Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 2056

October 14, 201222 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2012, 1:16 AM CDT for 22 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Oct 14, 2012, 1:16 AM CDT (06:16 UTC)
Expired: Oct 14, 2012, 2:45 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 22 counties

Bell County, TX, Bosque County, TX, Burnet County, TX, Coryell County, TX, Dallas County, TX, Ellis County, TX, Hamilton County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, McLennan County, TX, Mills County, TX, Navarro County, TX, Rains County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Van Zandt County, TX, Williamson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 75 km from the middle of the area, began a volume at 06:20 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

Fort Worth, TX (KFWD), launched 00:00Z, 6.3 hours before the alert went out and 104 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1344 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 324 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 17.2

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.

Issued	Product	Office	Counties	Lasted
Oct 13, 8:02 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Bosque, Brown, Burnet and 33 more	88 min
Oct 13, 9:37 PM CDT	Mesoscale Discussion	SPC	Bowie, Delta, Fannin, Grayson, Lamar, Red River	113 min
Oct 13, 10:15 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Fannin, Lamar, Red River	6 hr

Nearby

Mesoscale Discussions in Texas, 2012 Every mesoscale discussion in 2012

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.