Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 149

February 11, 201315 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2013, 2:18 AM CST for 15 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Feb 11, 2013, 2:18 AM CST (08:18 UTC)
Expired
Feb 11, 2013, 3:45 AM CST
In force
87 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Atascosa County, TX, Bee County, TX, DeWitt County, TX, Duval County, TX, Goliad County, TX, Jackson County, TX, Karnes County, TX, La Salle County, TX, Lavaca County, TX, Live Oak County, TX, McMullen County, TX, Refugio County, TX, Victoria County, TX, Webb County, TX, Wharton County, TX

The radar

The Corpus Christi radar (KCRP), 105 km from the middle of the area, began a volume at 08:20 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, 8.3 hours before the alert went out and 121 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 2013-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 19 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 2013-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 square meters per square second.1939587897117Sfc1 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
19 J/kg
Mixed-layer CIN
-635 J/kg
Mixed-layer LCL
897 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 11, 1:01 PM CSTMesoscale DiscussionSPCJasper, Newton, Tyler89 min

Nearby

Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013

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.