Alert archive / South Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 725

May 11, 201113 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 3:34 AM EDT for 13 counties in South Carolina. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 11, 2011, 3:34 AM EDT (07:34 UTC)
Expired: May 11, 2011, 4:30 AM EDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Berkeley County, SC, Charleston County, SC, Chesterfield County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC

The radar

The Columbia radar (KCAE), 127 km from the middle of the area, began a volume at 07:35 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 00:00Z, 7.6 hours before the alert went out and 68 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2852 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 899 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 14.5

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.

Issued	Product	Office	Counties	Lasted
May 10, 9:01 PM EDT	Mesoscale Discussion	SPC	Berkeley, Calhoun, Cherokee, Chester, Chesterfield, Clarendon and 19 more	59 min
May 10, 10:18 PM EDT	Mesoscale Discussion	SPC	Anderson, Cherokee, Greenville, Oconee, Pickens, Spartanburg and 1 more	27 min
May 10, 10:42 PM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Chester, Greenville, Laurens, Spartanburg, Union and 1 more	4 hr
May 11, 12:14 AM EDT	Mesoscale Discussion	SPC	Anderson, Cherokee, Chester, Fairfield, Greenville, Lancaster and 5 more	61 min
May 11, 12:41 AM EDT	Severe Thunderstorm Watch	SPC	Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Clarendon and 11 more	3 hr
May 11, 1:35 AM EDT	Mesoscale Discussion	SPC	Berkeley, Charleston, Darlington, Dorchester, Florence, Georgetown and 2 more	25 min
May 11, 1:41 AM EDT	Severe Thunderstorm Watch	SPC	Berkeley, