Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 75
The Storm Prediction Center issued this mesoscale discussion at Jan 26, 2012, 9:34 AM CST for 30 counties in Alabama; 5 counties in Florida. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Jan 26, 2012, 9:34 AM CST (15:34 UTC)
- Expired
- Jan 26, 2012, 11:00 AM CST
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 35 counties
Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Talladega County, AL, Tallapoosa County, AL, Wilcox County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL
The radar
The Eglin Afb radar (KEVX), 126 km from the middle of the area, began a volume at 15:34 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
Birmingham, AL (KBMX), launched 12:00Z, 3.6 hours before the alert went out and 202 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.
333
ACUS11 KWNS 261534
SWOMCD
SPC MCD 261534 COR
ALZ000-FLZ000-261700-
MESOSCALE DISCUSSION 0075
NWS STORM PREDICTION CENTER NORMAN OK
0934 AM CST THU JAN 26 2012
AREAS AFFECTED...AL...WRN FL PNHDL
CONCERNING...TORNADO WATCH 17...
VALID 261534Z - 261700Z
CORRECTED SPELLING OF GADSDEN
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 17 CONTINUES.
AN ADDITIONAL WW PROBABLY WILL BE NEEDED ACROSS MUCH OF CENTRAL AND
SOUTHERN ALABAMA...AND PARTS OF THE FLORIDA PANHANDLE... TOWARD
17-18Z.
THICK CLOUD COVER IS SLOWING THE DESTABILIZATION OF THE BOUNDARY
AHEAD OF THE SQUALL LINE NOW ADVANCING ACROSS THE SOUTHERN
MISSISSIPPI/ALABAMA BORDER AREA. AND...WITH LAPSE RATES ONLY WEAKLY
UNSTABLE THROUGH MUCH OF THE LOWER/MID TROPOSPHERE...CAPE SHOULD
REMAIN RATHER LOW...DESPITE THE PRESENCE OF SEASONABLY HIGH MOISTURE
CONTENT AIR. HOWEVER...WITH TIME...A GRADUAL DESTABILIZATION WITH
FILTERED INSOLATION PROBABLY WILL BECOME SUFFICIENT TO SUPPORT
INTENSIFICATION OF THE ONGOING LINE...BOTH EASTWARD AND
NORTHEASTWARD...ACROSS MUCH OF CENTRAL AND SOUTHERN ALABAMA BY THE
18-21Z TIME FRAME. THIS WILL BE AIDED BY FORCING ASSOCIATED WITH
CONSOLIDATING UPSTREAM SHORT WAVE TROUGHS WHICH WILL SLOWLY ADVANCE
THROUGH THE MID AND LOWER MISSISSIPPI VALLEY LATE THIS AFTERNOON AND
EVENING.
AN INITIAL CONVECTIVE OUTFLOW BOUNDARY ALONG AND SOUTHEAST OF THE
I-59 CORRIDOR PROBABLY WILL NOT RETREAT MUCH...BUT THE SEVERE THREAT
MAY INCREASE AS FAR NORTH AS THE BIRMINGHAM AREA...AND MORE LIKELY
THE ANNISTON/GADSDEN AREAS EASTWARD TO THE GEORGIA BORDER BY EARLY
AFTERNOON. LOW-LEVEL FLOW FIELDS AND SHEAR ARE STILL SOMEWHAT
MODEST...BUT THEY ARE PROGGED TO STRENGTHEN ACROSS MUCH OF THE
WESTERN FLORIDA PANHANDLE AND CENTRAL/SOUTHERN ALABAMA DURING THE
NEXT FEW HOURS...CONTRIBUTING TO THE RISK FOR TORNADOES IN ISOLATED
SUPERCELLS. OTHERWISE...LOCALLY DAMAGING WIND GUSTS WILL REMAIN
POSSIBLE...WITH THE LARGE HAIL THREAT MUCH MORE MARGINAL.
..KERR.. 01/26/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TAE...BMX...MOB...
LAT...LON 30408806 31088794 31838777 32438763 32838681 33518633
33878608 34048551 33138537 32088522 31408539 30208617
29168629 28048770 28928809 29938807 30408806SPC 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, 9:55 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 26, 5:35 PM CST | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 5 more | 55 min |
| Jan 26, 3:30 PM CST | Tornado Watch | SPC | Dixie, Franklin, Gadsden, Jefferson, Lafayette, Leon and 4 more | 6 hr |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Florida, 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.