Alert archive / Tennessee / Mesoscale Discussions in 2013
Mesoscale Discussion 498
The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 3:53 PM CDT for 5 states. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2013, 3:53 PM CDT (20:53 UTC)
- Expired
- Apr 17, 2013, 5:00 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 75 counties
Hardin County, IL, Pope County, IL, Crawford County, IN, Harrison County, IN, Perry County, IN, Spencer County, IN, Warrick County, IN, Allen County, KY, Breckinridge County, KY, Butler County, KY, Caldwell County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Henderson County, KY, Hopkins County, KY, Logan County, KY, Lyon County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Cherokee County, NC, Clay County, NC, Graham County, NC, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Montgomery County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 66 km from the middle of the area, began a volume at 20:54 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, 8.9 hours before the alert went out and 77 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
- 1987 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 747 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.7
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 16, 8:02 PM CDT | Mesoscale Discussion | SPC | Edwards, Gallatin, Hamilton, Hardin, Saline, Wabash and 1 more | 88 min |
| Apr 16, 8:44 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 35 more | 2 hr |
| Apr 17, 8:49 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Cass, DeWitt, Ford and 32 more | 56 min |
| Apr 17, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more | 10 hr |
| Apr 17, 9:30 AM CDT | Mesoscale Discussion | SPC | Hardin | 2 hr |
| Apr 17, 11:11 AM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 1 more | 11 hr |
| Apr 17, 12:39 PM CDT | Severe Thunderstorm Watch | SPC | Hardin, Pope | 5 hr |
| Apr 17, 1:33 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more | 57 min |
| Apr 17, 3:04 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Coles, Cumberland and 26 more | 56 min |
| Apr 17, 3:33 PM CDT | Tornado Watch | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 24 more | 8 hr |
| Apr 17, 3:38 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 1 more | 97 min |
| Apr 17, 6:02 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Pike | 88 min |
| Apr 17, 6:46 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 18 more | 89 min |
| Apr 17, 4:39 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clay, Daviess, Dubois, Greene and 12 more | 96 min |
Nearby
Mesoscale Discussions in Tennessee, 2013Mesoscale Discussions in Kentucky, 2013Mesoscale Discussions in Indiana, 2013Every mesoscale discussion in 2013
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.