Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 393

March 31, 200722 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 5:30 AM CDT for 22 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 31, 2007, 5:30 AM CDT (10:30 UTC)
Expired: Mar 31, 2007, 7:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Karnes County, TX, Lavaca County, TX, Live Oak County, TX, Matagorda County, TX, Refugio County, TX, Victoria County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 147 km from the middle of the area, began a volume at 10:33 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 00:00Z, 10.5 hours before the alert went out and 158 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: 294 J/kg
Mixed-layer CIN: -219 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
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
Mar 30, 7:38 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 74 more	2 hr
Mar 30, 9:48 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 49 more	117 min
Mar 30, 10:06 PM CDT	Mesoscale Discussion	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 16 more	84 min
Mar 30, 10:28 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more	8 hr
Mar 30, 11:53 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 45 more	67 min
Mar 31, 2:12 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 32 more	93 min
Mar 31, 2:40 AM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Cherokee, Gregg, Harrison, Marion and 2 more	95 min
Mar 31, 3:17 AM CDT	Tornado Watch	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 17 more	7 hr
Mar 31, 7:08 AM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 14 more	67 min
Mar 31, 8:40 AM CDT	Severe Thunderstorm Watch	SPC	Jasper, Newton, Orange, Sabine, San Augustine	5 hr

Nearby

Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.