Alert archive / Mississippi / Mesoscale Discussions in 2019

Mesoscale Discussion 140

March 3, 2019Choctaw County, Sumter County, Alabama; 18 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 3, 2019, 9:13 AM CST for Choctaw County, Sumter County, Alabama; 18 counties in Mississippi. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Mar 3, 2019, 9:13 AM CST (15:13 UTC)
Expired: Mar 3, 2019, 10:15 AM CST
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Choctaw County, AL, Sumter County, AL, Amite County, MS, Clarke County, MS, Covington County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Newton County, MS, Pike County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wayne County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 76 km from the middle of the area, began a volume at 15:17 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 7Mar 3, 11:40 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 3.2 hours before the alert went out and 86 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 285 m²/s²
0-3 km storm-relative helicity: 413 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 3, 9:59 AM CST	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Chambers, Chilton and 23 more	2 hr
Mar 3, 11:03 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 25 more	7 hr
Mar 3, 11:24 AM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	10 hr
Mar 3, 12:02 PM CST	Mesoscale Discussion	SPC	Dale, Geneva, Henry, Houston	58 min
Mar 3, 12:28 PM CST	Mesoscale Discussion	SPC	Lee, Russell	32 min
Mar 3, 1:00 PM CST	Mesoscale Discussion	SPC	Macon, Montgomery	30 min
Mar 3, 1:20 PM CST	Mesoscale Discussion	SPC	Baldwin, Bullock, Butler, Clarke, Coffee, Conecuh and 13 more	115 min
Mar 3, 2:06 PM CST	Mesoscale Discussion	SPC	Lee, Macon, Russell	54 min
Mar 3, 3:22 PM CST	Mesoscale Discussion	SPC	Coffee, Dale, Geneva, Henry, Houston	113 min
Mar 3, 5:15 PM CST	Mesoscale Discussion	SPC	Houston	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2019 Mesoscale Discussions in Alabama, 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.