Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 235

March 18, 201613 parishes in Louisiana; Hancock County, Harrison County, Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2016, 10:40 AM CDT for 13 parishes in Louisiana; Hancock County, Harrison County, Jackson County, Mississippi. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Mar 18, 2016, 10:40 AM CDT (15:40 UTC)
Expired: Mar 18, 2016, 12:15 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Ascension Parish, LA, Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.7 hours before the alert went out and 86 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: 585 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Mar 18, 9:51 AM CDT	Mesoscale Discussion	SPC	Webster	84 min
Mar 18, 1:16 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more	59 min
Mar 18, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 12 more	6 hr
Mar 18, 3:47 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 15 more	118 min

Nearby

Mesoscale Discussions in Louisiana, 2016 Mesoscale Discussions in Mississippi, 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.