Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 187

March 16, 201416 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 16, 2014, 1:42 AM CDT for 16 parishes in Louisiana; 6 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 16, 2014, 1:42 AM CDT (06:42 UTC)
Expired: Mar 16, 2014, 3:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 22 counties

Ascension Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Hancock County, MS, Pearl River County, MS, Pike County, MS, Stone County, MS, Walthall County, MS

The watches that followed

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

Tornado Watch 30Mar 16, 4:55 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.7 hours before the alert went out and 64 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: 72 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Mar 16, 4:20 AM CDT	Mesoscale Discussion	SPC	Tangipahoa, Washington	115 min
Mar 16, 4:51 AM CDT	Tornado Watch	SPC	Saint Tammany, Tangipahoa, Washington	7 hr
Mar 16, 5:46 AM CDT	Mesoscale Discussion	SPC	Beauregard, Sabine, Vernon	119 min
Mar 16, 6:31 AM CDT	Mesoscale Discussion	SPC	George, Greene, Harrison, Jackson, Pearl River, Perry and 1 more	89 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.