Alert archive / Louisiana / Mesoscale Discussions in 2022

Mesoscale Discussion 407

April 5, 20228 parishes in Louisiana; Pearl River County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2022, 10:30 AM CDT for 8 parishes in Louisiana; Pearl River County, Mississippi. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 5, 2022, 10:30 AM CDT (15:30 UTC)
Expired: Apr 5, 2022, 11:30 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 94

Counties East Baton Rouge Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.5 hours before the alert went out and 92 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: 1238 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 272 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 8.9

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
Apr 4, 10:51 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more	5 hr
Apr 5, 1:47 AM CDT	Mesoscale Discussion	SPC	Avoyelles, Caldwell, Catahoula, Concordia, East Baton Rouge, East Carroll and 16 more	2 hr
Apr 5, 3:18 AM CDT	Tornado Watch	SPC	Ascension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 41 more	8 hr
Apr 5, 6:27 AM CDT	Mesoscale Discussion	SPC	Forrest, George, Greene, Harrison, Jackson, Perry and 2 more	3 hr
Apr 5, 6:51 AM CDT	Tornado Watch	SPC	George, Greene, Harrison, Jackson, Perry, Stone and 1 more	8 hr
Apr 5, 8:45 AM CDT	Mesoscale Discussion	SPC	Forrest, George, Greene, Lamar, Marion, Perry and 2 more	90 min

Nearby

Mesoscale Discussions in Louisiana, 2022 Mesoscale Discussions in Mississippi, 2022 Every mesoscale discussion in 2022

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.