Alert archive / Tennessee / Mesoscale Discussions in 2008
Mesoscale Discussion 474
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2008, 1:32 PM CDT for 6 states. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2008, 1:32 PM CDT (18:32 UTC)
- Expired
- Mar 19, 2008, 2:30 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 61 counties
Jackson County, AL, Catoosa County, GA, Dade County, GA, Bell County, KY, Breathitt County, KY, Clay County, KY, Floyd County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Pulaski County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Anderson County, TN, Bledsoe County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Coffee County, TN, Cumberland County, TN, Fentress County, TN, Franklin County, TN, Grainger County, TN, Grundy County, TN, Hamilton County, TN, Hancock County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Lee County, VA, Wise County, VA, Mingo County, WV
The radar
The Knoxville radar (KMRX), 73 km from the middle of the area, began a volume at 18:34 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.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 6.5 hours before the alert went out and 231 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 518 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 623 m²/s²
- 0-3 km storm-relative helicity
- 803 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Mar 19, 4:55 AM CDT | Mesoscale Discussion | SPC | Blount, Colbert, Cullman, Fayette, Franklin, Lamar and 11 more | 2 hr |
| Mar 19, 7:08 AM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 54 more | 2 hr |
| Mar 19, 1:49 PM CDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 74 more | 116 min |
| Mar 18, 8:43 PM CDT | Mesoscale Discussion | SPC | Caldwell, Calloway, Christian, Fulton, Graves, Hickman and 3 more | 92 min |
| Mar 19, 1:13 AM CDT | Mesoscale Discussion | SPC | Allen, Barren, Bullitt, Butler, Calloway, Christian and 18 more | 62 min |
| Mar 19, 2:03 PM CDT | Tornado Watch | SPC | Bell, Breathitt, Clay, Estill, Floyd, Harlan and 19 more | 5 hr |
| Mar 19, 3:54 PM CDT | Mesoscale Discussion | SPC | Bell, Boyd, Breathitt, Clay, Elliott, Floyd and 14 more | 66 min |
| Mar 18, 10:51 PM CDT | Tornado Watch | SPC | Chester, Decatur, Hardeman, Hardin, Henderson, McNairy | 8 hr |
| Mar 18, 11:42 PM CDT | Mesoscale Discussion | SPC | Carroll, Crockett, Fayette, Gibson, Hardeman, Haywood and 6 more | 63 min |
| Mar 19, 4:43 PM CDT | Severe Thunderstorm Watch | SPC | Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more | 4 hr |
| Mar 19, 6:19 PM CDT | Mesoscale Discussion | SPC | Blount, Carter, Cocke, Greene, Hamblen, Hawkins and 8 more | 86 min |
Nearby
Mesoscale Discussions in Tennessee, 2008Mesoscale Discussions in Kentucky, 2008Mesoscale Discussions in Georgia, 2008Every mesoscale discussion in 2008
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.