Alert archive / South Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 907

May 20, 20064 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2006, 4:38 PM EDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 20, 2006, 4:38 PM EDT (20:38 UTC)
Expired
May 20, 2006, 6:15 PM EDT
In force
97 min
Issued by
the Storm Prediction Center
All 105 counties

Banks County, GA, Catoosa County, GA, Dade County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hart County, GA, Lumpkin County, GA, Murray County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Anson County, NC, Brunswick County, NC, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Columbus County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Robeson County, NC, Rutherford County, NC, Scotland County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Anderson County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Edgefield County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Greenville County, SC, Greenwood County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Orangeburg County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cumberland County, TN, Hamilton County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Van Buren County, TN

The radar

The Columbia radar (KCAE), 65 km from the middle of the area, began a volume at 20:38 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

Charleston AFB, SC (KCHS), launched 12:00Z, 8.6 hours before the alert went out and 215 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, Charleston AFB, SC at 12:00Z on 2006-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 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, Charleston AFB, SC at 12:00Z on 2006-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 258 square meters per square second.19395878Sfc1 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
8 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
2105 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
258 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, 3:57 AM EDTMesoscale DiscussionSPCRabun, Towns63 min
May 20, 12:40 PM EDTMesoscale DiscussionSPCBanks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more2 hr
May 20, 1:19 PM EDTSevere Thunderstorm WatchSPCBanks, Catoosa, Dade, Dawson, Elbert, Fannin and 16 more8 hr
May 20, 5:13 PM EDTSevere Thunderstorm WatchSPCBarrow, Bartow, Burke, Chattooga, Cherokee, Clarke and 25 more4 hr
May 20, 6:45 PM EDTMesoscale DiscussionSPCBanks, Catoosa, Chattooga, Dade, Dawson, Elbert and 18 more90 min
May 20, 12:07 AM EDTMesoscale DiscussionSPCCherokee, Clay, Graham, Macon, Swain23 min
May 20, 12:09 AM EDTSevere Thunderstorm WatchSPCCherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more6 hr
May 20, 3:04 PM EDTMesoscale DiscussionSPCAnson, Cabarrus, Cleveland, Gaston, Hoke, Lincoln and 7 more86 min
May 20, 3:34 PM EDTSevere Thunderstorm WatchSPCAnson, Bladen, Brunswick, Columbus, New Hanover, Pender and 3 more7 hr
May 20, 7:31 PM EDTMesoscale DiscussionSPCCarroll, Chester, Crockett, Decatur, Dyer, Fayette and 18 more29 min
May 20, 7:59 PM EDTSevere Thunderstorm WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 24 more6 hr

Nearby

Mesoscale Discussions in South Carolina, 2006Mesoscale Discussions in North Carolina, 2006Mesoscale Discussions in Georgia, 2006Every mesoscale discussion in 2006

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.