 hr
May 18, 6:53 PM CDT	Areal Flood Advisory	EWX	DeWitt, Gonzales, Karnes, Lavaca, Wilson	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.