Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 350
The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2012, 4:52 PM CDT for 9 counties in Alabama; Chattooga County, Dade County, Walker County, Georgia; 12 counties in Tennessee. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2012, 4:52 PM CDT (21:52 UTC)
- Expired
- Mar 24, 2012, 5:45 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 24 counties
Cullman County, AL, DeKalb County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Chattooga County, GA, Dade County, GA, Walker County, GA, Bedford County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Lawrence County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Moore County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 29 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 130 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
- 4 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1094 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
805
ACUS11 KWNS 242152
SWOMCD
SPC MCD 242152
TNZ000-GAZ000-ALZ000-242245-
MESOSCALE DISCUSSION 0350
NWS STORM PREDICTION CENTER NORMAN OK
0452 PM CDT SAT MAR 24 2012
AREAS AFFECTED...SRN MIDDLE TN...NORTH AL...FAR NWRN GA
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 242152Z - 242245Z
A FEW STRONG STORMS PRODUCING HAIL AND GUSTY WINDS WILL BE POSSIBLE
ACROSS SRN MIDDLE TN...NORTH AL...AND FAR NWRN GA THROUGH SUNSET.
ANY INSTANCES OF SVR STORMS WILL BE SPORADIC AND MARGINAL...AND...AS
SUCH...THE ISSUANCE OF A WW IS NOT WARRANTED.
CONVECTION HAS RECENTLY SHOWN SOME SIGNS OF INTENSIFICATION OVER
PARTS OF SRN MIDDLE TN AND NORTH AL ALONG SEWD-MOVING LOW-LEVEL
CONVERGENCE BANDS BENEATH COLD MID-LEVEL TEMPERATURES ATTENDANT TO A
CLOSED LOW OVER THE OH/TN RIVER VALLEY REGION. POCKETS OF INSOLATION
AHEAD OF THE CONVERGENCE BANDS HAVE STEEPENED LOW-LEVEL LAPSE
RATES...YIELDING SUFFICIENT /ALBEIT MARGINAL/ SBCAPE SUCH THAT
DEEPER CONVECTION WILL BE OF CONCERN ACROSS THE DISCUSSION AREA.
SMALL HAIL AND GUSTY WINDS WILL BE POSSIBLE WITH THIS ACTIVITY. A
BAND OF ENHANCED DEEP-LAYER FLOW OVER THE SRN FRINGES OF THE CLOSED
LOW IS BEING MANIFESTED IN THE UNIDIRECTIONAL WLY WIND PROFILE
SAMPLED BY THE HUNTSVILLE VWP DATA...WHICH FEATURE 43 KT OF SFC-6-KM
BULK SHEAR. THIS MAY SUPPORT A FEW INSTANCES OF MORE
ORGANIZED/PERSISTENT LINE SEGMENTS OR MULTICELL CLUSTERS WITH AN
ISOLATED/BRIEF THREAT FOR MARGINALLY SVR HAIL/WIND. HOWEVER...THE
ABSENCE OF GREATER BUOYANCY WILL PREVENT A MORE ROBUST THREAT FROM
ENSUING. THE THREAT FOR STRONG/SVR STORMS SHOULD CEASE QUICKLY AFTER
SUNSET AS THE NOCTURNAL STABILIZATION COMMENCES.
..COHEN.. 03/24/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MRX...FFC...OHX...BMX...HUN...
LAT...LON 35678650 35658539 35038514 34458529 34048623 34188732
34778786 35318734 35678650SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 9:16 AM CDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Berrien, Brantley, Bryan and 25 more | 59 min |
| Mar 24, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 23 more | 8 hr |
| Mar 24, 11:29 AM CDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 19 more | 61 min |
| Mar 24, 3:16 PM CDT | Mesoscale Discussion | SPC | Richmond | 59 min |
| Mar 24, 3:19 PM CDT | Mesoscale Discussion | SPC | Brantley, Camden, Charlton, Clinch, Echols, Glynn and 6 more | 86 min |
| Mar 24, 5:25 PM CDT | Mesoscale Discussion | SPC | Brantley, Bryan, Camden, Charlton, Chatham, Clinch and 8 more | 65 min |
| Mar 23, 8:06 PM CDT | Mesoscale Discussion | SPC | Clay, Davidson, DeKalb, Jackson, Macon, Robertson and 5 more | 54 min |
| Mar 23, 10:16 PM CDT | Mesoscale Discussion | SPC | Bledsoe, Bradley, Clay, Cumberland, DeKalb, Fentress and 18 more | 89 min |
Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Alabama, 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.