Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 129, NWS Austin/San Antonio, TX

May 17, 2021Dimmit County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 17, 2021, 6:50 PM CDT for Dimmit County, Texas. It was in force for 25 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 17, 2021, 6:50 PM CDT (23:50 UTC)
Expired: May 17, 2021, 7:15 PM CDT
In force: 25 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Dimmit County, TX

The radar

The Laughlin AFB radar (KDFX), 131 km from the middle of the area, began a volume at 23:53 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 17, 6:40 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.8 hours before the alert went out and 176 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: 2620 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

325 
WUUS54 KEWX 172350
SVREWX
TXC127-180015-
/O.NEW.KEWX.SV.W.0129.210517T2350Z-210518T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
650 PM CDT Mon May 17 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southeastern Dimmit County in south central Texas...

* Until 715 PM CDT.

* At 650 PM CDT, a severe thunderstorm was located over Light, or 17
  miles southwest of Cotulla, moving southeast at 10 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...
  Light, Chaparral Wildlife Management Area and Catarina. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.

&&

LAT...LON 2837 9961 2843 9940 2842 9939 2836 9939
      2821 9940 2820 9949 2820 9962
TIME...MOT...LOC 2350Z 332DEG 9KT 2831 9949 

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

BRADY

1 follow-up statement

538 
WWUS54 KEWX 180000
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
700 PM CDT Mon May 17 2021

TXC127-180015-
/O.CON.KEWX.SV.W.0129.000000T0000Z-210518T0015Z/
Dimmit TX-
700 PM CDT Mon May 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN DIMMIT COUNTY...

At 659 PM CDT, a severe thunderstorm was located over Light, or 17
miles southwest of Cotulla, moving southeast at 10 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Light, Chaparral Wildlife Management Area and Catarina. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 2837 9961 2843 9940 2842 9939 2836 9939
      2821 9940 2820 9949 2820 9962
TIME...MOT...LOC 2359Z 332DEG 9KT 2829 9948 

HAIL...2.00IN
WIND...60MPH
 
$$

BRADY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 9:21 AM CDT	River Flood Warning	EWX	Frio	19 hr
May 17, 11:36 AM CDT	Special Weather Statement	EWX	Burnet	54 min
May 17, 11:58 AM CDT	Special Weather Statement	EWX	Burnet	47 min
May 17, 12:05 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	55 min
May 17, 1:00 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Travis, Williamson	60 min
May 17, 1:53 PM CDT	Special Weather Statement	EWX	Bastrop, Hays, Travis, Williamson	52 min
May 17, 2:34 PM CDT	Flash Flood Watch	EWX	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 19 more	55 hr
May 17, 2:37 PM CDT	Special Weather Statement	EWX	Comal	38 min
May 17, 3:16 PM CDT	Special Weather Statement	EWX	Fayette, Gonzales	44 min
May 17, 3:25 PM CDT	Areal Flood Advisory	EWX	Fayette	3 hr
May 17, 3:51 PM CDT	Special Weather Statement	EWX	Comal	39 min
May 17, 3:59 PM CDT	Special Weather Statement	EWX	Gonzales, Lavaca	61 min
May 17, 4:15 PM CDT	Areal Flood Advisory	EWX	Gonzales, Lavaca	2 hr
May 17, 5:05 PM CDT	Special Weather Statement	EWX	Lavaca	40 min
May 17, 6:08 PM CDT	Special Weather Statement	EWX	Val Verde	52 min
May 17, 6:11 PM CDT	Special Weather Statement	EWX	Dimmit	49 min
May 17, 6:46 PM CDT	Special Weather Statement	EWX	Dimmit	44 min
May 17, 6:48 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	41 min

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.