Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 143, NWS Austin/San Antonio, TX

May 28, 20214 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 28, 2021, 6:12 PM CDT for 4 counties in Texas. It was in force for 63 min. 9 reports 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, 6:12 PM CDT (23:12 UTC)
Expired: May 28, 2021, 7:15 PM CDT
In force: 63 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Tornado: Possible
Hail: 1.5 in
Wind: 70.0 mph

Counties Blanco County, TX, Burnet County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 37 km from the middle of the area, began a volume at 23:13 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, 6:34 PM CDT	TSTM WND GST 64	2 E Briarcliff, TX	64 MPH WIND GUST MEASURED AT A PERSONAL WEATHER STATION NEAR THURMAN BEND RD.
May 28, 6:35 PM CDT	TSTM WND GST 58	Volente, TX	CWOP STATION REPORTED 58 MPH WIND GUST. FM 2769 AT HILL ST.
May 28, 6:35 PM CDT	HAIL 0.7	2 Se Lakeway, TX	CORRECTS PREVIOUS HAIL REPORT FROM 2 SE LAKEWAY. TRAINED SPOTTER REPORTED HAIL UP TO DIME SIZE AND A FEW 1-2 INCH LIMBS DAMAGED BY WIND.
May 28, 6:35 PM CDT	HAIL 0.7	2 Se Lakeway, TX	TRAINED SPOTTER REPORTED HAIL UP TO DIME SIZE AND A FEW 1-2 INCH LIMBS DAMAGED BY HAIL.
May 28, 6:38 PM CDT	TSTM WND GST 67	2 Se Volente, TX	CWOP MESONET STATION NEAR VILLA MONTANA WAY REPORTED 67 MPH WIND GUST.
May 28, 6:40 PM CDT	HAIL 0.75	Point Venture, TX	REPORT FROM MPING: DIME (0.75 IN.).
May 28, 7:11 PM CDT	TSTM WND GST 60	2 Sw Bergstrom Internat, TX	ASOS STATION KAUS AUSTIN-BERGSTROM INTL ARPT.
May 28, 7:14 PM CDT	TSTM WND GST 60	6 S Wells Branch, TX	CORRECTS PREVIOUS NON-TSTM WND GST REPORT FROM 6 S WELLS BRANCH. ESTIMATED 60 MPH GUSTS AT RUNDBERG AND I-35, ABOUT AN INCH OF WATER ON I-35 REPORTED AS WELL WITH TORRENTIAL RAINFALL.
May 28, 7:14 PM CDT	NON-TSTM WND GST 60	6 S Wells Branch, TX	ESTIMATED 60 MPH GUSTS AT RUNDBERG AND I-35, ABOUT AN INCH OF WATER ON I-35 REPORTED AS WELL WITH TORRENTIAL RAINFALL.

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, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.2 hours before the alert went out and 252 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: 313 J/kg
Mixed-layer CIN: -386 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WUUS54 KEWX 282312
SVREWX
TXC031-053-453-491-290015-
/O.NEW.KEWX.SV.W.0143.210528T2312Z-210529T0015Z/

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

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Williamson County in south central Texas...
  Travis County in south central Texas...
  Northeastern Blanco County in south central Texas...
  Central Burnet County in south central Texas...

* Until 715 PM CDT.

* At 611 PM CDT, severe thunderstorms were located along a line
  extending from Bertram to near Smithwick to near Round Mountain,
  moving southeast at 35 mph.

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
  Burnet, Marble Falls, Granger, Bertram, Round Mountain, Tanglewood
  Forest, Serenada, Anderson Mill, Austin Bergstrom Int Airport,
  Windemere, Leander, Hutto, Lakeway and Manor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Travis, get away from the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

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

&&

LAT...LON 3083 9750 3079 9742 3024 9755 3009 9777
      3047 9836 3093 9810
TIME...MOT...LOC 2311Z 311DEG 32KT 3075 9805 3053 9809 3048 9830 

TORNADO...POSSIBLE
HAIL...1.50IN
WIND...70MPH
 
$$

CP

2 follow-up statements

137 
WWUS54 KEWX 282329
SVSEWX

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

TXC031-053-453-491-290015-
/O.CON.KEWX.SV.W.0143.000000T0000Z-210529T0015Z/
Williamson TX-Travis TX-Blanco TX-Burnet TX-
629 PM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR WILLIAMSON...TRAVIS...NORTHEASTERN BLANCO AND CENTRAL BURNET
COUNTIES...

At 628 PM CDT, severe thunderstorms were located along a line
extending from near Liberty Hill to Lago Vista to near Cypress Mill,
moving southeast at 30 mph.

HAZARD...Tennis ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
Burnet, Marble Falls, Granger, Bertram, Round Mountain, Tanglewood
Forest, Serenada, Anderson Mill, Austin Bergstrom Int Airport,
Windemere, Leander, Hutto, Lakeway and Manor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Travis, get away from the water and move indoors 
or inside a vehicle. remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

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

&&

LAT...LON 3083 9750 3079 9742 3024 9755 3009 9777
      3047 9836 3093 9810
TIME...MOT...LOC 2328Z 317DEG 27KT 3066 9794 3044 9799 3039 9819 

TORNADO...POSSIBLE
HAIL...2.50IN
WIND...70MPH
 
$$

CP

996 
WWUS54 KEWX 282351
SVSEWX

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

TXC031-053-290000-
/O.CAN.KEWX.SV.W.0143.000000T0000Z-210529T0015Z/
Blanco TX-Burnet TX-
651 PM CDT Fri May 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BLANCO AND
CENTRAL BURNET COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
south central Texas.

LAT...LON 3079 9742 3024 9755 3009 9777 3035 9816
      3046 9810 3076 9797 3083 9751
TIME...MOT...LOC 2350Z 308DEG 34KT 3074 9776 3054 9774 3030 9780 3015
9787

$$

TXC453-491-290015-
/O.CON.KEWX.SV.W.0143.000000T0000Z-210529T0015Z/
Williamson TX-Travis TX-
651 PM CDT Fri May 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CENTRAL WILLIAMSON AND TRAVIS COUNTIES...

At 650 PM CDT, severe thunderstorms were located along a line
extending from near Sun City to near Round Rock to West Lake Hills to
Shady Hollow, moving southeast at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, Taylor,
Granger, Tanglewood Forest, Serenada, Anderson Mill, Austin Bergstrom
Int Airport, Windemere, Leander, Hutto, Lakeway, Manor, Lago Vista,
Bee Cave, West Lake Hills and Hudson Bend.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Travis, get away from the water and move indoors 
or inside a vehicle. remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

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

&&

LAT...LON 3079 9742 3024 9755 3009 9777 3035 9816
      3046 9810 3076 9797 3083 9751
TIME...MOT...LOC 2350Z 308DEG 34KT 3074 9776 3054 9774 3030 9780 3015
9787

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

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, 6:26 PM CDT	Special Weather Statement	EWX	Burnet	34 min
May 28, 6:39 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Gillespie	66 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.