Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 963

May 13, 20035 counties in Arkansas; 8 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at May 13, 2003, 8:05 PM CDT for 5 counties in Arkansas; 8 parishes in Louisiana. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: May 13, 2003, 8:05 PM CDT (01:05 UTC)
Expired: May 13, 2003, 9:00 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 60 km from the middle of the area, began a volume at 01:06 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

Shreveport, LA (KSHV), launched 00:00Z, 1.1 hours before the alert went out and 51 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: 2326 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 3.2
Supercell composite: 18.5

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
May 14, 5:50 AM CDT	Mesoscale Discussion	SPC	Howard, Little River, Miller, Sevier	115 min
May 14, 10:26 AM CDT	Mesoscale Discussion	SPC	Desha, Phillips	94 min
May 14, 10:55 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	2 hr
May 14, 11:10 AM CDT	Severe Thunderstorm Watch	SPC	Phillips	6 hr
May 14, 2:30 PM CDT	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	6 hr
May 14, 5:17 PM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more	118 min
May 14, 6:10 PM CDT	Severe Thunderstorm Watch	SPC	Ashley, Columbia, Lafayette, Nevada, Union	6 hr
May 13, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 15 more	5 hr
May 13, 10:45 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	5 hr

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Arkansas, 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.