Alert archive / Tennessee / Mesoscale Discussions in 2018

Mesoscale Discussion 599

May 31, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 5:46 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 31, 2018, 5:46 PM CDT (22:46 UTC)
Expired
May 31, 2018, 8:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 43 counties

Clay County, AR, Cleburne County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Stone County, AR, Fulton County, KY, Dunklin County, MO, Pemiscot County, MO, Benton County, TN, Carroll County, TN, Cheatham County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Stewart County, TN, Weakley County, TN, Williamson County, TN

The radar

The Memphis radar (KNQA), 77 km from the middle of the area, began a volume at 22:49 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.

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 10.8 hours before the alert went out and 133 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-pSkew-T log-p diagram, Little Rock, AR at 12:00Z on 2018-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1378 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2018-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -96 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1378 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
988 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-96 m²/s²
0-3 km storm-relative helicity
-96 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.

IssuedProductOfficeCountiesLasted
May 31, 2:59 AM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 3 more61 min
May 31, 12:24 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clay, Fulton and 4 more96 min
May 31, 1:57 PM CDTTornado WatchSPCClay, Greene, Lawrence, Randolph6 hr
May 31, 4:42 PM CDTMesoscale DiscussionSPCClay, Randolph2 hr
May 31, 10:16 AM CDTMesoscale DiscussionSPCDaviess, Hancock, Henderson, Union119 min
May 31, 10:31 AM CDTSevere Thunderstorm WatchSPCAnderson, Bourbon, Boyle, Breckinridge, Bullitt, Casey and 35 more6 hr
May 31, 11:26 AM CDTMesoscale DiscussionSPCAnderson, Bath, Bell, Bourbon, Boyle, Breathitt and 39 more64 min
May 31, 1:05 PM CDTMesoscale DiscussionSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 25 more85 min
May 31, 1:30 PM CDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more3 hr
May 31, 2:29 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Clinton, Cumberland, Edmonson and 9 more91 min
May 31, 2:56 PM CDTMesoscale DiscussionSPCAnderson, Bath, Bourbon, Boyle, Bracken, Breathitt and 37 more64 min
May 31, 3:27 PM CDTMesoscale DiscussionSPCBell, Clinton, Harlan, Knox, Leslie, Letcher and 3 more93 min
May 31, 3:44 PM CDTMesoscale DiscussionSPCBracken, Lewis, Mason91 min
May 31, 4:31 PM CDTMesoscale DiscussionSPCBell, Clinton, Cumberland, McCreary, Russell, Wayne and 1 more59 min

Nearby

Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Missouri, 2018Every 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.