Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 214

April 3, 20189 parishes in Louisiana; 41 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2018, 7:43 PM CDT for 9 parishes in Louisiana; 41 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2018, 7:43 PM CDT (00:43 UTC)
Expired: Apr 3, 2018, 9:15 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 50 counties

Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 60 km from the middle of the area, began a volume at 00:46 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.

Severe Thunderstorm Watch 33Apr 3, 8:10 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 0.7 hours before the alert went out and 50 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: 388 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1866 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 3, 9:14 PM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 1 more	91 min
Apr 3, 11:33 PM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Calcasieu, Cameron, East Baton Rouge, East Feliciana and 14 more	57 min
Apr 3, 7:14 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, Itawamba and 14 more	5 hr
Apr 3, 8:13 PM CDT	Severe Thunderstorm Watch	SPC	Attala, Choctaw, Clarke, Clay, Covington, Jasper and 16 more	3 hr

Nearby

Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Louisiana, 2018 Every mesoscale discussion in 2018

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.