Alert archive / Tennessee / Mesoscale Discussions in 2020

Mesoscale Discussion 83

February 5, 2020Jackson County, Limestone County, Madison County, Alabama; Catoosa County, Dade County, Georgia; 18 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Feb 5, 2020, 6:33 PM CST for Jackson County, Limestone County, Madison County, Alabama; Catoosa County, Dade County, Georgia; 18 counties in Tennessee. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Feb 5, 2020, 6:33 PM CST (00:33 UTC)
Expired
Feb 5, 2020, 8:30 PM CST
In force
117 min
Issued by
the Storm Prediction Center
All 23 counties

Jackson County, AL, Limestone County, AL, Madison County, AL, Catoosa County, GA, Dade County, GA, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Meigs County, TN, Moore County, TN, Rhea County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN

The radar

The Northeast Alabama radar (KHTX), 29 km from the middle of the area, began a volume at 00:35 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 0.6 hours before the alert went out and 113 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, Nashville Metro, TN at 00:00Z on 2020-02-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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, Nashville Metro, TN at 00:00Z on 2020-02-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 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
47 J/kg
Mixed-layer CIN
-159 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
207 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
Feb 5, 9:43 PM CSTMesoscale DiscussionSPCChoctaw, Greene, Hale, Marengo, Perry, Pickens and 2 more2 hr
Feb 5, 11:15 PM CSTMesoscale DiscussionSPCBibb, Chilton, Choctaw, Clarke, Dallas, Greene and 9 more2 hr
Feb 5, 11:48 PM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Calhoun, Cherokee, Chilton and 18 more8 hr
Feb 6, 2:02 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 18 more88 min
Feb 6, 3:27 AM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 20 more9 hr
Feb 6, 4:33 AM CSTMesoscale DiscussionSPCChilton, Clarke, Dallas, Monroe, Perry, Washington and 1 more87 min
Feb 6, 6:40 AM CSTMesoscale DiscussionSPCChambers, Clay, Cleburne, Coosa, Elmore, Randolph and 2 more95 min
Feb 6, 10:00 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 9 more2 hr
Feb 6, 11:17 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston8 hr
Feb 6, 8:50 AM CSTMesoscale DiscussionSPCClarke, Columbia, Elbert, Greene, Hart, Lincoln and 6 more55 min
Feb 6, 9:12 AM CSTTornado WatchSPCBaldwin, Banks, Barrow, Clarke, Columbia, Elbert and 21 more7 hr
Feb 6, 10:45 AM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 57 more90 min
Feb 6, 1:32 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 71 more58 min
Feb 6, 3:29 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 48 more2 hr
Feb 6, 4:30 PM CSTTornado WatchSPCAppling, Atkinson, Bacon, Brantley, Bryan, Camden and 14 more7 hr

Nearby

Mesoscale Discussions in Tennessee, 2020Mesoscale Discussions in Alabama, 2020Mesoscale Discussions in Georgia, 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.