Alert archive / Tennessee / Mesoscale Discussions in 2020

Mesoscale Discussion 35

January 11, 202013 counties in Alabama; Catoosa County, Dade County, Walker County, Georgia; 33 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 9:28 AM CST for 13 counties in Alabama; Catoosa County, Dade County, Walker County, Georgia; 33 counties in Tennessee. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jan 11, 2020, 9:28 AM CST (15:28 UTC)
Expired
Jan 11, 2020, 11:00 AM CST
In force
92 min
Issued by
the Storm Prediction Center
All 49 counties

Blount County, AL, Cullman County, AL, DeKalb County, AL, Fayette County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Catoosa County, GA, Dade County, GA, Walker County, GA, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Putnam County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 3.5 hours before the alert went out and 138 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 12:00Z on 2020-01-11Temperature 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, Nashville Metro, TN at 12:00Z on 2020-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 633 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
819 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
633 m²/s²
0-3 km storm-relative helicity
864 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
Jan 11, 6:12 AM CSTMesoscale DiscussionSPCColbert, Lauderdale, Limestone, Madison93 min
Jan 11, 6:57 AM CSTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 7 more7 hr
Jan 11, 7:39 AM CSTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Mobile and 3 more96 min
Jan 11, 7:57 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Chilton and 22 more9 hr
Jan 11, 9:54 AM CSTMesoscale DiscussionSPCChoctaw, Greene, Marengo, Pickens, Sumter, Washington96 min
Jan 11, 11:50 AM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Clarke, Cullman and 15 more85 min
Jan 11, 12:20 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 9 more85 min
Jan 11, 12:42 PM CSTTornado WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 15 more7 hr
Jan 11, 1:15 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Chilton, DeKalb, Etowah and 6 more90 min
Jan 11, 2:26 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Coffee, Covington, Crenshaw and 10 more94 min
Jan 11, 2:44 PM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston5 hr
Jan 11, 3:16 PM CSTMesoscale DiscussionSPCBullock, Chambers, Clay, Cleburne, Lee, Macon and 3 more89 min
Jan 11, 5:21 PM CSTMesoscale DiscussionSPCHouston114 min
Jan 11, 3:48 PM CSTMesoscale DiscussionSPCBanks, Elbert, Franklin, Habersham, Hart, Madison and 2 more117 min
Jan 11, 4:38 PM CSTTornado WatchSPCBaldwin, Bleckley, Burke, Clarke, Columbia, Dodge and 34 more6 hr
Jan 11, 5:36 PM CSTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 63 more84 min
Jan 10, 11:58 PM CSTTornado WatchSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 4 more7 hr
Jan 11, 3:52 AM CSTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Hardeman, Haywood, Lauderdale and 3 more83 min
Jan 11, 4:17 AM CSTTornado WatchSPCBenton, Carroll, Chester, Decatur, Hardeman, Hardin and 5 more6 hr
Jan 11, 5:06 AM CSTMesoscale DiscussionSPCFayette, Hardeman, McNairy54 min
Jan 11, 8:20 AM CSTMesoscale DiscussionSPCBledsoe, Cannon, Clay, Cumberland, DeKalb, Fentress and 11 more55 min

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.