Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1877

October 23, 201524 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 23, 2015, 2:31 PM CDT for 24 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Oct 23, 2015, 2:31 PM CDT (19:31 UTC)
Expired: Oct 23, 2015, 4:30 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 24 counties

Callahan County, TX, Coke County, TX, Coleman County, TX, Eastland County, TX, Erath County, TX, Glasscock County, TX, Hood County, TX, Irion County, TX, Jack County, TX, Jones County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Reagan County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Upton County, TX, Wise County, TX

The radar

The San Angelo radar (KSJT), 90 km from the middle of the area, began a volume at 19:35 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, 7.5 hours before the alert went out and 293 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: 278 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 729 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 22, 8:15 PM CDT	Mesoscale Discussion	SPC	Concho, Crockett, Edwards, Kimble, Menard, Schleicher and 3 more	90 min
Oct 23, 2:32 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Comanche, Concho, Crockett, Edwards and 15 more	118 min

Nearby

Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.