Alert archive / Georgia / Mesoscale Discussions in 2021

Mesoscale Discussion 500

May 3, 202144 counties in Alabama; 51 counties in Georgia; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 3, 2021, 4:00 PM CDT for 44 counties in Alabama; 51 counties in Georgia; 4 counties in Mississippi. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 3, 2021, 4:00 PM CDT (21:00 UTC)
Expired
May 3, 2021, 5:30 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 128...130
All 99 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Choctaw County, AL, Clarke 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, Greene County, AL, Hale County, AL, Henry County, AL, Houston County, AL, Jefferson County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Washington County, AL, Wilcox County, AL, Baldwin County, GA, Bibb County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clay County, GA, Clayton County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Fulton County, GA, Greene County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Peach County, GA, Pike County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Webster County, GA, Wilkinson County, GA, Clarke County, MS, Kemper County, MS, Lauderdale County, MS, Wayne County, MS

The radar

The Maxwell AFB radar (KMXX), 21 km from the middle of the area, began a volume at 21:00 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, 9.0 hours before the alert went out and 114 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.

Skew-T log-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2021-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1106 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2021-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 313 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1106 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
552 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
313 m²/s²
0-3 km storm-relative helicity
363 m²/s²
Significant tornado parameter
1.7
Supercell composite
11.4

Open this sounding in Storm Lab

The text

As transmitted.

992 
ACUS11 KWNS 032100
SWOMCD
SPC MCD 032100 
GAZ000-ALZ000-MSZ000-032230-

Mesoscale Discussion 0500
NWS Storm Prediction Center Norman OK
0400 PM CDT Mon May 03 2021

Areas affected...parts of eastern Mississippi into much of central
Alabama and central Georgia

Concerning...Severe Thunderstorm Watch 128...130...

Valid 032100Z - 032230Z

The severe weather threat for Severe Thunderstorm Watch 128, 130
continues.

SUMMARY...The severe threat continues across Severe Thunderstorm
Watches 128 and 130. Damaging gusts and large hail remain the
primary threats

DISCUSSION...Several multicellular clusters and occasional transient
supercells have developed and traversed Severe Thunderstorm Watches
128 and 130 over the past few hours. A couple instances of damaging
gusts and marginally severe hail have been noted. Widespread
2000-3000 J/kg MLCAPE, driven primarily by deep low-level moisture,
along with 30-40 kts of effective bulk shear will continue to
support a couple damaging gusts or marginally severe hail through
the afternoon. This threat is expected to continue until sunset,
when thunderstorm coverage and intensity will likely be on the wane.

..Squitieri/Grams.. 05/03/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...FFC...TAE...BMX...MOB...JAN...

LAT...LON   31958899 32648878 33478792 33798571 33948404 33758304
            33348268 32958296 32228381 31578446 31168527 31048654
            31108750 31368871 31958899

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 2, 11:45 PM CDTMesoscale DiscussionSPCColbert, Franklin, Marion2 hr
May 3, 9:29 AM CDTTornado WatchSPCBullock, Chambers, Clay, Cleburne, Coosa, Elmore and 6 more5 hr
May 3, 10:38 AM CDTMesoscale DiscussionSPCButler, Clarke, Conecuh, Covington, Crenshaw, Dallas and 7 more97 min
May 3, 11:47 AM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 46 more10 hr
May 3, 9:04 AM CDTMesoscale DiscussionSPCBarrow, Butts, Carroll, Clayton, Cobb, Coweta and 15 more86 min
May 3, 10:20 AM CDTMesoscale DiscussionSPCClayton, DeKalb, Gwinnett, Rockdale55 min
May 3, 12:03 PM CDTMesoscale DiscussionSPCBarrow, Butts, Clarke, Clayton, Cobb, Columbia and 30 more87 min
May 3, 12:25 PM CDTTornado WatchSPCBurke, Columbia, Elbert, Lincoln, McDuffie, Richmond6 hr
May 3, 2:05 PM CDTMesoscale DiscussionSPCBaldwin, Barrow, Bibb, Butts, Carroll, Chattahoochee and 36 more55 min
May 3, 2:23 PM CDTSevere Thunderstorm WatchSPCBaldwin, Barrow, Bibb, Butts, Carroll, Chattahoochee and 55 more6 hr
May 3, 3:26 PM CDTMesoscale DiscussionSPCRichmond94 min
May 3, 1:56 AM CDTMesoscale DiscussionSPCAlcorn, Benton, DeSoto, Marshall, Tippah3 hr

Nearby

Mesoscale Discussions in Georgia, 2021Mesoscale Discussions in Alabama, 2021Mesoscale Discussions in Mississippi, 2021Every mesoscale discussion in 2021

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.