Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 1810

July 13, 200316 parishes in Louisiana; 18 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 1:41 PM CDT for 16 parishes in Louisiana; 18 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 13, 2003, 1:41 PM CDT (18:41 UTC)
Expired: Jul 13, 2003, 3:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 34 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Camp County, TX, Cass County, TX, Delta County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rains County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The watches that followed

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

Severe Thunderstorm Watch 737Jul 13, 1:55 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.7 hours before the alert went out and 61 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: 1819 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jul 13, 11:02 AM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Franklin, LaSalle, Madison and 4 more	118 min
Jul 13, 1:55 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more	5 hr
Jul 13, 4:33 PM CDT	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Concordia, De Soto, Franklin and 10 more	87 min

Nearby

Mesoscale Discussions in Texas, 2003 Mesoscale Discussions in Louisiana, 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.