Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 406
The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2012, 2:31 PM EDT for Rabun County, Georgia; 13 counties in North Carolina; 17 counties in Tennessee. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Apr 1, 2012, 2:31 PM EDT (18:31 UTC)
- Expired
- Apr 1, 2012, 4:00 PM EDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 31 counties
Rabun County, GA, Buncombe County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Anderson County, TN, Blount County, TN, Campbell County, TN, Cocke County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Monroe County, TN, Morgan County, TN, Roane County, TN, Sevier County, TN, Unicoi County, TN, Union County, TN
The radar
The Knoxville radar (KMRX), 36 km from the middle of the area, began a volume at 18:31 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, 6.5 hours before the alert went out and 282 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
- 1040 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
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 31, 8:27 PM EDT | Mesoscale Discussion | SPC | Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 15 more | 63 min |
| Apr 1, 12:33 AM EDT | Mesoscale Discussion | SPC | Hardeman | 57 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in North Carolina, 2012Mesoscale Discussions in Georgia, 2012Every mesoscale discussion in 2012
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.