Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Austin/San Antonio, TX

April 15, 2021Uvalde County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 15, 2021, 10:42 AM CDT for Uvalde County, Texas. It was in force for 45 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
Apr 15, 2021, 10:42 AM CDT (15:42 UTC)
Expired
Apr 15, 2021, 11:27 AM CDT
In force
45 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Uvalde County, TX

The radar

The Laughlin AFB radar (KDFX), 44 km from the middle of the area, began a volume at 15:41 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.

IssuedProductOfficeLasted
Apr 15, 8:36 AM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 3.7 hours before the alert went out and 97 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 2021-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2593 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2021-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.19395878Sfc1 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
2593 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
634 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
338 m²/s²
Significant tornado parameter
4.6
Supercell composite
21.4

Open this sounding in Storm Lab

The text

As transmitted.

442 
WUUS54 KEWX 151542
SVREWX
TXC463-151645-
/O.NEW.KEWX.SV.W.0040.210415T1542Z-210415T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
1042 AM CDT Thu Apr 15 2021

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Central Uvalde County in south central Texas...

* Until 1145 AM CDT.

* At 1042 AM CDT, a severe thunderstorm was located over Laguna, or
  17 miles northwest of Uvalde, 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...
  Knippa, Laguna, and Concan. 

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 2928 10007 2946 10008 2954 9951 2927 9949
TIME...MOT...LOC 1542Z 265DEG 20KT 2938 10000 

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

BF
2 follow-up statements
651 
WWUS54 KEWX 151601
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1101 AM CDT Thu Apr 15 2021

TXC463-151645-
/O.CON.KEWX.SV.W.0040.000000T0000Z-210415T1645Z/
Uvalde TX-
1101 AM CDT Thu Apr 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR CENTRAL UVALDE COUNTY...

At 1101 AM CDT, a severe thunderstorm was located 7 miles east of
Laguna, or 13 miles northwest of Uvalde, 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...
Knippa and Concan. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2928 9995 2947 9997 2954 9951 2927 9949
TIME...MOT...LOC 1601Z 265DEG 20KT 2939 9988 

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

BF
782 
WWUS54 KEWX 151627
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
1127 AM CDT Thu Apr 15 2021

TXC463-151637-
/O.CAN.KEWX.SV.W.0040.000000T0000Z-210415T1645Z/
Uvalde TX-
1127 AM CDT Thu Apr 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL UVALDE COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
south central Texas.

LAT...LON 2928 9995 2947 9997 2954 9951 2927 9949
TIME...MOT...LOC 1626Z 265DEG 20KT 2940 9971 

$$

BF

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 7:34 AM CDTSpecial Weather StatementEWXKinney41 min
Apr 15, 8:12 AM CDTSpecial Weather StatementEWXEdwards48 min
Apr 15, 8:14 AM CDTSpecial Weather StatementEWXKinney46 min
Apr 15, 8:31 AM CDTSevere Thunderstorm WarningEWXEdwards, Val Verde59 min
Apr 15, 8:40 AM CDTSevere Thunderstorm WarningEWXKinney65 min
Apr 15, 8:55 AM CDTSpecial Weather StatementEWXEdwards50 min
Apr 15, 9:04 AM CDTSevere Thunderstorm WarningEWXEdwards24 min
Apr 15, 9:32 AM CDTSevere Thunderstorm WarningEWXEdwards17 min
Apr 15, 9:42 AM CDTSevere Thunderstorm WarningEWXKinney, Uvalde63 min
Apr 15, 12:15 PM CDTSevere Thunderstorm WarningEWXGillespie, Llano60 min
Apr 15, 1:07 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Llano, Travis53 min
Apr 15, 1:52 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson36 min
Apr 15, 2:07 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson40 min
Apr 15, 2:57 PM CDTSevere Thunderstorm WarningEWXBurnet, Llano63 min
Apr 15, 3:21 PM CDTSevere Thunderstorm WarningEWXBurnet, Williamson54 min
Apr 15, 3:56 PM CDTSevere Thunderstorm WarningEWXTravis, Williamson49 min
Apr 15, 4:11 PM CDTSpecial Weather StatementEWXWilliamson49 min
Apr 15, 4:36 PM CDTSevere Thunderstorm WarningEWXBastrop, Lee, Travis, Williamson54 min
Apr 15, 5:22 PM CDTSevere Thunderstorm WarningEWXBastrop, Fayette, Lee29 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.