Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Austin/San Antonio, TX

May 10, 2017Val Verde County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at May 10, 2017, 4:49 PM CDT for Val Verde County, Texas. It was in force for 26 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
May 10, 2017, 4:49 PM CDT (21:49 UTC)
Expired
May 10, 2017, 5:15 PM CDT
In force
26 min
Issued by
NWS Austin/San Antonio, TX

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 132 km from the middle of the area, began a volume at 21:49 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 (KDLF), launched 12:00Z, 9.8 hours before the alert went out and 80 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 2017-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 557 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 2017-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.1939587897Sfc1 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
557 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
871 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.1
Supercell composite
6.6

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 10, 3:09 PM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, May 10, 3:09 PM CDT, 1 hour 40 minutes before
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Hazardous weather outlook, May 10, 3:14 PM CDT, 1 hour 35 minutes before
Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
314 PM CDT Wed May 10 2017

TXZ171>173-183>194-202>209-217>225-228-112015-
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-
314 PM CDT Wed May 10 2017

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

.DAY ONE...This Afternoon And Tonight.
Isolated strong storms will be possible this afternoon and should
increase in coverage into the late evening across the Edwards
Plateau and especially Val Verde County. Hail and damaging winds
are the main threats.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
A marginal risk for severe weather will be possible mostly along
and east of the Interstate 35 corridor Thursday. Again,
marginally severe hail and gusty winds will be the main threats.

.SPOTTER INFORMATION STATEMENT...
Spotters are encouraged to report severe weather reports to the
National Weather Service this evening and tomorrow if needed.

TB3

In the hours before

Special weather statement, May 10, 2:05 PM CDT, 2 hours 44 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
205 PM CDT WED MAY 10 2017

TXZ183-101945-
Val Verde TX-
205 PM CDT WED MAY 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN VAL VERDE COUNTY
UNTIL 245 PM CDT...

At 204 PM CDT, Doppler radar was tracking a strong thunderstorm over
Langtry, moving northeast at 15 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Langtry and Shumla.

LAT...LON 3012 10148 2990 10106 2974 10140 2975 10142
      2977 10140 2975 10144 2978 10145 2979 10147
      2976 10151 2976 10154 2981 10154 2980 10157
      2977 10157 2977 10158 2981 10163
TIME...MOT...LOC 1904Z 219DEG 11KT 2980 10154

CP
Special weather statement, May 10, 3:01 PM CDT, 1 hour 48 minutes before
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Special weather statement, May 10, 3:29 PM CDT, 1 hour 20 minutes before
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Special weather statement, May 10, 4:02 PM CDT, 47 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
402 PM CDT WED MAY 10 2017

TXZ183-102130-
Val Verde TX-
402 PM CDT WED MAY 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL VAL VERDE COUNTY
UNTIL 430 PM CDT...

At 401 PM CDT, Doppler radar was tracking a strong thunderstorm 10
miles northeast of Shumla, or 16 miles northeast of Langtry, moving
east-northeast at 25 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Bakers Crossing and Devils River State Natural Area.

LAT...LON 2981 10137 2998 10142 3011 10119 2989 10096
TIME...MOT...LOC 2101Z 257DEG 20KT 2992 10131

RUNYEN
Special weather statement, May 10, 4:49 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
449 PM CDT WED MAY 10 2017

TXZ183-102215-
Val Verde TX-
449 PM CDT WED MAY 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN VAL VERDE COUNTY
UNTIL 515 PM CDT...

At 449 PM CDT, Doppler radar was tracking a strong thunderstorm near
Langtry, moving northeast at 25 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Langtry and Shumla.

LAT...LON 3007 10152 2994 10125 2974 10141 2975 10142
      2977 10140 2975 10144 2978 10145 2979 10147
      2976 10151 2976 10154 2981 10154 2980 10157
      2977 10158 2978 10161 2976 10165
TIME...MOT...LOC 2149Z 207DEG 20KT 2977 10153

RUNYEN

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 2:05 PM CDTSpecial Weather StatementEWXVal Verde40 min
May 10, 3:01 PM CDTSpecial Weather StatementEWXVal Verde29 min
May 10, 3:29 PM CDTSpecial Weather StatementEWXVal Verde31 min
May 10, 4:02 PM CDTSpecial Weather StatementEWXVal Verde28 min
May 10, 4:56 PM CDTSevere Thunderstorm WarningEWXVal Verde21 min
May 10, 5:26 PM CDTSpecial Weather StatementEWXVal Verde34 min

Nearby

Special Weather Statements in Texas, 2017Every special weather statement in 2017

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.