Alert archive / Texas / Excessive Heat Warnings in 2023

Excessive Heat Warning 3, NWS Austin/San Antonio, TX

June 21, 20235 counties in Texas

NWS Austin/San Antonio, TX issued this excessive heat warning at Jun 21, 2023, 12:56 PM CDT for 5 counties in Texas. It took effect at Jun 22, 2023, 1:00 PM CDT. It was in force for 3 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 21, 2023, 12:56 PM CDT (17:56 UTC)
In effect from
Jun 22, 2023, 1:00 PM CDT
Expired
Jun 25, 2023, 9:00 PM CDT
In force
3 days
Issued by
NWS Austin/San Antonio, TX

Counties Atascosa County, TX, Dimmit County, TX, Frio County, TX, Maverick County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 95 km from the middle of the area, began a volume at 17:56 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 nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 5.9 hours before the alert went out and 147 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 2023-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 350 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 2023-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 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
350 J/kg
Mixed-layer CIN
-640 J/kg
Mixed-layer LCL
3049 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this excessive heat warning went out at Jun 21, 12:27 PM CDT, 29 minutes earlier.

Area forecast discussion, Jun 21, 12:27 PM CDT, 29 minutes before
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Hazardous weather outlook, Jun 21, 9:37 AM CDT, 3 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
937 AM CDT Wed Jun 21 2023

TXZ171>173-183>194-202>209-217>225-228-221445-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
937 AM CDT Wed Jun 21 2023

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...This Afternoon And Tonight.

A heatwave of historical significance continues today. Combined
with humidity in place across the region, it will be difficult for
folks to stay cool. Residents and visitors will need to take
precautions to avoid heat-related illness.

An Excessive Heat Warning is in effect for all of South Central
Texas through this evening. Maximum heat indices of 105 to 118
degrees and high temperatures of 100 to 112 are expected.

Confidence in scattered severe thunderstorms over Hill Country and
portions of the I-35 Corridor later this afternoon and tonight has
increased slightly. Two rounds of activity are possible. Isolated
to widely scattered storms capable of large hail and damaging
winds will be possible primarily over Hill Country during the 3-10
PM timeframe this afternoon. Additional storms may develop to our
north in the Panhandle later this evening, potentially reaching
areas primarily along and east of I-35 between midnight and 6 AM
tomorrow morning. Damaging winds and large hail would also be
possible in these storms. The Storm Prediction Center has
introduced a level 2 out of 5 risk for severe thunderstorms over
portions of Hill Country and the I-35 Corridor, and has expanded
the level 1 out of 5 risk into the entirety of the Coastal Plains
in light of this potential.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Slightly less hot temperatures are expected Thursday and Friday,
then hotter temperatures return Saturday through Tuesday. A
combination of hot temperatures and high humidity creating high
heat indices will lead to Excessive Heat Warnings and/or Heat
Advisories each day.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Local storm report, Jun 21, 9:34 AM CDT, 3 hours 22 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 7:43 PM CDTSevere Thunderstorm WarningEWXEdwards19 min
Jun 21, 12:56 PM CDTHeat AdvisoryEWXAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more6 days
Jun 21, 3:20 PM CDTSpecial Weather StatementEWXReal40 min
Jun 21, 3:55 PM CDTSpecial Weather StatementEWXKimble50 min
Jun 21, 4:38 PM CDTSpecial Weather StatementEWXKerr52 min
Jun 21, 4:42 PM CDTSpecial Weather StatementEWXBandera48 min
Jun 21, 4:46 PM CDTSevere Thunderstorm WarningEWXGillespie, Kerr59 min
Jun 21, 4:48 PM CDTSevere Thunderstorm WarningEWXBandera, Kerr, Real57 min
Jun 21, 5:15 PM CDTSevere Thunderstorm WarningEWXGillespie45 min
Jun 21, 5:29 PM CDTSevere Thunderstorm WarningEWXKerr46 min
Jun 21, 5:36 PM CDTSpecial Weather StatementEWXReal39 min
Jun 21, 5:45 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Gillespie, Kendall, Kerr, Llano60 min
Jun 21, 5:53 PM CDTAreal Flood AdvisoryEWXBandera, Edwards, Kerr, Real, Uvalde3 hr
Jun 21, 5:55 PM CDTSevere Thunderstorm WarningEWXEdwards, Kinney, Real, Uvalde50 min
Jun 21, 6:19 PM CDTTornado WarningEWXLlano26 min
Jun 21, 6:30 PM CDTSevere Thunderstorm WarningEWXBlanco, Burnet, Comal, Gillespie, Hays, Kendall and 3 more42 min
Jun 21, 6:35 PM CDTAreal Flood AdvisoryEWXBlanco, Burnet, Gillespie, Llano3 hr
Jun 21, 6:43 PM CDTSevere Thunderstorm WarningEWXBlanco, Gillespie, Llano16 min
Jun 21, 6:47 PM CDTSpecial Weather StatementEWXUvalde43 min

Nearby

Excessive Heat Warnings in Texas, 2023Every excessive heat warning in 2023

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.