Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 988

May 26, 2011Orleans Parish, Saint Bernard Parish, Saint Tammany Parish, Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 5:18 PM CDT for Orleans Parish, Saint Bernard Parish, Saint Tammany Parish, Louisiana; 6 counties in Mississippi. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 26, 2011, 5:18 PM CDT (22:18 UTC)
Expired: May 26, 2011, 6:15 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Orleans Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.3 hours before the alert went out and 39 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: 3259 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 464 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.8

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 25, 7:22 PM CDT	Mesoscale Discussion	SPC	Union	53 min
May 25, 7:45 PM CDT	Mesoscale Discussion	SPC	Bienville, Caldwell, De Soto, Grant, Jackson, Lincoln and 9 more	60 min
May 25, 9:43 PM CDT	Tornado Watch	SPC	Avoyelles, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more	5 hr
May 26, 2:05 AM CDT	Mesoscale Discussion	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Orleans and 10 more	85 min
May 25, 8:33 PM CDT	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, DeSoto, Itawamba and 14 more	7 hr
May 25, 10:27 PM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 14 more	2 hr
May 26, 7:56 AM CDT	Mesoscale Discussion	SPC	Lowndes	94 min
May 26, 12:22 PM CDT	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, George, Greene, Jasper and 6 more	83 min

Nearby

Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Louisiana, 2011 Every mesoscale discussion in 2011

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.