Alert archive / Arkansas / Mesoscale Discussions in 2018

Mesoscale Discussion 853

June 24, 201817 counties in Arkansas; 7 counties in Mississippi; 9 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2018, 2:33 AM CDT for 17 counties in Arkansas; 7 counties in Mississippi; 9 counties in Tennessee. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jun 24, 2018, 2:33 AM CDT (07:33 UTC)
Expired: Jun 24, 2018, 4:00 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 33 counties

Cleburne County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Independence County, AR, Jackson County, AR, Lee County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Chester County, TN, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 76 km from the middle of the area, began a volume at 07:35 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 211Jun 24, 5:30 AM CDT

The nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 7.6 hours before the alert went out and 67 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: 1020 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1488 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
Jun 24, 5:11 AM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Johnson, Logan, Montgomery, Perry and 6 more	79 min
Jun 24, 5:28 AM CDT	Severe Thunderstorm Watch	SPC	Clark, Conway, Crawford, Franklin, Garland, Hempstead and 17 more	4 hr
Jun 24, 7:37 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 47 more	113 min
Jun 24, 4:18 PM CDT	Mesoscale Discussion	SPC	Garland, Howard, Little River, Logan, Montgomery, Perry and 6 more	117 min
Jun 24, 4:53 PM CDT	Severe Thunderstorm Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 22 more	6 hr
Jun 24, 6:39 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Craighead, Cross, Greene, Independence and 6 more	2 hr
Jun 23, 8:23 PM CDT	Mesoscale Discussion	SPC	Giles, Lawrence, Lincoln, Wayne	2 hr
Jun 24, 4:53 PM CDT	Mesoscale Discussion	SPC	Blount, Loudon, Monroe	97 min

Nearby

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