Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 186

February 21, 201319 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2013, 7:22 AM CST for 19 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Feb 21, 2013, 7:22 AM CST (13:22 UTC)
Expired: Feb 21, 2013, 8:45 AM CST
In force: 83 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bell County, TX, Brazos County, TX, Burleson County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Polk County, TX, Robertson County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX

The radar

The Ft Hood radar (KGRK), 127 km from the middle of the area, began a volume at 13:23 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, 1.4 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 915 m²/s²
0-3 km storm-relative helicity: 1096 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

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
Feb 20, 10:52 PM CST	Mesoscale Discussion	SPC	Archer, Baylor, Brown, Callahan, Childress, Clay and 30 more	113 min
Feb 20, 11:49 PM CST	Mesoscale Discussion	SPC	Gray, Hemphill, Lipscomb, Ochiltree, Roberts, Wheeler	6 hr
Feb 21, 3:19 AM CST	Mesoscale Discussion	SPC	Concho, Gillespie, Kimble, Llano, McCulloch, Mason and 3 more	86 min
Feb 21, 5:08 AM CST	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Clay, Comanche, Cooke and 16 more	97 min
Feb 21, 10:53 AM CST	Mesoscale Discussion	SPC	Angelina, Chambers, Hardin, Harris, Jasper, Jefferson and 6 more	97 min
Feb 21, 1:37 PM CST	Tornado Watch	SPC	Hardin, Jasper, Newton, Orange, Sabine, Tyler	5 hr

Nearby

Mesoscale Discussions in Texas, 2013 Every 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.