Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 75

February 5, 202010 parishes in Louisiana; 25 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2020, 10:28 AM CST for 10 parishes in Louisiana; 25 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Feb 5, 2020, 10:28 AM CST (16:28 UTC)
Expired: Feb 5, 2020, 12:00 PM CST
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 35 counties

Allen Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Rapides Parish, LA, Tensas Parish, LA, West Feliciana Parish, LA, Adams County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Jefferson County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Warren County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 64 km from the middle of the area, began a volume at 16:29 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.

Tornado Watch 22Feb 5, 11:50 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.5 hours before the alert went out and 57 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: 788 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 3.6

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 5, 11:16 AM CST	Mesoscale Discussion	SPC	Orleans, Saint Bernard, Saint Charles, Saint Tammany	119 min
Feb 5, 11:49 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 24 more	6 hr
Feb 5, 1:19 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 9 more	86 min
Feb 5, 1:39 PM CST	Mesoscale Discussion	SPC	Catahoula, Concordia, Madison, Tensas	96 min
Feb 5, 3:41 PM CST	Mesoscale Discussion	SPC	Concordia, East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, Tensas and 2 more	64 min
Feb 5, 3:47 PM CST	Mesoscale Discussion	SPC	Itawamba, Monroe, Prentiss, Tishomingo	118 min
Feb 5, 4:25 PM CST	Tornado Watch	SPC	Alcorn, Calhoun, Chickasaw, Itawamba, Lee, Monroe and 4 more	5 hr
Feb 5, 5:06 PM CST	Mesoscale Discussion	SPC	Amite, Clarke, Clay, Copiah, Covington, Forrest and 27 more	84 min
Feb 5, 5:50 PM CST	Tornado Watch	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 19 more	6 hr

Nearby

Mesoscale Discussions in Mississippi, 2020 Mesoscale Discussions in Louisiana, 2020 Every mesoscale discussion in 2020

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.