Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 462
The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 3:06 PM CDT for 10 counties in Alabama; Cherokee County, Clay County, North Carolina; 66 counties in Tennessee. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2012, 3:06 PM CDT (20:06 UTC)
- Expired
- Apr 5, 2012, 4:00 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 78 counties
Colbert County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Cherokee County, NC, Clay County, NC, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Cheatham County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grainger County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Montgomery County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Northeast Alabama radar (KHTX), 85 km from the middle of the area, began a volume at 20:08 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, 8.1 hours before the alert went out and 166 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
- 670 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
044
ACUS11 KWNS 052007
SWOMCD
SPC MCD 052006
NCZ000-TNZ000-VAZ000-KYZ000-GAZ000-ALZ000-MSZ000-052100-
MESOSCALE DISCUSSION 0462
NWS STORM PREDICTION CENTER NORMAN OK
0306 PM CDT THU APR 05 2012
AREAS AFFECTED...NRN AL...FAR WRN NC...MIDDLE/ERN TN
CONCERNING...SEVERE THUNDERSTORM WATCH 147...
VALID 052006Z - 052100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 147
CONTINUES.
SURFACE ANALYSIS AT 19-20Z SHOWS ONE AREA OF LOW PRESSURE OVER NWRN
TN...AND ANOTHER OVER ERN TN. A STATIONARY FRONT EXTENDS EWD ACROSS
MIDDLE TN TOWARD THE ERN TN LOW...WHILE A COLD FRONT ARCS SEWD FROM
THE NWRN TN LOW INTO ERN AL. STORMS ARE EXPANDING IN COVERAGE ALONG
THE WRN TN-ERN AL FRONTAL SEGMENT...WHILE ISOLATED TO SCATTERED
THUNDERSTORMS CONTINUE TO PERSIST ALONG THE MIDDLE/ERN TN STATIONARY
FRONT. THE SURFACE AIRMASS BETWEEN THE TWO FRONTAL BOUNDARIES
REMAINS WARM AND MOIST...WHICH SUPPORTS MLCAPE VALUES FROM 500-1000
J/KG. AS SUCH...STORMS WILL CONTINUE TO POSE A THREAT FOR LARGE HAIL
AND DAMAGING WIND GUSTS.
..GARNER.. 04/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GSP...MRX...JKL...FFC...LMK...OHX...BMX...HUN...
PAH...MEG...
LAT...LON 34998559 34528550 34228583 34128632 34298649 34348817
35038800 36688806 36638362 35958290 35768297 35498390
35378404 35218401 35238369 35018364 34998559SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 7:36 AM CDT | Mesoscale Discussion | SPC | Choctaw, Greene, Hale, Marengo, Perry, Pickens and 2 more | 54 min |
| Apr 5, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 34 more | 8 hr |
| Apr 5, 10:41 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 15 more | 94 min |
| Apr 5, 12:09 PM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Franklin, Lauderdale, Lawrence, Limestone and 4 more | 96 min |
| Apr 5, 1:12 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Chambers, Clay, Coffee, Covington and 11 more | 93 min |
| Apr 5, 1:21 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, DeKalb, Franklin, Jackson, Lauderdale, Lawrence and 4 more | 8 hr |
| Apr 5, 1:58 PM CDT | Severe Thunderstorm Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 6 hr |
| Apr 5, 3:46 PM CDT | Mesoscale Discussion | SPC | Blount, Calhoun, Cullman, Etowah, Fayette, Jefferson and 7 more | 59 min |
| Apr 5, 3:49 PM CDT | Mesoscale Discussion | SPC | Geneva, Henry, Houston | 86 min |
| Apr 5, 6:14 PM CDT | Severe Thunderstorm Watch | SPC | Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 21 more | 3 hr |
| Apr 5, 6:15 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 23 more | 45 min |
| Apr 5, 12:03 PM CDT | Mesoscale Discussion | SPC | Buncombe, Clay, Cleveland, Gaston, Haywood, Henderson and 10 more | 87 min |
| Apr 5, 12:47 PM CDT | Severe Thunderstorm Watch | SPC | Buncombe, Cleveland, Gaston, Graham, Haywood, Henderson and 9 more | 7 hr |
| Apr 5, 12:54 PM CDT | Mesoscale Discussion | SPC | Cherokee, Clay, Graham, Haywood, Macon, Madison and 1 more | 96 min |
| Apr 5, 2:37 PM CDT | Mesoscale Discussion | SPC | Buncombe, Clay, Cleveland, Gaston, Graham, Haywood and 13 more | 53 min |
| Apr 5, 12:18 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more | 5 hr |
| Apr 5, 2:22 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Chester, Crockett, Decatur, Dyer and 16 more | 53 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in North Carolina, 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.