Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 551

April 11, 2005Franklin Parish, Madison Parish, Tensas Parish, Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2005, 3:56 AM CDT for Franklin Parish, Madison Parish, Tensas Parish, Louisiana; 16 counties in Mississippi. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2005, 3:56 AM CDT (08:56 UTC)
Expired: Apr 11, 2005, 5:00 AM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Franklin Parish, LA, Madison Parish, LA, Tensas Parish, LA, Attala County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leake County, MS, Madison County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Warren County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 61 km from the middle of the area, began a volume at 09:05 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, 8.9 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1580 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 155 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
Apr 11, 3:12 AM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 6 more	63 min
Apr 11, 3:45 AM CDT	Severe Thunderstorm Watch	SPC	Beauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 12 more	7 hr
Apr 11, 6:53 AM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 12 more	67 min
Apr 11, 9:41 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more	2 hr
Apr 11, 10:15 AM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 25 more	9 hr
Apr 11, 12:12 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more	2 hr
Apr 11, 1:41 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 14 more	2 hr
Apr 11, 2:05 PM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 14 more	7 hr
Apr 11, 6:35 PM CDT	Tornado Watch	SPC	Jefferson, Lafourche, Orleans, Saint Bernard, Saint Charles, Saint Tammany and 1 more	4 hr
Apr 11, 6:52 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 9 more	83 min
Apr 11, 6:17 AM CDT	Mesoscale Discussion	SPC	DeSoto, Tunica	118 min
Apr 11, 1:17 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Coahoma, Itawamba, Lafayette, Lee and 10 more	58 min
Apr 11, 1:35 PM CDT	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 10 more	5 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.