Alert archive / Mississippi / Mesoscale Discussions in 2018

Mesoscale Discussion 631

June 3, 2018Lamar County, Alabama; Phillips County, Arkansas; 42 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2018, 1:32 AM CDT for Lamar County, Alabama; Phillips County, Arkansas; 42 counties in Mississippi. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 3, 2018, 1:32 AM CDT (06:32 UTC)
Expired: Jun 3, 2018, 3:30 AM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 44 counties

Lamar County, AL, Phillips County, AR, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Lafayette County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Union 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), 135 km from the middle of the area, began a volume at 06:33 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 152Jun 3, 1:55 AM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 6.5 hours before the alert went out and 130 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: 1960 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1396 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

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
Jun 3, 1:55 AM CDT	Severe Thunderstorm Watch	SPC	Greene, Pickens, Sumter	4 hr
Jun 3, 3:54 AM CDT	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Greene, Lamar, Lauderdale and 3 more	66 min
Jun 3, 2:24 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 27 more	66 min
Jun 2, 9:05 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more	55 min
Jun 3, 3:49 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Clarke, Covington, Forrest, Franklin and 20 more	56 min

Nearby

Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Alabama, 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.