Alert archive / Tennessee / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 790
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2003, 4:50 PM EDT for 27 counties in Tennessee. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2003, 4:50 PM EDT (20:50 UTC)
- Expired
- Jul 21, 2003, 9:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cumberland County, TN, Grainger County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN
The radar
The Knoxville radar (KMRX), 129 km from the middle of the area, began a volume at 20:51 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:16 PM EDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 44 min |
| Jul 21, 5:16 PM EDT | Severe Thunderstorm Warning | MRX | McMinn | 59 min |
| Jul 21, 5:19 PM EDT | Severe Thunderstorm Warning | MRX | Meigs | 41 min |
| Jul 21, 5:27 PM EDT | Severe Thunderstorm Warning | OHX | Cumberland | 48 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 12:00Z, 8.8 hours before the alert went out and 181 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.
- Mixed-layer CAPE
- 1467 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 1108 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 8:03 AM EDT | Mesoscale Discussion | SPC | Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 18 more | 117 min |
| Jul 21, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | Bedford, Benton, Cannon, Carroll, Cheatham, Chester and 45 more | 6 hr |
| Jul 21, 2:41 PM EDT | Mesoscale Discussion | SPC | Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 16 more | 64 min |
| Jul 21, 4:14 PM EDT | Mesoscale Discussion | SPC | Bedford, Bledsoe, Blount, Bradley, Cannon, Clay and 37 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 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.