Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 144, NWS Austin/San Antonio, TX

May 28, 2021Blanco County, Gillespie County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 28, 2021, 6:39 PM CDT for Blanco County, Gillespie County, Texas. It was in force for 66 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 28, 2021, 6:39 PM CDT (23:39 UTC)
Expired: May 28, 2021, 7:45 PM CDT
In force: 66 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Blanco County, TX, Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 88 km from the middle of the area, began a volume at 23:40 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
May 28, 7:15 PM CDT	HAIL 1	6 Nne Hye, TX	COCORAHS OBSERVER REPORTED NICKEL AND QUARTER SIZED HAIL.

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

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 28, 6:20 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.7 hours before the alert went out and 250 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: 3148 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

562 
WUUS54 KEWX 282339
SVREWX
TXC031-171-290045-
/O.NEW.KEWX.SV.W.0144.210528T2339Z-210529T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
639 PM CDT Fri May 28 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Blanco County in south central Texas...
  Southeastern Gillespie County in south central Texas...

* Until 745 PM CDT.

* At 639 PM CDT, a severe thunderstorm was located near Willow City,
  or 15 miles east of Fredericksburg, moving northeast at 15 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Round Mountain, Johnson City, Stonewall, Blowout, Sandy, Willow
  City, Rocky Hill, LBJ State Park, Rocky Creek, Hye, Blumenthal,
  Eckert, Albert 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 3049 9838 3011 9839 3020 9881 3041 9877
      3050 9839
TIME...MOT...LOC 2339Z 245DEG 14KT 3034 9863 

HAIL...1.00IN
WIND...<50MPH
 
$$

CP

1 follow-up statement

210 
WWUS54 KEWX 290021
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
721 PM CDT Fri May 28 2021

TXC031-171-290045-
/O.CON.KEWX.SV.W.0144.000000T0000Z-210529T0045Z/
Blanco TX-Gillespie TX-
721 PM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR NORTHWESTERN BLANCO AND SOUTHEASTERN GILLESPIE COUNTIES...

At 720 PM CDT, severe thunderstorms were located along a line
extending from Sandy to near Blanco, moving east at 15 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with these storms.
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.

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

&&

LAT...LON 3049 9838 3011 9839 3020 9881 3041 9877
      3050 9839
TIME...MOT...LOC 0020Z 290DEG 14KT 3035 9851 3017 9841 

HAIL...1.00IN
WIND...<50MPH
 
$$

CP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:15 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
May 27, 8:15 PM CDT	Special Weather Statement	EWX	Val Verde	45 min
May 27, 8:48 PM CDT	Special Weather Statement	EWX	Val Verde	42 min
May 28, 4:38 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	52 min
May 28, 5:07 PM CDT	Special Weather Statement	EWX	Llano	38 min
May 28, 5:15 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	60 min
May 28, 5:28 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	62 min
May 28, 5:33 PM CDT	Special Weather Statement	EWX	Llano	42 min
May 28, 5:50 PM CDT	Severe Thunderstorm Warning	EWX	Llano	40 min
May 28, 6:06 PM CDT	Areal Flood Advisory	EWX	Burnet, Llano	3 hr
May 28, 6:12 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Travis, Williamson	63 min
May 28, 6:26 PM CDT	Special Weather Statement	EWX	Burnet	34 min
May 28, 6:46 PM CDT	Areal Flood Advisory	EWX	Travis, Williamson	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.