Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 2489

November 28, 2005Concordia Parish, Madison Parish, Tensas Parish, Louisiana; 31 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 28, 2005, 2:40 AM CST for Concordia Parish, Madison Parish, Tensas Parish, Louisiana; 31 counties in Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Nov 28, 2005, 2:40 AM CST (08:40 UTC)
Expired: Nov 28, 2005, 4:15 AM CST
In force: 95 min
Issued by: the Storm Prediction Center

All 34 counties

Concordia Parish, LA, Madison Parish, LA, Tensas Parish, LA, Adams County, MS, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 87 km from the middle of the area, began a volume at 08:40 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

Jackson, MS (KJAN), launched 00:00Z, 8.7 hours before the alert went out and 78 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: 197 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 359 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

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
Nov 27, 11:44 PM CST	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	6 hr
Nov 28, 4:42 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 20 more	93 min
Nov 27, 8:44 PM CST	Mesoscale Discussion	SPC	Benton, DeSoto, Lafayette, Marshall, Panola, Quitman and 1 more	91 min
Nov 27, 11:26 PM CST	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	7 hr
Nov 28, 12:43 AM CST	Mesoscale Discussion	SPC	Coahoma, DeSoto, Panola, Quitman, Tallahatchie, Tate and 1 more	62 min
Nov 28, 3:28 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 12 more	62 min
Nov 28, 9:29 AM CST	Mesoscale Discussion	SPC	Clarke, Forrest, George, Greene, Harrison, Jackson and 11 more	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Louisiana, 2005 Every mesoscale discussion in 2005

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.