Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 783

May 3, 20085 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2008, 4:04 AM CDT for 5 parishes in Louisiana; 5 counties in Mississippi. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 3, 2008, 4:04 AM CDT (09:04 UTC)
Expired: May 3, 2008, 5:00 AM CDT
In force: 56 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch likely

Counties East Feliciana Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, West Feliciana Parish, LA, Amite County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Pike County, MS

The watches that followed

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

Tornado Watch 258May 3, 4:10 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.1 hours before the alert went out and 143 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: 1673 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 286 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 15.1

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
May 2, 7:09 PM CDT	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Claiborne, East Carroll, Franklin and 15 more	96 min
May 2, 11:04 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 22 more	86 min
May 2, 11:38 PM CDT	Tornado Watch	SPC	Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 11 more	6 hr
May 3, 2:16 AM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 22 more	59 min
May 3, 4:07 AM CDT	Tornado Watch	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 23 more	7 hr
May 3, 7:36 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Iberville, Orleans, Saint Bernard, Saint Charles and 4 more	54 min
May 2, 7:48 PM CDT	Tornado Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Coahoma, DeSoto and 15 more	4 hr

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Mississippi, 2008 Every mesoscale discussion in 2008

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.