Alert archive / Tennessee / Mesoscale Discussions in 2009

Mesoscale Discussion 1995

September 7, 20098 counties in Kentucky; 23 counties in Tennessee; Lee County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2009, 2:15 PM EDT for 8 counties in Kentucky; 23 counties in Tennessee; Lee County, Virginia. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Sep 7, 2009, 2:15 PM EDT (18:15 UTC)
Expired
Sep 7, 2009, 3:45 PM EDT
In force
90 min
Issued by
the Storm Prediction Center
All 32 counties

Bell County, KY, Harlan County, KY, Knott County, KY, Knox County, KY, Leslie County, KY, Letcher County, KY, Perry County, KY, Whitley County, KY, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Campbell County, TN, Claiborne County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Hancock County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Morgan County, TN, Overton County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Union County, TN, Van Buren County, TN, White County, TN, Lee County, VA

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.3 hours before the alert went out and 208 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 2009-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1841 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 12:00Z on 2009-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.1939Sfc1 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
1841 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
673 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

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Nearby

Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Kentucky, 2009Mesoscale Discussions in Virginia, 2009Every mesoscale discussion in 2009

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.