Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 337
The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2012, 4:03 PM CDT for 16 counties in Alabama; Carroll County, Haralson County, Heard County, Georgia. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2012, 4:03 PM CDT (21:03 UTC)
- Expired
- Mar 23, 2012, 5:30 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
Counties Autauga County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Randolph County, AL, Talladega County, AL, Tallapoosa County, AL, Carroll County, GA, Haralson County, GA, Heard County, GA
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 9.1 hours before the alert went out and 82 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
- 490 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 500 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
136 ACUS11 KWNS 232104 SWOMCD SPC MCD 232103 GAZ000-ALZ000-232230- MESOSCALE DISCUSSION 0337 NWS STORM PREDICTION CENTER NORMAN OK 0403 PM CDT FRI MAR 23 2012 AREAS AFFECTED...EASTERN AL INTO FAR WESTERN GA CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 232103Z - 232230Z A SUPERCELL/BRIEF TORNADO THREAT MAY EXIST THROUGH LATE AFTERNOON INTO EARLY/MID EVENING ESPECIALLY ACROSS EAST-CENTRAL PORTIONS OF AL/PERHAPS FAR WESTERN GA. CURRENT EXPECTATIONS ARE FOR THE OVERALL THREAT TO REMAIN MARGINAL/ISOLATED...BUT CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED. SHOWERS AND SOME TSTMS HAVE BEEN OCCURRING ACROSS OVER THE PAST FEW HOURS ACROSS EASTERN AL/NORTHWEST GA WITHIN A ZONE OF DIFFERENTIAL HEATING/LOW LEVEL CONFLUENCE. IN THE WAKE OF EARLY DAY CLOUD COVER/SCATTERED PRECIPITATION...THE AIRMASS HAS BECOME MODERATELY UNSTABLE AS SURFACE DEWPOINTS REMAIN IN THE MIDDLE/UPPER 60S F. WHILE CONVERGENCE/FLOW JUST ABOVE THE SURFACE IS EXPECTED TO SLOWLY ABATE INTO THIS EVENING...LATEST WSR-88D VWP DATA FROM MAXWELL AIR FORCE BASE IS INDICATIVE OF 0-1 KM SRH AROUND 150 M2/S2 WHEN ADJUSTED FOR THE WEAK SOUTH-SOUTHEASTERLY WINDS THAT CURRENTLY EXIST ACROSS EAST-CENTRAL AL. THUS...A SUPERCELL/BRIEF TORNADO THREAT CANNOT BE RULED OUT OVER THE NEXT FEW HOURS...ALTHOUGH THE OVERALL THREAT SHOULD REMAIN RELATIVELY MARGINAL/ISOLATED. ..GUYER.. 03/23/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...BMX...MOB... LAT...LON 31788681 32548713 34278556 33638492 32208547 31788681
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 10:19 AM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Coffee, Dale, Geneva, Henry and 2 more | 56 min |
Nearby
Mesoscale 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.