Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 272

March 7, 201718 parishes in Louisiana; 33 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 7, 2017, 11:02 AM CST for 18 parishes in Louisiana; 33 counties in Mississippi. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Mar 7, 2017, 11:02 AM CST (17:02 UTC)
Expired: Mar 7, 2017, 12:00 PM CST
In force: 58 min
Issued by: the Storm Prediction Center

All 51 counties

Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Leake County, MS, Lee County, MS, Lincoln County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Warren County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 88 km from the middle of the area, began a volume at 17:06 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 12:00Z, 5.0 hours before the alert went out and 79 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: 3 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 374 m²/s²
0-3 km storm-relative helicity: 440 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 7, 2:58 AM CST	Mesoscale Discussion	SPC	Claiborne, East Carroll, Lincoln, Morehouse, Ouachita, Union and 2 more	92 min
Mar 7, 3:37 AM CST	Severe Thunderstorm Watch	SPC	Bienville, Claiborne, East Carroll, Jackson, Lincoln, Madison and 6 more	8 hr
Mar 7, 8:03 AM CST	Mesoscale Discussion	SPC	Bienville, Claiborne, East Carroll, Jackson, Lincoln, Madison and 6 more	117 min
Mar 7, 1:40 PM CST	Mesoscale Discussion	SPC	Clarke, Copiah, Covington, Jasper, Jefferson Davis, Jones and 12 more	65 min

Nearby

Mesoscale Discussions in Mississippi, 2017 Mesoscale Discussions in Louisiana, 2017 Every mesoscale discussion in 2017

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.