Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 130

February 23, 20165 counties in Alabama; Saint Tammany Parish, Louisiana; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2016, 5:18 PM CST for 5 counties in Alabama; Saint Tammany Parish, Louisiana; 10 counties in Mississippi. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Feb 23, 2016, 5:18 PM CST (23:18 UTC)
Expired: Feb 23, 2016, 7:15 PM CST
In force: 117 min
Issued by: the Storm Prediction Center

Counties Choctaw County, AL, Clarke County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Saint Tammany Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 70 km from the middle of the area, began a volume at 23:18 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 watches that followed

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.3 hours before the alert went out and 129 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: 42 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 23, 1:15 PM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Escambia and 5 more	2 hr
Feb 23, 2:13 PM CST	Tornado Watch PDS	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	8 hr
Feb 23, 4:29 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Coffee, Covington, Crenshaw and 3 more	61 min
Feb 23, 5:35 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Clay, Coosa, Dallas and 9 more	115 min
Feb 23, 5:53 PM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 21 more	6 hr
Feb 23, 10:44 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 13 more	91 min
Feb 23, 11:08 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 23 more	7 hr
Feb 23, 12:25 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	65 min
Feb 23, 3:08 PM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more	97 min
Feb 23, 2:20 PM CST	Tornado Watch	SPC	Adams, Attala, Carroll, Choctaw, Claiborne, Clay and 26 more	6 hr
Feb 23, 3:30 PM CST	Mesoscale Discussion	SPC	Claiborne, Copiah, Hinds, Madison, Rankin, Yazoo	90 min

Nearby

Mesoscale Discussions in Mississippi, 2016 Mesoscale Discussions in Alabama, 2016 Mesoscale Discussions in Louisiana, 2016 Every mesoscale discussion in 2016

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.