Alert archive / Mississippi / Mesoscale Discussions in 2011

Mesoscale Discussion 2329

November 16, 201111 counties in Alabama; 11 parishes in Louisiana; 21 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 16, 2011, 5:33 AM CST for 11 counties in Alabama; 11 parishes in Louisiana; 21 counties in Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Nov 16, 2011, 5:33 AM CST (11:33 UTC)
Expired: Nov 16, 2011, 7:00 AM CST
In force: 87 min
Issued by: the Storm Prediction Center

All 43 counties

Choctaw County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marengo County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Marion County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 117 km from the middle of the area, began a volume at 11:35 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, 11.6 hours before the alert went out and 127 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: 287 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 15, 8:59 PM CST	Mesoscale Discussion	SPC	Mobile, Washington	2 hr
Nov 16, 1:35 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Butler, Calhoun, Chilton and 33 more	115 min
Nov 16, 2:20 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 36 more	8 hr
Nov 16, 7:25 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Calhoun, Chambers and 15 more	95 min
Nov 16, 9:46 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 49 more	7 hr
Nov 16, 9:59 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 31 more	91 min
Nov 16, 12:17 PM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston, Russell	118 min
Nov 16, 12:35 PM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	7 hr
Nov 16, 2:49 AM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 13 more	7 hr

Nearby

Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Alabama, 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; radar from the NEXRAD Level II archive.