Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 204
The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 9:07 AM CST for 7 counties in Alabama; 6 counties in Georgia; 34 counties in Tennessee. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2012, 9:07 AM CST (15:07 UTC)
- Expired
- Mar 2, 2012, 10:00 AM CST
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 47 counties
DeKalb County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN
The radar
The Northeast Alabama radar (KHTX), 54 km from the middle of the area, began a volume at 15:10 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, 3.1 hours before the alert went out and 123 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
- 1667 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.1
The text
As transmitted, in the capitals the NWS used until 2016.
671
ACUS11 KWNS 021508
SWOMCD
SPC MCD 021507
TNZ000-NCZ000-GAZ000-ALZ000-021600-
MESOSCALE DISCUSSION 0204
NWS STORM PREDICTION CENTER NORMAN OK
0907 AM CST FRI MAR 02 2012
AREAS AFFECTED...NRN AL...MIDDLE/ERN TN...FAR NWRN GA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 021507Z - 021600Z
RADAR TRENDS INDICATE AN INCREASE IN AREAL COVERAGE AND INTENSITY OF
TSTMS ACROSS NRN AL AND MIDDLE TN. THE AREA IS BEING MONITORED FOR A
POSSIBLE TORNADO WATCH.
LOOSELY ORGANIZED TSTMS HAVE INCREASED IN AREAL COVERAGE WITHIN A
WEAK WAA ADVECTION REGIME ACROSS NRN AL INTO PARTS OF MIDDLE TN. 12Z
QAG/BMX SOUNDINGS INDICATE A WEAK STABLE LAYER NEAR 1 KM AGL...BUT
WITH CONTINUED HEATING THE ENVIRONMENT SHOULD BECOME MORE FAVORABLE
FOR SFC BASED PARCELS WITHIN THE NEXT 1-2 HRS. GWX VWP DATA ALSO
SHOW A STRONG/CYCLONICALLY CURVED LOW-LEVEL HODOGRAPH...WITH 0-1 KM
BULK SHEAR NEAR 35 KTS. PRIMARY UNCERTAINTY ATTM IS WITH THE
EVOLUTION OF TSTMS...GIVEN LACK OF ROBUST FORCING
MECHANISMS/MESOSCALE BOUNDARIES...BUT WITH A STRONGLY SHEARED AND
MODERATELY UNSTABLE BACKGROUND ENVIRONMENT...THE POTENTIAL FOR LARGE
HAIL...DMGG WINDS...AND A TORNADO OR TWO WILL EXIST. CONVECTIVE
TRENDS WILL BE MONITORED OVER THE NEXT FEW HRS FOR A POSSIBLE
TORNADO WATCH.
..ROGERS.. 03/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MRX...FFC...OHX...BMX...HUN...
LAT...LON 35888425 35038426 34308550 34158620 34168757 34568792
35998670 36478586 36548448 35888425SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 9:25 AM CST | Tornado Watch | SPC | DeKalb, Jackson, Lawrence, Limestone, Madison, Marshall and 1 more | 5 hr |
| Mar 2, 11:46 AM CST | Mesoscale Discussion | SPC | DeKalb, Jackson, Madison, Marshall, Morgan | 29 min |
| Mar 2, 12:57 PM CST | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 2 more | 63 min |
| Mar 2, 1:20 PM CST | Tornado Watch | SPC | Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 14 more | 9 hr |
| Mar 2, 2:42 PM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 18 more | 63 min |
| Mar 2, 3:25 PM CST | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more | 65 min |
| Mar 2, 4:37 PM CST | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more | 7 hr |
| Mar 2, 5:41 PM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Butler and 36 more | 2 hr |
| Mar 2, 2:30 AM CST | Mesoscale Discussion | SPC | Banks, Dawson, Fannin, Franklin, Gilmer, Habersham and 8 more | 90 min |
| Mar 2, 1:58 PM CST | Mesoscale Discussion | SPC | Bartow, Catoosa, Cherokee, Dawson, Fannin, Forsyth and 14 more | 62 min |
| Mar 2, 2:19 PM CST | Tornado Watch | SPC | Banks, Bartow, Catoosa, Chattooga, Cherokee, Dade and 23 more | 8 hr |
| Mar 2, 3:40 AM CST | Mesoscale Discussion | SPC | Clay, Fentress, Overton, Pickett, Scott | 65 min |
| Mar 2, 9:22 AM CST | Mesoscale Discussion | SPC | Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 28 more | 113 min |
| Mar 2, 10:28 AM CST | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Haywood, Lake and 5 more | 62 min |
| Mar 2, 12:05 PM CST | Mesoscale Discussion | SPC | Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 28 more | 85 min |
| Mar 2, 2:35 PM CST | Mesoscale Discussion | SPC | Clay, Macon, Pickett, Sumner | 85 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.