Alert archive / Louisiana / Mesoscale Discussions in 2019

Mesoscale Discussion 593

May 8, 20198 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 8, 2019, 7:02 PM CDT for 8 parishes in Louisiana; 7 counties in Mississippi. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: May 8, 2019, 7:02 PM CDT (00:02 UTC)
Expired: May 8, 2019, 8:00 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Claiborne County, MS, Hinds County, MS, Issaquena County, MS, Madison County, MS, Sharkey County, MS, Warren County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 114 km from the middle of the area, began a volume at 00:04 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, 0.0 hours before the alert went out and 104 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: 787 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

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
May 8, 10:31 PM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 13 more	89 min
May 9, 6:58 AM CDT	Mesoscale Discussion	SPC	Catahoula, Franklin, Grant, LaSalle, Madison, Rapides and 1 more	62 min
May 9, 11:22 AM CDT	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa, Washington and 1 more	113 min
May 9, 11:46 AM CDT	Tornado Watch	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more	6 hr
May 9, 1:34 PM CDT	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 3 more	116 min
May 9, 3:35 PM CDT	Mesoscale Discussion	SPC	Ascension, Livingston, Saint John the Baptist, Saint Tammany	115 min
May 8, 9:28 PM CDT	Mesoscale Discussion	SPC	Attala, Carroll, Copiah, Grenada, Hinds, Holmes and 12 more	62 min
May 9, 8:09 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Attala, Claiborne, Clarke, Copiah, Covington and 20 more	6 hr

Nearby

Mesoscale Discussions in Louisiana, 2019 Mesoscale Discussions in Mississippi, 2019 Every mesoscale discussion in 2019

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.