Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 730
The Storm Prediction Center issued this mesoscale discussion at May 6, 2012, 12:04 PM CDT for 4 states. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2012, 12:04 PM CDT (17:04 UTC)
- Expired
- May 6, 2012, 1:30 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 78 counties
Barbour County, AL, Bullock County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Escambia County, AL, Geneva County, AL, Greene County, AL, Henry County, AL, Houston County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Pike County, AL, Russell County, AL, Sumter County, AL, Wilcox County, AL, Calhoun County, FL, Holmes County, FL, Jackson County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Clayton County, GA, Coweta County, GA, Dougherty County, GA, Early County, GA, Fayette County, GA, Harris County, GA, Henry County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Muscogee County, GA, Pike County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Upson County, GA, Webster County, GA, Attala County, MS, Carroll County, MS, Choctaw County, MS, Clarke County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Scott County, MS, Tallahatchie County, MS, Webster County, MS, Winston County, MS
The radar
The Birmingham radar (KBMX), 62 km from the middle of the area, began a volume at 17:07 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, 5.1 hours before the alert went out and 63 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
- 2479 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 912 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
496
ACUS11 KWNS 061704
SWOMCD
SPC MCD 061704
GAZ000-FLZ000-ALZ000-MSZ000-061830-
MESOSCALE DISCUSSION 0730
NWS STORM PREDICTION CENTER NORMAN OK
1204 PM CDT SUN MAY 06 2012
AREAS AFFECTED...WRN GA...FL PANHANDLE...SRN AL...CNTRL MS
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 061704Z - 061830Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...THUNDERSTORMS ARE EXPECTED TO INCREASE IN AREAL
COVERAGE/INTENSITY FROM WRN GA...ACROSS SRN AL INTO CNTRL MS OVER
THE NEXT FEW HOURS.
DISCUSSION...REMNANT MCS THAT HAS DRIFTED ACROSS THE TN VALLEY INTO
CNTRL AL HAS FORCED AN EFFECTIVE BOUNDARY INTO WRN GA...ARCING
ACROSS SRN AL INTO CNTRL MS. STRONG HEATING ALONG/SOUTH OF THIS
FEATURE HAS CONTRIBUTED TO A DEEPENING BOUNDARY LAYER WITH SFC-3KM
LAPSE RATES NOW APPROACHING 8 C/KM. WHAT LITTLE INHIBITION THAT WAS
OBSERVED THIS MORNING IS EFFECTIVELY GONE AND SFC PARCELS SHOULD
FREELY CONVECT ALONG THE AFOREMENTIONED OUTFLOW GIVEN THE
MOIST/UNSTABLE AIRMASS. IN ADDITION...MID LEVEL TEMPERATURES ARE
QUITE COOL ACROSS THIS REGION WITH 500MB VALUES BETWEEN MINUS
12-14C. THIS SHOULD CONTRIBUTE TO ROBUST UPDRAFTS DESPITE THE
MARGINAL DEEP LAYER SHEAR. LATEST THINKING IS TSTMS WILL CONTINUE
TO DEVELOP ALONG THE BOUNDARY AND UPWARD GROWTH/STORM MERGERS WILL
LIKELY AID IN A FAIRLY EXTENSIVE ARCING CORRIDOR OF CONVECTION THAT
SHOULD PROPAGATE SWD INTO THE MID-LATE AFTERNOON HOURS. HAIL/WIND
ARE THE PRIMARY THREATS WITH THIS ACTIVITY.
..DARROW.. 05/06/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FFC...TAE...BMX...MOB...MEG...JAN...
LAT...LON 33628414 31518392 30288522 31298801 33059067 34269004
33518910 32238683 32148525 33538484 33628414SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 8 more | 5 hr |
| May 6, 1:38 PM CDT | Mesoscale Discussion | SPC | Sumter | 2 hr |
| May 6, 4:41 PM CDT | Mesoscale Discussion | SPC | Baldwin | 64 min |
Nearby
Mesoscale Discussions in Georgia, 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.