Alert archive / Tennessee / Mesoscale Discussions in 2004
Mesoscale Discussion 447
The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 11:09 AM CDT for 40 counties in Tennessee. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2004, 11:09 AM CDT (16:09 UTC)
- Expired
- Apr 23, 2004, 1:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 40 counties
Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hickman County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Meigs County, TN, Moore County, TN, Overton County, TN, Perry County, TN, Putnam County, TN, Rhea County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 56 km from the middle of the area, began a volume at 16:09 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
Nashville Metro, TN (KBNA), launched 12:00Z, 4.2 hours before the alert went out and 42 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
- 226 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 11:25 PM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Haywood, Lake, Lauderdale and 3 more | 65 min |
| Apr 22, 11:40 PM CDT | Severe Thunderstorm Watch | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 7 more | 6 hr |
| Apr 23, 3:12 AM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 7 more | 93 min |
| Apr 23, 7:33 AM CDT | Mesoscale Discussion | SPC | Fayette, Hardeman, Shelby, Tipton | 87 min |
Nearby
Mesoscale Discussions in Tennessee, 2004Every mesoscale discussion in 2004
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.