Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Austin/San Antonio, TX

April 30, 2017Wilson County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Apr 30, 2017, 2:30 AM CDT for Wilson 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 30, 2017, 2:30 AM CDT (07:30 UTC)
Expired
Apr 30, 2017, 3:15 AM CDT
In force
45 min
Issued by
NWS Austin/San Antonio, TX

County Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 56 km from the middle of the area, began a volume at 07:31 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

Corpus Christi, TX (KCRP), launched 00:00Z, 7.5 hours before the alert went out and 175 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, Corpus Christi, TX at 00:00Z on 2017-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4355 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, Corpus Christi, TX at 00:00Z on 2017-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 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
4355 J/kg
Mixed-layer CIN
-249 J/kg
Mixed-layer LCL
1127 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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 Apr 30, 1:27 AM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Apr 30, 1:27 AM CDT, 1 hour 3 minutes before
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Hazardous weather outlook, Apr 29, 11:41 PM CDT, 2 hours 49 minutes before
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In the hours before

Special weather statement, Apr 29, 8:54 PM CDT, 5 hours 36 minutes before
Special Weather Statement
National Weather Service Austin/San Antonio TX
854 PM CDT SAT APR 29 2017

TXZ220>222-300245-
Karnes TX-Atascosa TX-Wilson TX-
854 PM CDT SAT APR 29 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN KARNES...EASTERN
ATASCOSA AND WILSON COUNTIES UNTIL 945 PM CDT...

At 853 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from the Wilson and Bexar County line near
Elmendorf south toward the southern border of central Atascosa
County north of Cross, moving northeast at 30 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Pleasanton, Floresville, Poth, Stockdale, Christine, Campbellton, La
Vernia, Falls City, Sutherland Springs, Canada Verde, Fashing,
Coughran, Hobson, Peggy, Deweesville, McCoy and Graytown.

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

LAT...LON 2864 9834 2864 9861 2909 9842 2935 9820
      2938 9812 2936 9811 2938 9809 2937 9785
      2876 9807 2879 9810 2862 9833
TIME...MOT...LOC 0153Z 246DEG 24KT 2931 9826 2869 9853

BMW
Special weather statement, Apr 29, 9:45 PM CDT, 4 hours 45 minutes before
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Special weather statement, Apr 29, 10:22 PM CDT, 4 hours 8 minutes before
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Special weather statement, Apr 30, 2:30 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 7:56 PM CDTSpecial Weather StatementEWXCaldwell, Guadalupe49 min
Apr 29, 8:27 PM CDTSpecial Weather StatementEWXWilson33 min
Apr 29, 8:54 PM CDTSpecial Weather StatementEWXWilson51 min
Apr 29, 9:17 PM CDTWind AdvisoryEWXAtascosa, Bandera, Bexar, Blanco, Burnet, Caldwell and 18 more4 hr
Apr 29, 9:24 PM CDTSevere Thunderstorm WarningEWXAtascosa, Karnes, Wilson51 min
Apr 29, 9:45 PM CDTSpecial Weather StatementEWXKarnes45 min
Apr 29, 10:22 PM CDTSpecial Weather StatementEWXKarnes38 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.