Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 556

April 19, 20068 counties in Kentucky; 14 counties in Tennessee; Lee County, Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2006, 3:02 AM EDT for 8 counties in Kentucky; 14 counties in Tennessee; Lee County, Virginia. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2006, 3:02 AM EDT (07:02 UTC)
Expired: Apr 19, 2006, 5:00 AM EDT
In force: 118 min
Issued by: the Storm Prediction Center

All 23 counties

Bell County, KY, Clay County, KY, Harlan County, KY, Knox County, KY, Laurel County, KY, McCreary County, KY, Pulaski County, KY, Whitley County, KY, Anderson County, TN, Blount County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Sevier County, TN, Union County, TN, Lee County, VA

The radar

The Knoxville radar (KMRX), 35 km from the middle of the area, began a volume at 07:02 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 watches that followed

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

Severe Thunderstorm Watch 206Apr 19, 3:40 AM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 7.0 hours before the alert went out and 335 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2039 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 19, 1:50 AM EDT	Severe Thunderstorm Watch	SPC	Anderson, Bourbon, Boyle, Breckinridge, Bullitt, Carroll and 29 more	6 hr
Apr 19, 2:29 AM EDT	Tornado Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more	4 hr
Apr 19, 3:39 AM EDT	Severe Thunderstorm Watch	SPC	Bath, Bell, Breathitt, Clay, Estill, Harlan and 20 more	7 hr
Apr 19, 4:43 AM EDT	Mesoscale Discussion	SPC	Butler, Christian, Logan, McLean, Muhlenberg, Ohio and 3 more	92 min
Apr 19, 5:12 AM EDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Barren, Butler, Clinton, Cumberland and 12 more	4 hr
Apr 19, 7:28 AM EDT	Mesoscale Discussion	SPC	Bell, Clay, Clinton, Harlan, Jackson, Knott and 12 more	62 min
Apr 19, 8:58 AM EDT	Mesoscale Discussion	SPC	Bradley, Polk	2 hr
Apr 19, 10:59 AM EDT	Severe Thunderstorm Watch	SPC	Franklin, Lincoln, Moore	6 hr

Nearby

Mesoscale Discussions in Tennessee, 2006 Mesoscale Discussions in Kentucky, 2006 Mesoscale Discussions in Virginia, 2006 Every mesoscale discussion in 2006

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.