Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 131, NWS Austin/San Antonio, TX

May 18, 20214 counties in Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 18, 2021, 1:51 PM CDT for 4 counties in Texas. It was in force for 54 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 18, 2021, 1:51 PM CDT (18:51 UTC)
Expired
May 18, 2021, 2:45 PM CDT
In force
54 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Bexar County, TX, Blanco County, TX, Comal County, TX, Kendall County, TX

The radar

The Austin/San Antonio radar (KEWX), 54 km from the middle of the area, began a volume at 18:52 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

TimeReportWhereRemark
May 18, 2:14 PM CDTTSTM WND DMG1 Nne Bulverde, TXA FEW LONG TREE LIMBS DOWN THAT WERE 4 TO 5 INCHES IN DIAMETER IN AND AROUND BULVERDE.

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 12:00Z, 6.9 hours before the alert went out and 233 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-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 2021-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 574 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2021-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
574 J/kg
Mixed-layer CIN
-294 J/kg
Mixed-layer LCL
1177 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted.

227 
WUUS54 KEWX 181851
SVREWX
TXC029-031-091-259-181945-
/O.NEW.KEWX.SV.W.0131.210518T1851Z-210518T1945Z/

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

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Southwestern Blanco County in south central Texas...
  Eastern Kendall County in south central Texas...
  North central Bexar County in south central Texas...
  Northwestern Comal County in south central Texas...

* Until 245 PM CDT.

* At 151 PM CDT, severe thunderstorms were located along a line
  extending from near Sisterdale to near Fair Oaks Ranch, moving
  northeast at 15 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...
  Boerne, Blanco, Canyon Lake, Fair Oaks Ranch, Bulverde, Cross
  Mountain, Guadalupe River State Park, Kendalia, Smithson Valley,
  Leon Springs, Kreutzberg, Spring Branch, Twin Sisters, Bergheim,
  The Dominion, Timberwood Park, Sisterdale, Anhalt, Specht Store and
  Scenic Oaks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3014 9844 2977 9833 2964 9866 2995 9873
TIME...MOT...LOC 1851Z 234DEG 12KT 2992 9870 2971 9864 

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

MO
3 follow-up statements
192 
WWUS54 KEWX 181900
SVSEWX

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

TXC029-031-091-259-181945-
/O.CON.KEWX.SV.W.0131.000000T0000Z-210518T1945Z/
Blanco TX-Kendall TX-Bexar TX-Comal TX-
200 PM CDT Tue May 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR SOUTHWESTERN BLANCO...EASTERN KENDALL...NORTH CENTRAL BEXAR AND
NORTHWESTERN COMAL COUNTIES...

At 200 PM CDT, severe thunderstorms were located along a line
extending from near Kendalia to near Timberwood Park, moving east at
30 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...
Boerne, Blanco, Canyon Lake, Fair Oaks Ranch, Bulverde, Cross
Mountain, Guadalupe River State Park, Kendalia, Smithson Valley, Leon
Springs, Kreutzberg, Spring Branch, Twin Sisters, Bergheim, The
Dominion, Timberwood Park, Sisterdale, Anhalt, Specht Store and
Scenic Oaks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3014 9844 2977 9833 2964 9866 2995 9873
TIME...MOT...LOC 1900Z 252DEG 28KT 2994 9860 2973 9854 

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

MO
976 
WWUS54 KEWX 181915
SVSEWX

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

TXC029-031-091-259-181945-
/O.CON.KEWX.SV.W.0131.000000T0000Z-210518T1945Z/
Blanco TX-Kendall TX-Bexar TX-Comal TX-
215 PM CDT Tue May 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR SOUTH CENTRAL BLANCO...SOUTHEASTERN KENDALL...NORTH CENTRAL BEXAR
AND NORTHWESTERN COMAL COUNTIES...

At 214 PM CDT, severe thunderstorms were located along a line
extending from Kendalia to Bulverde, moving east at 25 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...
Canyon Lake, Bulverde, Guadalupe River State Park, Kendalia, Spring
Branch, Smithson Valley, Twin Sisters, Bergheim, Timberwood Park,
Anhalt, Honey Creek State Natural Area and Specht Store.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3007 9842 2977 9833 2968 9855 2997 9865
TIME...MOT...LOC 1914Z 248DEG 22KT 2997 9853 2976 9847 

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

MO
630 
WWUS54 KEWX 181936
SVSEWX

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

TXC029-181944-
/O.CAN.KEWX.SV.W.0131.000000T0000Z-210518T1945Z/
Bexar TX-
236 PM CDT Tue May 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BEXAR COUNTY IS
CANCELLED...

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

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

LAT...LON 3007 9842 2977 9833 2974 9840 2975 9841
      2972 9844 2974 9845 2974 9848 3001 9856
TIME...MOT...LOC 1934Z 234DEG 12KT 3001 9847 2980 9841 

$$

TXC031-091-259-181945-
/O.CON.KEWX.SV.W.0131.000000T0000Z-210518T1945Z/
Blanco TX-Kendall TX-Comal TX-
236 PM CDT Tue May 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM CDT
FOR SOUTH CENTRAL BLANCO...EAST CENTRAL KENDALL AND NORTHWESTERN
COMAL COUNTIES...

