Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 558

April 19, 20064 states

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2006, 7:28 AM EDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Apr 19, 2006, 7:28 AM EDT (11:28 UTC)
Expired
Apr 19, 2006, 8:30 AM EDT
In force
62 min
Issued by
the Storm Prediction Center
All 61 counties

Bell County, KY, Clay County, KY, Clinton County, KY, Harlan County, KY, Jackson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, McCreary County, KY, Owsley County, KY, Perry County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Wayne County, KY, Whitley County, KY, Avery County, NC, Buncombe County, NC, Burke County, NC, Haywood County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Swain County, NC, Yancey County, NC, Anderson County, TN, Blount County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Roane County, TN, Scott County, TN, Sevier County, TN, Smith County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Norton, VA, Lee County, VA, Scott County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 50 km from the middle of the area, began a volume at 11:31 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.5 hours before the alert went out and 348 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, Cncnati-Daytn, OH at 00:00Z on 2006-04-19Temperature 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, Cncnati-Daytn, OH at 00:00Z on 2006-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.19395878Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Apr 19, 1:50 AM EDTSevere Thunderstorm WatchSPCAnderson, Bourbon, Boyle, Breckinridge, Bullitt, Carroll and 29 more6 hr
Apr 19, 2:29 AM EDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more4 hr
Apr 19, 3:02 AM EDTMesoscale DiscussionSPCBell, Clay, Harlan, Knox, Laurel, McCreary and 2 more118 min
Apr 19, 3:39 AM EDTSevere Thunderstorm WatchSPCBath, Bell, Breathitt, Clay, Estill, Harlan and 20 more7 hr
Apr 19, 4:43 AM EDTMesoscale DiscussionSPCButler, Christian, Logan, McLean, Muhlenberg, Ohio and 3 more92 min
Apr 19, 5:12 AM EDTSevere Thunderstorm WatchSPCAdair, Allen, Barren, Butler, Clinton, Cumberland and 12 more4 hr
Apr 19, 8:58 AM EDTMesoscale DiscussionSPCBradley, Polk2 hr
Apr 19, 10:59 AM EDTSevere Thunderstorm WatchSPCFranklin, Lincoln, Moore6 hr

Nearby

Mesoscale Discussions in Tennessee, 2006Mesoscale Discussions in Kentucky, 2006Mesoscale Discussions in North Carolina, 2006Every 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.