Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 187

March 5, 200320 parishes in Louisiana; 13 counties in Mississippi; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 5, 2003, 11:46 AM CST for 20 parishes in Louisiana; 13 counties in Mississippi; 7 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Mar 5, 2003, 11:46 AM CST (17:46 UTC)
Expired: Mar 5, 2003, 1:45 PM CST
In force: 119 min
Issued by: the Storm Prediction Center

All 40 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Issaquena County, MS, Jefferson County, MS, Lincoln County, MS, Madison County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS, Hardin County, TX, Jasper County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, Tyler County, TX

The watches that followed

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

Tornado Watch 27Mar 5, 2:45 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.8 hours before the alert went out and 285 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 5, 2:45 PM CST	Tornado Watch	SPC	Avoyelles, Catahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana and 10 more	5 hr
Mar 5, 4:49 PM CST	Mesoscale Discussion	SPC	Avoyelles, Catahoula, Concordia, East Carroll, East Feliciana, Franklin and 7 more	86 min
Mar 5, 4:45 PM CST	Tornado Watch	SPC	Clarke, Jones, Lauderdale, Wayne	6 hr
Mar 5, 5:41 PM CST	Mesoscale Discussion	SPC	Kemper	94 min

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Mississippi, 2003 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.