At 234 PM CDT, severe thunderstorms were located along a line
extending from near Twin Sisters to near Smithson Valley, moving 
northeast at 15 mph. The storm has weakened slightly...and the 
warning will be allowed to expire at 245 pm CDT.

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...
Canyon Lake, Bulverde, Guadalupe River State Park, Kendalia, Spring
Branch, Smithson Valley, Twin Sisters, Anhalt and Honey Creek State
Natural Area.

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.

&&

LAT...LON 3007 9842 2977 9833 2974 9840 2975 9841
      2972 9844 2974 9845 2974 9848 3001 9856
TIME...MOT...LOC 1934Z 234DEG 12KT 3001 9847 2980 9841 

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

MO

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 7:14 PM CDTSevere Thunderstorm WarningEWXDimmit26 min
May 17, 7:46 PM CDTSpecial Weather StatementEWXDimmit44 min
May 17, 8:44 PM CDTSpecial Weather StatementEWXDimmit46 min
May 17, 9:36 PM CDTAreal Flood AdvisoryEWXDimmit, Zavala3 hr
May 17, 9:40 PM CDTSpecial Weather StatementEWXDimmit50 min
May 17, 10:10 PM CDTSpecial Weather StatementEWXFrio50 min
May 17, 10:39 PM CDTAreal Flood AdvisoryEWXDimmit, Frio, Zavala2 hr
May 17, 10:47 PM CDTSpecial Weather StatementEWXDimmit28 min
May 18, 9:56 AM CDTSpecial Weather StatementEWXReal49 min
May 18, 10:29 AM CDTSpecial Weather StatementEWXKerr46 min
May 18, 11:35 AM CDTSpecial Weather StatementEWXReal55 min
May 18, 11:58 AM CDTAreal Flood AdvisoryEWXEdwards, Kerr, Real, Val Verde5 hr
May 18, 12:54 PM CDTSpecial Weather StatementEWXBandera, Gillespie, Kendall51 min
May 18, 1:29 PM CDTSpecial Weather StatementEWXBlanco, Kendall46 min
May 18, 2:01 PM CDTAreal Flood AdvisoryEWXBandera, Bexar, Comal, Kendall, Medina3 hr
May 18, 2:38 PM CDTSpecial Weather StatementEWXComal, Hays67 min
May 18, 2:46 PM CDTAreal Flood AdvisoryEWXBexar, Comal3 hr
May 18, 2:46 PM CDTSevere Thunderstorm WarningEWXComal, Hays59 min
May 18, 3:04 PM CDTSpecial Weather StatementEWXWilson41 min
May 18, 3:35 PM CDTSevere Thunderstorm WarningEWXCaldwell, Comal, Guadalupe55 min
May 18, 3:36 PM CDTAreal Flood AdvisoryEWXBexar, Caldwell, Comal, Guadalupe, Hays, Wilson3 hr
May 18, 3:40 PM CDTSevere Thunderstorm WarningEWXCaldwell, Comal, Hays, Travis65 min
May 18, 3:59 PM CDTFlash Flood Warning Considerable damage threatEWXComal3 hr
May 18, 3:59 PM CDTSpecial Weather StatementEWXGonzales46 min
May 18, 4:24 PM CDTSevere Thunderstorm WarningEWXCaldwell, Gonzales, Guadalupe66 min
May 18, 4:27 PM CDTSevere Thunderstorm WarningEWXBastrop, Caldwell, Fayette, Gonzales, Lee, Travis63 min
May 18, 4:39 PM CDTSevere Thunderstorm WarningEWXFayette, Gonzales, Lavaca66 min
May 18, 4:48 PM CDTTornado WarningEWXLavaca27 min
May 18, 5:03 PM CDTAreal Flood AdvisoryEWXFayette, Gonzales, Lavaca3 hr
May 18, 5:15 PM CDTSpecial Weather StatementEWXWilson45 min
May 18, 5:21 PM CDTFlash Flood Warning Considerable damage threatEWXCaldwell, Gonzales, Guadalupe3 hr
May 18, 5:28 PM CDTAreal Flood AdvisoryEWXFrio3 hr
May 18, 5:29 PM CDTSpecial Weather StatementEWXFrio46 min
May 18, 5:31 PM CDTSpecial Weather StatementEWXLee44 min
May 18, 5:35 PM CDTSpecial Weather StatementEWXGonzales40 min
May 18, 5:39 PM CDTSpecial Weather StatementEWXFayette51 min
May 18, 5:42 PM CDTSevere Thunderstorm WarningEWXAtascosa, Frio24 min
May 18, 6:06 PM CDTAreal Flood AdvisoryEWXBastrop, Lee3 hr
May 18, 6:14 PM CDTTornado WarningEWXFayette31 min
May 18, 6:26 PM CDTTornado WarningEWXFayette34 min
May 18, 6:39 PM CDTTornado WarningEWXLavaca51 min
May 18, 6:41 PM CDTTornado Warning Tornado observedEWXFayette34 min
May 18, 6:44 PM CDTFlash Flood Warning Considerable damage threatEWXFayette, Gonzales, Lavaca8 hr
May 18, 6:53 PM CDTAreal Flood AdvisoryEWXDeWitt, Gonzales, Karnes, Lavaca, Wilson3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every 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.