Alert archive / Tennessee / Mesoscale Discussions in 2020

Mesoscale Discussion 375

April 12, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2020, 11:19 PM CDT for 4 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Apr 12, 2020, 11:19 PM CDT (04:19 UTC)
Expired
Apr 13, 2020, 12:45 AM CDT
In force
86 min
Issued by
the Storm Prediction Center
All 47 counties

Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Marion County, AL, Calloway County, KY, Christian County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Marshall County, KY, Trigg County, KY, Alcorn County, MS, Itawamba County, MS, Lee County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Hardeman 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, Lawrence County, TN, Lewis County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Stewart County, TN, Wayne County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 133 km from the middle of the area, began a volume at 04:20 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 (KLZK), launched 00:00Z, 4.3 hours before the alert went out and 163 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 00:00Z on 2020-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2020-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1099 m above ground
0-6 km bulk shear
91 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
96 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
Apr 12, 7:36 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chilton, Choctaw and 16 more84 min
Apr 12, 8:50 PM CDTMesoscale DiscussionSPCBlount, Cullman, Etowah, Jefferson, St. Clair, Shelby and 2 more55 min
Apr 12, 10:28 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 32 more92 min
Apr 12, 10:45 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 26 more8 hr
Apr 12, 7:56 PM CDTMesoscale DiscussionSPCBolivar, Carroll, Coahoma, DeSoto, Grenada, Holmes and 14 more2 hr
Apr 12, 8:19 PM CDTSevere Thunderstorm WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more4 hr
Apr 12, 9:44 PM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 37 more91 min
Apr 12, 7:41 PM CDTMesoscale DiscussionSPCPolk64 min
Apr 12, 7:57 PM CDTTornado WatchSPCBlount, Bradley, McMinn, Monroe, Polk6 hr
Apr 12, 10:17 PM CDTMesoscale DiscussionSPCBlount, Bradley, Cocke, Loudon, McMinn, Meigs and 3 more88 min

Nearby

Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Kentucky, 2020Mesoscale Discussions in Mississippi, 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.