Alert archive / Tennessee / Mesoscale Discussions in 2020

Mesoscale Discussion 532

May 4, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 4, 2020, 2:02 PM CDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
May 4, 2020, 2:02 PM CDT (19:02 UTC)
Expired
May 4, 2020, 4:00 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 61 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Bedford County, TN, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Giles County, TN, Hardin 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, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Rutherford County, TN, Stewart County, TN, Tipton County, TN, Warren County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

The radar

The Paducah radar (KPAH), 106 km from the middle of the area, began a volume at 19:03 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 (KLZK), launched 12:00Z, 7.0 hours before the alert went out and 189 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 2020-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 404 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 2020-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
404 J/kg
Mixed-layer CIN
-252 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 4, 9:00 AM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 4 more90 min
May 4, 10:38 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Fulton and 12 more97 min
May 4, 12:35 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Cleburne, Fulton, Independence, Izard and 9 more5 hr
May 4, 1:04 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Fulton, Independence, Izard and 8 more86 min
May 4, 1:21 PM CDTMesoscale DiscussionSPCBenton114 min
May 4, 2:32 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more9 hr
May 4, 2:58 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Greene, Mississippi, Poinsett6 hr
May 4, 3:44 PM CDTMesoscale DiscussionSPCClay, Greene, Mississippi, Randolph61 min
May 4, 6:21 PM CDTMesoscale DiscussionSPCMississippi54 min
May 4, 6:42 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 6 more2 hr
May 4, 5:50 AM CDTMesoscale DiscussionSPCBarton, Bates, Cedar, Jasper, Newton, Vernon55 min
May 4, 6:33 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Buchanan, Camden and 40 more12 hr
May 4, 6:42 PM CDTSevere Thunderstorm WatchSPCBedford, Bledsoe, Bradley, Cannon, Cheatham, Coffee and 31 more6 hr

Nearby

Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Arkansas, 2020Every mesoscale discussion in 2020

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.