Alert archive / Tennessee / Mesoscale Discussions in 2006
Mesoscale Discussion 912
The Storm Prediction Center issued this mesoscale discussion at May 20, 2006, 6:31 PM CDT for 5 states. It was in force for 29 min.
The area
The outline as issued.
The facts
- Issued
- May 20, 2006, 6:31 PM CDT (23:31 UTC)
- Expired
- May 20, 2006, 7:00 PM CDT
- In force
- 29 min
- Issued by
- the Storm Prediction Center
All 46 counties
Lauderdale County, AL, Limestone County, AL, Baxter County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Stone County, AR, Dunklin County, MO, Pemiscot County, MO, Alcorn County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Hickman County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN
The radar
The Memphis radar (KNQA), 34 km from the middle of the area, began a volume at 23:34 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, 11.5 hours before the alert went out and 311 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
- 191 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1108 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 |
|---|---|---|---|---|
| May 20, 11:40 AM CDT | Mesoscale Discussion | SPC | DeKalb, Jackson, Limestone, Madison | 2 hr |
| May 20, 12:19 PM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Jackson, Limestone, Madison, Marshall | 8 hr |
| May 20, 5:45 PM CDT | Mesoscale Discussion | SPC | Jackson, Lauderdale, Limestone, Madison | 90 min |
| May 20, 6:59 PM CDT | Severe Thunderstorm Watch | SPC | Lauderdale | 6 hr |
| May 19, 11:07 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Cannon and 43 more | 23 min |
| May 19, 11:09 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 34 more | 6 hr |
| May 20, 2:57 AM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Cocke and 25 more | 63 min |
| May 20, 3:38 PM CDT | Mesoscale Discussion | SPC | Bledsoe, Blount, Bradley, Cumberland, Hamilton, Loudon and 10 more | 97 min |
Nearby
Mesoscale Discussions in Tennessee, 2006Mesoscale Discussions in Arkansas, 2006Mesoscale Discussions in Alabama, 2006Every mesoscale discussion in 2006
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.