Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 1468

July 14, 20124 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2012, 6:00 PM CDT for 4 counties in Oklahoma; 25 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2012, 6:00 PM CDT (23:00 UTC)
Expired: Jul 14, 2012, 7:00 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 29 counties

Bryan County, OK, Carter County, OK, Love County, OK, Marshall County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 83 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.0 hours before the alert went out and 58 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: 1732 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 679 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.5

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
Jul 14, 2:46 PM CDT	Mesoscale Discussion	SPC	Atoka, Coal, Creek, Haskell, Hughes, Johnston and 12 more	59 min

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Oklahoma, 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.