Alert archive / Tennessee / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 356

May 11, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2003, 6:55 AM EDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2003, 6:55 AM EDT (10:55 UTC)
Expired
May 11, 2003, 12:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 43 counties

Bell County, KY, Harlan County, KY, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Swain County, NC, Anderson County, TN, Blount County, TN, Bradley County, TN, Carter 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, Johnson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Roane County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 48 km from the middle of the area, began a volume at 10:56 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.

Warnings issued inside it

10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 11, 7:05 AM EDTSevere Thunderstorm WarningMRXLoudon, McMinn, Monroe55 min
May 11, 7:11 AM EDTSevere Thunderstorm WarningMRXKnox, Union49 min
May 11, 7:22 AM EDTSevere Thunderstorm WarningMRXBlount53 min
May 11, 7:25 AM EDTSevere Thunderstorm WarningMRXLoudon, McMinn, Monroe35 min
May 11, 7:26 AM EDTSevere Thunderstorm WarningMRXClaiborne, Grainger49 min
May 11, 7:44 AM EDTSevere Thunderstorm WarningMRXJefferson, Sevier61 min
May 11, 7:51 AM EDTSevere Thunderstorm WarningMRXCocke54 min
May 11, 7:57 AM EDTSevere Thunderstorm WarningMRXHamblen48 min
May 11, 8:03 AM EDTSevere Thunderstorm WarningMRXHancock, Hawkins57 min
May 11, 8:19 AM EDTSevere Thunderstorm WarningMRXGreene56 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 10.9 hours before the alert went out and 263 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 00:00Z on 2003-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1200 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2003-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
1200 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1378 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 8:06 PM EDTMesoscale DiscussionSPCBallard, Calloway, Carlisle, Crittenden, Fulton, Graves and 5 more54 min
May 10, 9:28 PM EDTMesoscale DiscussionSPCBreathitt, Floyd, Johnson, Knott, Magoffin, Martin and 1 more62 min
May 10, 9:45 PM EDTTornado WatchSPCBallard, Carlisle, Fulton, Graves, Hickman, Livingston and 2 more5 hr
May 10, 10:10 PM EDTTornado WatchSPCOldham5 hr
May 10, 11:04 PM EDTMesoscale DiscussionSPCAllen, Barren, Breckinridge, Butler, Caldwell, Calloway and 23 more116 min
May 11, 12:20 AM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 38 more6 hr
May 11, 12:28 AM EDTMesoscale DiscussionSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 2 more2 hr
May 11, 2:46 AM EDTMesoscale DiscussionSPCAllen, Anderson, Barren, Bourbon, Boyle, Breckinridge and 46 more89 min
May 11, 5:16 AM EDTMesoscale DiscussionSPCAdair, Anderson, Barren, Bath, Bell, Bourbon and 68 more59 min
May 11, 6:05 AM EDTSevere Thunderstorm WatchSPCBath, Bell, Bourbon, Boyle, Breathitt, Casey and 38 more4 hr
May 10, 8:59 PM EDTMesoscale DiscussionSPCBertie, Camden, Chowan, Dare, Edgecombe, Gates and 11 more91 min
May 11, 4:10 AM EDTMesoscale DiscussionSPCBedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 18 more95 min
May 11, 4:20 AM EDTSevere Thunderstorm WatchSPCBedford, Bledsoe, Campbell, Cannon, Clay, Coffee and 25 more5 hr
May 11, 6:22 AM EDTMesoscale DiscussionSPCBedford, Bledsoe, Campbell, Cannon, Coffee, Cumberland and 24 more83 min
May 11, 3:18 PM EDTMesoscale DiscussionSPCAccomack, Arlington, Caroline, Charles City, Chesterfield, Clarke and 34 more117 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2003Severe Thunderstorm Watches in North Carolina, 2003Severe Thunderstorm Watches in Virginia, 2003Every severe thunderstorm watch in 2003

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.