Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 1840

October 10, 2014Catoosa County, Dade County, Georgia; 25 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2014, 2:19 PM EDT for Catoosa County, Dade County, Georgia; 25 counties in Tennessee. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Oct 10, 2014, 2:19 PM EDT (18:19 UTC)
Expired: Oct 10, 2014, 3:45 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 27 counties

Catoosa County, GA, Dade County, GA, Bedford County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Northeast Alabama radar (KHTX), 53 km from the middle of the area, began a volume at 18:18 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 12:00Z, 6.3 hours before the alert went out and 117 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 131 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 10, 5:38 PM EDT	Mesoscale Discussion	SPC	Bartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 5 more	97 min

Nearby

Mesoscale Discussions in Tennessee, 2014 Mesoscale Discussions in Georgia, 2014 Every mesoscale discussion in 2014

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.