Alert archive / Tennessee / Mesoscale Discussions in 2018

Mesoscale Discussion 605

June 1, 20184 counties in Alabama; 7 counties in Mississippi; 21 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2018, 2:41 AM CDT for 4 counties in Alabama; 7 counties in Mississippi; 21 counties in Tennessee. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2018, 2:41 AM CDT (07:41 UTC)
Expired: Jun 1, 2018, 3:15 AM CDT
In force: 34 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 32 counties

Colbert County, AL, Lauderdale County, AL, Limestone County, AL, Madison County, AL, Alcorn County, MS, Benton County, MS, Marshall County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Bedford County, TN, Chester County, TN, Coffee County, TN, Decatur County, TN, Fayette County, TN, Franklin County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Rutherford County, TN, Wayne County, TN, Williamson County, TN

The radar

The Columbus AFB radar (KGWX), 140 km from the middle of the area, began a volume at 07:42 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

Little Rock, AR (KBYH), launched 00:00Z, 7.7 hours before the alert went out and 172 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: 1087 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1560 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

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 1, 12:25 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 22 more	3 hr
Jun 1, 1:29 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 22 more	5 hr
Jun 1, 4:38 PM CDT	Mesoscale Discussion	SPC	Chambers, Lee, Russell, Tallapoosa	2 hr
May 31, 7:37 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crockett, Dyer, Gibson, Henry and 8 more	113 min
May 31, 7:56 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	7 hr
May 31, 11:49 PM CDT	Mesoscale Discussion	SPC	Crockett, Dyer, Gibson, Haywood, Henry, Lake and 4 more	116 min

Nearby

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