Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2327

August 31, 200321 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2003, 10:11 AM CDT for 21 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 31, 2003, 10:11 AM CDT (15:11 UTC)
Expired: Aug 31, 2003, 3:15 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 21 counties

Angelina County, TX, Brazos County, TX, Chambers County, TX, Cherokee County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, Robertson County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 121 km from the middle of the area, began a volume at 15:11 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.2 hours before the alert went out and 192 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: 659 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.0

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
Aug 31, 12:12 PM CDT	Mesoscale Discussion	SPC	Angelina, Hardin, Jasper, Newton, Polk, Sabine and 3 more	3 hr
Aug 31, 6:16 PM CDT	Mesoscale Discussion	SPC	Clay, Jack, Montague, Palo Pinto	2 hr

Nearby

Mesoscale Discussions in Texas, 2003 Every mesoscale discussion in 2003

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.