Alert archive / Georgia / Mesoscale Discussions in 2005

Mesoscale Discussion 930

May 20, 20055 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 12:55 PM CDT for 5 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
May 20, 2005, 12:55 PM CDT (17:55 UTC)
Expired
May 20, 2005, 2:00 PM CDT
In force
65 min
Issued by
the Storm Prediction Center
All 218 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Colbert County, AL, Conecuh County, AL, Coosa County, AL, Crenshaw County, AL, Cullman County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Lee County, AL, Limestone County, AL, Lowndes County, AL, Macon County, AL, Madison County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Monroe County, AL, Montgomery County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Winston County, AL, Appling County, GA, Bacon County, GA, Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Ben Hill County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Carroll County, GA, Catoosa County, GA, Chattahoochee County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Columbia County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Elbert County, GA, Emanuel County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Glascock County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jeff Davis County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lincoln County, GA, Macon County, GA, Madison County, GA, Marion County, GA, McDuffie County, GA, Meriwether County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Murray County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Quitman 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, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walker County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Whitfield County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Alcorn County, MS, Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Covington County, MS, Grenada County, MS, Holmes County, MS, Itawamba County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, McCormick County, SC, Franklin County, TN, Giles County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Perry County, TN, Wayne County, TN

The radar

The Birmingham radar (KBMX), 60 km from the middle of the area, began a volume at 17:57 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, 5.9 hours before the alert went out and 59 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 2005-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1086 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 2005-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 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
1086 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1017 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 4:18 AM CDTMesoscale DiscussionSPCJackson57 min
May 20, 7:42 AM CDTMesoscale DiscussionSPCDeKalb, Jackson, Limestone, Madison93 min
May 20, 8:40 AM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 24 more7 hr
May 20, 3:10 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Butler, Chambers and 36 more8 hr
May 20, 6:44 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 40 more91 min
May 20, 1:00 AM CDTSevere Thunderstorm WatchSPCHart7 hr
May 20, 1:30 AM CDTSevere Thunderstorm WatchSPCBanks, Barrow, Catoosa, Cherokee, Dade, Dawson and 20 more8 hr
May 20, 4:52 AM CDTMesoscale DiscussionSPCBaldwin, Bleckley, Burke, Candler, Columbia, Emanuel and 18 more53 min
May 20, 12:16 PM CDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 11 more29 min
May 20, 12:20 PM CDTSevere Thunderstorm WatchSPCAppling, Bacon, Bryan, Bulloch, Burke, Candler and 15 more7 hr
May 20, 1:43 PM CDTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Burke, Candler and 14 more62 min
May 20, 3:40 PM CDTMesoscale DiscussionSPCAppling, Bacon, Bryan, Bulloch, Candler, Chatham and 10 more95 min
May 20, 4:51 PM CDTMesoscale DiscussionSPCAttala, Bolivar, Carroll, Grenada, Hinds, Holmes and 14 more114 min
May 20, 5:30 PM CDTSevere Thunderstorm WatchSPCAdams, Attala, Carroll, Claiborne, Copiah, Covington and 19 more8 hr
May 19, 11:56 PM CDTMesoscale DiscussionSPCCherokee, Greenville, Pickens, Spartanburg, York2 hr
May 19, 11:58 PM CDTMesoscale DiscussionSPCCherokee, Greenville, Pickens, Spartanburg, York2 hr
May 19, 8:31 PM CDTMesoscale DiscussionSPCClaiborne, Clay, Fentress, Hancock, Jackson, Macon and 7 more89 min
May 19, 8:50 PM CDTSevere Thunderstorm WatchSPCCheatham, Davidson, Dickson, Henry, Houston, Montgomery and 3 more5 hr
May 19, 9:05 PM CDTSevere Thunderstorm WatchSPCAnderson, Campbell, Carter, Claiborne, Clay, Davidson and 21 more5 hr
May 20, 2:45 PM CDTMesoscale DiscussionSPCBledsoe, Blount, Bradley, Cumberland, Grundy, Hamilton and 10 more60 min

Nearby

Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Mississippi, 2005Every mesoscale discussion in 2005

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.