Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 2445

November 23, 200441 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 7:17 PM CST for 41 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Nov 23, 2004, 7:17 PM CST (01:17 UTC)
Expired: Nov 23, 2004, 8:15 PM CST
In force: 58 min
Issued by: the Storm Prediction Center

All 41 counties

Angelina County, TX, Austin County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Cherokee County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Madison County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Refugio County, TX, Rusk County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 99 km from the middle of the area, began a volume at 01:21 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.3 hours before the alert went out and 259 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: 1863 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.1

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
Nov 23, 6:23 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bastrop, Bell, Brazos, Burleson and 23 more	2 hr
Nov 23, 7:31 PM CST	Mesoscale Discussion	SPC	Carson, Hansford, Hutchinson, Lipscomb, Moore, Ochiltree and 3 more	5 hr
Nov 23, 7:50 PM CST	Tornado Watch	SPC	Angelina, Austin, Bee, Brazoria, Brazos, Burleson and 34 more	6 hr
Nov 23, 10:01 PM CST	Mesoscale Discussion	SPC	Chambers, Galveston, Jasper, Jefferson, Newton, Orange and 1 more	119 min
Nov 23, 11:00 PM CST	Severe Thunderstorm Watch	SPC	Orange	7 hr

Nearby

Mesoscale Discussions in Texas, 2004 Every mesoscale discussion in 2004

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.