Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 116

March 10, 20186 counties in Arkansas; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 10, 2018, 10:44 PM CST for 6 counties in Arkansas; 30 counties in Mississippi. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Mar 10, 2018, 10:44 PM CST (04:44 UTC)
Expired: Mar 11, 2018, 12:15 AM CST
In force: 91 min
Issued by: the Storm Prediction Center

All 36 counties

Arkansas County, AR, Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Choctaw County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Quitman County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 146 km from the middle of the area, began a volume at 04:46 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 nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 4.7 hours before the alert went out and 140 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: 54 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1700 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 108 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
Mar 10, 8:06 PM CST	Mesoscale Discussion	SPC	Arkansas, Chicot, Clark, Cleveland, Conway, Crawford and 27 more	114 min
Mar 10, 8:33 PM CST	Severe Thunderstorm Watch	SPC	Ashley, Chicot	7 hr
Mar 10, 10:08 PM CST	Mesoscale Discussion	SPC	Lafayette, Miller	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Arkansas, 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.