Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 161, NWS San Angelo, TX

September 18, 2011McCulloch County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Sep 18, 2011, 6:00 PM CDT for McCulloch 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 counties it named.

The facts

Issued
Sep 18, 2011, 6:00 PM CDT (23:00 UTC)
Expired
Sep 18, 2011, 6:45 PM CDT
In force
45 min
Issued by
NWS San Angelo, TX
Area
Storm-based polygon

County McCulloch County, TX

The radar

The San Angelo radar (KSJT), 110 km from the middle of the area, began a volume at 23:03 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 18, 4:06 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.0 hours before the alert went out and 249 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 2011-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1433 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 2011-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
1433 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.7

Open this sounding in Storm Lab

The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 17, 7:34 PM CDTSpecial Weather StatementSJTShackelford26 min
Sep 17, 7:41 PM CDTSpecial Weather StatementSJTJones49 min
Sep 17, 8:00 PM CDTSpecial Weather StatementSJTShackelford30 min
Sep 17, 8:23 PM CDTSpecial Weather StatementSJTJones22 min
Sep 17, 8:33 PM CDTSpecial Weather StatementSJTShackelford27 min
Sep 17, 8:48 PM CDTSpecial Weather StatementSJTShackelford27 min
Sep 17, 8:53 PM CDTSpecial Weather StatementSJTJones37 min
Sep 17, 9:36 PM CDTSpecial Weather StatementSJTJones24 min
Sep 17, 10:01 PM CDTSpecial Weather StatementSJTJones29 min
Sep 17, 11:31 PM CDTSpecial Weather StatementSJTShackelford29 min
Sep 18, 3:50 PM CDTSpecial Weather StatementSJTTom Green40 min
Sep 18, 4:44 PM CDTSpecial Weather StatementSJTMcCulloch31 min
Sep 18, 4:49 PM CDTSpecial Weather StatementSJTTom Green56 min
Sep 18, 4:57 PM CDTSpecial Weather StatementSJTRunnels63 min
Sep 18, 5:08 PM CDTSpecial Weather StatementSJTMason37 min
Sep 18, 5:11 PM CDTSpecial Weather StatementSJTKimble34 min
Sep 18, 5:12 PM CDTSpecial Weather StatementSJTRunnels63 min
Sep 18, 5:15 PM CDTSpecial Weather StatementSJTSutton30 min
Sep 18, 5:21 PM CDTSevere Thunderstorm WarningSJTKimble39 min
Sep 18, 5:30 PM CDTSevere Thunderstorm WarningSJTKimble45 min
Sep 18, 5:32 PM CDTSpecial Weather StatementSJTBrown58 min
Sep 18, 5:37 PM CDTSpecial Weather StatementSJTRunnels53 min
Sep 18, 5:42 PM CDTSpecial Weather StatementSJTCallahan63 min
Sep 18, 5:44 PM CDTSpecial Weather StatementSJTMason61 min
Sep 18, 5:50 PM CDTSpecial Weather StatementSJTMcCulloch40 min
Sep 18, 6:08 PM CDTSpecial Weather StatementSJTKimble37 min
Sep 18, 6:26 PM CDTSpecial Weather StatementSJTKimble19 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011

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.