Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 175, NWS Austin/San Antonio, TX

June 21, 20215 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Jun 21, 2021, 11:13 PM CDT for 5 counties in Texas. It was in force for 62 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: Jun 21, 2021, 11:13 PM CDT (04:13 UTC)
Expired: Jun 22, 2021, 12:15 AM CDT
In force: 62 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Blanco County, TX, Burnet County, TX, Gillespie County, TX, Hays County, TX, Llano County, TX

The radar

The Austin/San Antonio radar (KEWX), 80 km from the middle of the area, began a volume at 04:16 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
Jun 22, 12:08 AM CDT	TSTM WND GST 60	2 N Lbj State Park, TX	MESONET STATION BDTT2 BIRD.

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

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 4.2 hours before the alert went out and 273 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: 3252 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1433 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

844 
WUUS54 KEWX 220413
SVREWX
TXC031-053-171-209-299-220515-
/O.NEW.KEWX.SV.W.0175.210622T0413Z-210622T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
1113 PM CDT Mon Jun 21 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Hays County in south central Texas...
  Blanco County in south central Texas...
  East central Gillespie County in south central Texas...
  Southeastern Llano County in south central Texas...
  Southwestern Burnet County in south central Texas...

* Until 1215 AM CDT.

* At 1113 PM CDT, a severe thunderstorm was located over Horseshoe
  Bay, or near Round Mountain, moving south at 10 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Marble Falls, Round Mountain, Granite Shoals, Horseshoe Bay,
  Johnson City, Meadowlakes, Stonewall, Spicewood, Blowout, Sandy,
  LBJ State Park, Rocky Creek, Hye, Cypress Mill, Henly, Pedernales
  Falls State Park, Cottonwood Shores, Sunrise Beach Village and LBJ
  National Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3054 9814 3039 9815 3036 9817 3034 9815
      3013 9816 3025 9871 3062 9853
TIME...MOT...LOC 0413Z 005DEG 11KT 3051 9836 

HAIL...0.75IN
WIND...70MPH
 
$$

YB

1 follow-up statement

647 
WWUS54 KEWX 220439
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1139 PM CDT Mon Jun 21 2021

TXC053-209-299-220448-
/O.CAN.KEWX.SV.W.0175.000000T0000Z-210622T0515Z/
Hays TX-Llano TX-Burnet TX-
1139 PM CDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HAYS...
SOUTHEASTERN LLANO AND SOUTHWESTERN BURNET COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 3047 9827 3044 9824 3020 9833 3025 9871
      3050 9859 3050 9840
TIME...MOT...LOC 0438Z 005DEG 11KT 3043 9837 

$$

TXC031-171-220515-
/O.CON.KEWX.SV.W.0175.000000T0000Z-210622T0515Z/
Blanco TX-Gillespie TX-
1139 PM CDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR NORTHWESTERN BLANCO AND EAST CENTRAL GILLESPIE COUNTIES...

At 1138 PM CDT, a severe thunderstorm was located over Round
Mountain, moving south at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Round Mountain, Johnson City, Stonewall, Rocky Creek, Hye, Blowout,
Sandy, LBJ State Park and LBJ National Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3047 9827 3044 9824 3020 9833 3025 9871
      3050 9859 3050 9840
TIME...MOT...LOC 0438Z 005DEG 11KT 3043 9837 

HAIL...<.75IN
WIND...60MPH
 
$$

YB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 9:12 PM CDT	Special Weather Statement	EWX	Val Verde	48 min
Jun 21, 9:25 PM CDT	Severe Thunderstorm Warning	EWX	Val Verde	65 min
Jun 21, 9:43 PM CDT	Special Weather Statement	EWX	Williamson	47 min
Jun 21, 10:25 PM CDT	Special Weather Statement	EWX	Burnet, Llano, Williamson	50 min
Jun 21, 10:35 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Travis	55 min
Jun 21, 10:51 PM CDT	Tornado Warning	EWX	Blanco, Burnet, Hays	24 min
Jun 21, 10:52 PM CDT	Areal Flood Advisory	EWX	Burnet, Williamson	3 hr
Jun 21, 11:08 PM CDT	Areal Flood Advisory	EWX	Val Verde	3 hr
Jun 21, 11:31 PM CDT	Areal Flood Advisory	EWX	Burnet, Travis, Williamson	3 hr
Jun 21, 11:53 PM CDT	Special Weather Statement	EWX	Gillespie	52 min
Jun 22, 12:00 AM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Llano	3 hr
Jun 22, 12:09 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kendall, Kerr	39 min
Jun 22, 12:19 AM CDT	Special Weather Statement	EWX	Travis	41 min
Jun 22, 12:24 AM CDT	Special Weather Statement	EWX	Edwards	51 min
Jun 22, 12:30 AM CDT	Areal Flood Advisory	EWX	Williamson	3 hr
Jun 22, 12:47 AM CDT	Special Weather Statement	EWX	Bandera	43 min
Jun 22, 1:16 AM CDT	Special Weather Statement	EWX	Bandera, Medina, Real, Uvalde	44 min
Jun 22, 1:54 AM CDT	Special Weather Statement	EWX	Kinney	51 min
Jun 22, 2:08 AM CDT	Areal Flood Advisory	EWX	Edwards, Real	5 hr
Jun 22, 2:23 AM CDT	Special Weather Statement	EWX	Fayette	52 min
Jun 22, 2:52 AM CDT	Areal Flood Advisory	EWX	Edwards, Kinney, Uvalde, Val Verde	4 hr
Jun 22, 3:01 AM CDT	Special Weather Statement	EWX	Kinney	44 min
Jun 22, 3:13 AM CDT	Special Weather Statement	EWX	Fayette	47 min
Jun 22, 4:00 AM CDT	Special Weather Statement	EWX	Gonzales	45 min
Jun 22, 4:33 AM CDT	Special Weather Statement	EWX	DeWitt, Gonzales	42 min
Jun 22, 5:22 AM CDT	Areal Flood Advisory	EWX	Bexar	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.