Alert archive / Texas / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 311, NWS Austin/San Antonio, TX

September 24, 2023Burnet County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Sep 24, 2023, 6:55 PM CDT for Burnet County, Williamson County, Texas. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 24, 2023, 6:55 PM CDT (23:55 UTC)
Expired
Sep 24, 2023, 8:00 PM CDT
In force
65 min
Issued by
NWS Austin/San Antonio, TX
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Burnet County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 49 km from the middle of the area, began a volume at 23:58 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
Sep 24, 4:51 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 242 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, Fort Worth, TX at 12:00Z on 2023-09-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1417 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, Fort Worth, TX at 12:00Z on 2023-09-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
1417 J/kg
Mixed-layer CIN
-262 J/kg
Mixed-layer LCL
1404 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
303 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Sep 24, 5:10 PM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, Sep 24, 5:10 PM CDT, 1 hour 45 minutes before
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Hazardous weather outlook, Sep 24, 5:23 PM CDT, 1 hour 32 minutes before
Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
523 PM CDT Sun Sep 24 2023

TXZ171>173-183>194-202>209-217>225-228-252230-
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-
523 PM CDT Sun Sep 24 2023

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

.DAY ONE...Tonight.

A slight (level 2/5) risk continues this evening over portions of
Hill Country and the I-35 Corridor, where scattered storms have
begun to develop. A Severe Thunderstorm Watch has been issued by
the Storm Prediction Center through 11 PM for Blanco, Burnet,
Gillespie, Llano, and Williamson Counties. Large hail and
damaging wind gusts will be the main hazards in any severe storms.
Have multiple ways of receiving warning information over this
portion of South-Central Texas this evening.

Dangerous heat & humidity will continue through early evening
along/east of I-35 and over portions of the southern Edwards
Plateau. A Heat Advisory remains in effect through 7 PM.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Additional showers and thunderstorms are expected across the area
on Monday afternoon. Locally heavy rainfall, gusty winds, and hail
will be possible in this activity. A marginal (level 1/5) risk for
severe thunderstorms continues over most of the area given this
potential, in addition to a marginal (level 1/4) risk for
excessive rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

In the hours before

Special weather statement, Sep 24, 5:37 PM CDT, 1 hour 18 minutes before
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Special weather statement, Sep 24, 5:38 PM CDT, 1 hour 17 minutes before
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Special weather statement, Sep 24, 5:48 PM CDT, 1 hour 7 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
548 PM CDT Sun Sep 24 2023

TXZ171-172-188-190-242330-
Blanco TX-Gillespie TX-Llano TX-Burnet TX-
548 PM CDT Sun Sep 24 2023

...Strong thunderstorms will impact portions of northwestern Blanco,
Gillespie, Llano and Burnet Counties through 630 PM CDT...

At 548 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles west of Lampasas to Tow to near Stolz
to Oxford to 6 miles northeast of Tivydale. Movement was east at 15
mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Fredericksburg, Burnet, Marble Falls, Kingsland, Llano, Round
Mountain, Buchanan Dam, Gainesville, Granite Shoals, Horseshoe Bay,
Meadowlakes, Buchanan Lake Village, Stonewall, Highland Haven, Inks
Lake State Park, Blowout, Watson, Bluffton, Rocky Hill, and Lake
Victor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Texas.

&&

LAT...LON 3031 9834 3016 9885 3032 9915 3092 9853
      3093 9842 3094 9841 3095 9845 3096 9845
      3098 9844 3100 9845 3103 9842 3104 9794
TIME...MOT...LOC 2248Z 292DEG 12KT 3109 9830 3092 9845 3075 9858 3060
9868 3033 9905

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

CP
Special weather statement, Sep 24, 6:24 PM CDT, 31 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
624 PM CDT Sun Sep 24 2023

TXZ171-172-188-190-250015-
Blanco TX-Gillespie TX-Llano TX-Burnet TX-
624 PM CDT Sun Sep 24 2023

...Strong thunderstorms will impact portions of northwestern Blanco,
eastern Gillespie, southeastern Llano and southern Burnet Counties
through 715 PM CDT...

At 623 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles northwest of Burnet to 6 miles
southwest of Kingsland to Enchanted Rock State Natural Area to 6
miles west of Fredericksburg. Movement was east at 10 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Fredericksburg, Burnet, Marble Falls, Kingsland, Llano, Bertram,
Round Mountain, Buchanan Dam, Gainesville, Granite Shoals, Horseshoe
Bay, Johnson City, Meadowlakes, Buchanan Lake Village, Stonewall,
Highland Haven, Inks Lake State Park, Blowout, Bluffton, and Rocky
Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Texas.

&&

LAT...LON 3088 9795 3018 9835 3014 9876 3014 9884
      3027 9910 3065 9879 3088 9844
TIME...MOT...LOC 2323Z 287DEG 10KT 3082 9830 3059 9850 3051 9879 3026
9898

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

CP
Special weather statement, Sep 24, 6:43 PM CDT, 12 minutes before
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Special weather statement, Sep 24, 6:51 PM CDT, 4 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
651 PM CDT Sun Sep 24 2023

TXZ172-173-250030-
Williamson TX-Burnet TX-
651 PM CDT Sun Sep 24 2023

...A strong thunderstorm will impact portions of northwestern
Williamson and northeastern Burnet Counties through 730 PM CDT...

At 651 PM CDT, Doppler radar was tracking a strong thunderstorm near
Briggs, or 9 miles south of Copperas Cove, moving southeast at 20
mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Florence, Watson, Andice, and Briggs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Texas.

&&

LAT...LON 3103 9790 3091 9783 3090 9777 3088 9767
      3086 9764 3074 9782 3095 9805 3104 9796
      3103 9791
TIME...MOT...LOC 2351Z 317DEG 15KT 3097 9791

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

CP

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 23, 11:22 PM CDTSpecial Weather StatementEWXVal Verde53 min
Sep 24, 2:59 AM CDTHeat AdvisoryEWXAtascosa, Bastrop, Bexar, Caldwell, Comal, DeWitt and 13 more16 hr
Sep 24, 5:37 PM CDTSpecial Weather StatementEWXLlano38 min
Sep 24, 5:38 PM CDTSpecial Weather StatementEWXGillespie52 min
Sep 24, 5:48 PM CDTSpecial Weather StatementEWXBurnet, Gillespie, Llano42 min
Sep 24, 6:24 PM CDTSpecial Weather StatementEWXBlanco, Burnet, Gillespie, Llano51 min
Sep 24, 6:43 PM CDTSpecial Weather StatementEWXLlano47 min
Sep 24, 6:51 PM CDTSpecial Weather StatementEWXWilliamson39 min
Sep 24, 6:58 PM CDTSpecial Weather StatementEWXGillespie47 min

Nearby

Severe Thunderstorm Warnings in Texas, 2023Every severe thunderstorm 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.