Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 77
The Storm Prediction Center issued this mesoscale discussion at Jan 26, 2012, 5:35 PM CST for 11 counties in Alabama; 9 counties in Mississippi; Lawrence County, Tennessee. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jan 26, 2012, 5:35 PM CST (23:35 UTC)
- Expired
- Jan 26, 2012, 6:30 PM CST
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 21 counties
Colbert County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Marion County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Clay County, MS, Itawamba County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Noxubee County, MS, Prentiss County, MS, Tishomingo County, MS, Lawrence County, TN
The radar
The Columbus AFB radar (KGWX), 48 km from the middle of the area, began a volume at 23:36 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
Birmingham, AL (KBMX), launched 12:00Z, 11.6 hours before the alert went out and 157 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
- 274 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 478 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
283
ACUS11 KWNS 262335
SWOMCD
SPC MCD 262335
ALZ000-TNZ000-MSZ000-270030-
MESOSCALE DISCUSSION 0077
NWS STORM PREDICTION CENTER NORMAN OK
0535 PM CST THU JAN 26 2012
AREAS AFFECTED...NERN MS/NWRN AL/MIDDLE TN
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 262335Z - 270030Z
THUNDERSTORMS CAPABLE OF SMALL HAIL AND GUSTY WINDS WILL BE POSSIBLE
OVER THE NEXT HOUR OR TWO...BEFORE QUICKLY DIMINISHING AFTER DARK.
DUE TO THE BRIEF/MARGINAL NATURE...A WW SHOULD NOT BE NEEDED.
AN AREA OF CLEARING OCCURRING BEHIND A SQUALL LINE /NOW LOCATED IN
WRN GA AND THE CNTRL FL PANHANDLE/ HAS SUPPORTED MARGINAL
DESTABILIZATION ACROSS A SMALL CORRIDOR IN NERN MS AND AL. FORCING
FOR ASCENT...IN COMBINATION WITH SURFACE CONVERGENCE IS SUPPORTING A
SMALL LINE OF THUNDERSTORMS THAT MAY BE CAPABLE OF SMALL HAIL AND
GUSTY WINDS...GIVEN COOLING MIDLEVEL TEMPERATURES AND THE MAGNITUDE
OF STRONGER FLOW PERSISTING ACROSS THE AREA. VERY WEAK INSTABILITY
WILL GENERALLY LIMIT MORE SIGNIFICANT SEVERE POTENTIAL...WHILE
DIURNAL COOLING QUICKLY LEADS TO STABILIZATION...FURTHER LIMITING
SEVERE POTENTIAL SHORTLY.
..HURLBUT.. 01/26/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OHX...BMX...HUN...MEG...JAN...
LAT...LON 34858700 33708727 32888774 32768852 33368879 34298879
34898866 35178834 35248739 34858700SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 26, 2:05 AM CST | Mesoscale Discussion | SPC | Mobile, Washington | 2 hr |
| Jan 26, 4:18 AM CST | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 3 more | 7 hr |
| Jan 26, 7:29 AM CST | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 3 more | 91 min |
| Jan 26, 9:34 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Bullock, Butler, Calhoun and 24 more | 86 min |
| Jan 26, 9:55 AM CST | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 34 more | 7 hr |
| Jan 26, 2:16 PM CST | Mesoscale Discussion | SPC | Barbour, Dale, Henry, Houston, Lee, Russell | 119 min |
| Jan 25, 8:23 PM CST | Mesoscale Discussion | SPC | Amite, Jefferson Davis, Lawrence, Lincoln, Marion, Pike and 2 more | 97 min |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Tennessee, 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.