Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 254
The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2012, 3:01 PM CDT for 7 counties in Alabama; Alcorn County, Prentiss County, Tishomingo County, Mississippi; 14 counties in Tennessee. It was in force for 104 min.
The area
The outline as issued.
The facts
- Issued
- Mar 14, 2012, 3:01 PM CDT (20:01 UTC)
- Expired
- Mar 14, 2012, 4:45 PM CDT
- In force
- 104 min
- Issued by
- the Storm Prediction Center
All 24 counties
Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Morgan County, AL, Alcorn County, MS, Prentiss County, MS, Tishomingo County, MS, Chester County, TN, Decatur County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Wayne County, TN
The radar
The Columbus AFB radar (KGWX), 139 km from the middle of the area, began a volume at 20:04 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, 8.0 hours before the alert went out and 158 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
- 486 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1099 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
685
ACUS11 KWNS 142002
SWOMCD
SPC MCD 142001 COR
ALZ000-TNZ000-MSZ000-142145-
MESOSCALE DISCUSSION 0254
NWS STORM PREDICTION CENTER NORMAN OK
0301 PM CDT WED MAR 14 2012
AREAS AFFECTED...FAR NERN MS...NRN AL...S-CNTRL TN
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 142001Z - 142145Z
CORRECTED FOR GEOGRAPHIC REFERENCE
A MARGINAL THREAT FOR DMGG WINDS WILL EXIST LATE THIS AFTERNOON AND
EVENING ACROSS PORTIONS OF FAR NERN MS...NRN AL...S-CNTRL TN.
EXPECTED ISOLATED NATURE OF THE THREAT LIMITS THE NEED FOR A WW.
TEMPERATURES HAVE WARMED INTO THE UPPER 70S AND LOW 80S AND MOISTURE
ADVECTION ASSOCIATED WITH RETURN FLOW ACROSS A BROAD WARM SECTOR HAS
KEPT DEWPOINTS IN THE MID 60S. ADDITIONALLY... NEAR DRY ADIABATIC
LAPSE RATES ARE PRESENT ABOVE 700 MB. AS A RESULT...AN UNCAPPED
ENVIRONMENT WITH SBCAPE VALUES AOA 2500 J/KG EXISTS OVER THE REGION.
HOWEVER...THE SEVERE THREAT IS EXPECTED TO BE LIMITED...OWING TO THE
LACK OF STRONG FORCING AND EFFECTIVE BULK SHEAR OF 25-30 KT /LOWER
MARGINS FOR PERSISTENT STORMS/. CONSEQUENTLY...A MARGINAL THREAT FOR
DMGG WINDS IS POSSIBLE BUT THE LIMITED COVERAGE WILL PRECLUDE THE
NEED FOR A WW.
..MOSIER.. 03/14/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...BMX...HUN...MEG...
LAT...LON 35508877 35908799 35758668 35168634 34528643 34278695
34258776 34468840 35028897 35508877Nearby
Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Mississippi, 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.