Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 1138

July 4, 20167 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2016, 11:45 PM CDT for 7 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2016, 11:45 PM CDT (04:45 UTC)
Expired: Jul 5, 2016, 1:15 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Bosque County, TX, Comanche County, TX, Erath County, TX, Hood County, TX, Johnson County, TX, Somervell County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 67 km from the middle of the area, began a volume at 04:46 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, 4.8 hours before the alert went out and 86 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: 2633 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1343 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 18.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 11:14 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 13 more	2 hr
Jul 5, 5:19 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Erath, Foard, Hardeman and 15 more	2 hr
Jul 5, 3:08 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Coke, Crosby, Dawson, Ector and 16 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.