Alert archive / South Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 465

April 5, 201218 counties in Georgia; 37 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 6:35 PM EDT for 18 counties in Georgia; 37 counties in South Carolina. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 5, 2012, 6:35 PM EDT (22:35 UTC)
Expired
Apr 5, 2012, 8:00 PM EDT
In force
85 min
Issued by
the Storm Prediction Center
All 55 counties

Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Columbia County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jenkins County, GA, Liberty County, GA, Lincoln County, GA, Long County, GA, McIntosh County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Wayne County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chester County, SC, Clarendon County, SC, Colleton County, SC, Darlington 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, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, McCormick County, SC, Newberry County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 54 km from the middle of the area, began a volume at 22:36 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

Charleston AFB, SC (KCHS), launched 12:00Z, 10.6 hours before the alert went out and 115 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 2012-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 490 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 2012-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
490 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
1016 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
50 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
Apr 5, 1:03 PM EDTMesoscale DiscussionSPCBanks, Burke, Clarke, Columbia, Effingham, Elbert and 24 more87 min
Apr 5, 1:47 PM EDTSevere Thunderstorm WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 17 more7 hr
Apr 5, 1:54 PM EDTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 11 more96 min
Apr 5, 2:12 PM EDTMesoscale DiscussionSPCBaker, Calhoun, Chattahoochee, Clay, Coweta, Crawford and 30 more93 min
Apr 5, 2:58 PM EDTSevere Thunderstorm WatchSPCBaker, Ben Hill, Calhoun, Chattahoochee, Clay, Colquitt and 36 more6 hr
Apr 5, 3:37 PM EDTMesoscale DiscussionSPCBurke, Chatham, Columbia, Effingham, Elbert, Franklin and 11 more53 min
Apr 5, 4:49 PM EDTMesoscale DiscussionSPCAtkinson, Baker, Ben Hill, Berrien, Brooks, Calhoun and 33 more86 min
Apr 5, 7:15 PM EDTMesoscale DiscussionSPCHeard45 min

Nearby

Mesoscale Discussions in South Carolina, 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; radar from the NEXRAD Level II archive.