Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 408

April 2, 201711 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2017, 4:23 PM CDT for 11 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 2, 2017, 4:23 PM CDT (21:23 UTC)
Expired: Apr 2, 2017, 7:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Aransas County, TX, Brazoria County, TX, Calhoun County, TX, Cameron County, TX, Jackson County, TX, Kenedy County, TX, Kleberg County, TX, Matagorda County, TX, Nueces County, TX, Refugio County, TX, Willacy County, TX

The radar

The Corpus Christi radar (KCRP), 64 km from the middle of the area, began a volume at 21:27 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

Corpus Christi, TX (KCRP), launched 12:00Z, 9.4 hours before the alert went out and 48 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: 3410 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 3.7
Supercell composite: 20.1

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
Apr 1, 7:20 PM CDT	Mesoscale Discussion	SPC	Val Verde	85 min
Apr 1, 8:44 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 5 more	61 min
Apr 1, 10:06 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Comal, Edwards, Gillespie and 9 more	114 min
Apr 1, 10:28 PM CDT	Tornado Watch	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more	8 hr
Apr 2, 2:53 AM CDT	Mesoscale Discussion	SPC	Bandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more	82 min
Apr 2, 5:16 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Bandera, Bastrop, Bell, Bexar and 51 more	119 min
Apr 2, 6:00 AM CDT	Tornado Watch	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 51 more	7 hr
Apr 2, 9:04 AM CDT	Mesoscale Discussion	SPC	Angelina, Houston, Jasper, Montgomery, Nacogdoches, Newton and 8 more	2 hr
Apr 2, 9:44 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Cherokee and 19 more	2 hr
Apr 2, 10:39 AM CDT	Tornado Watch	SPC	Angelina, Austin, Cherokee, Colorado, Gregg, Hardin and 20 more	5 hr
Apr 2, 12:22 PM CDT	Mesoscale Discussion	SPC	Angelina, Nacogdoches, Sabine, San Augustine, Shelby, Trinity	83 min
Apr 2, 1:34 PM CDT	Tornado Watch PDS	SPC	Angelina, Hardin, Jasper, Nacogdoches, Newton, Orange and 4 more	7 hr
Apr 2, 2:06 PM CDT	Mesoscale Discussion	SPC	Sabine	54 min
Apr 2, 5:54 PM CDT	Mesoscale Discussion	SPC	Hardin, Jasper, Newton, Orange	96 min

Nearby

Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.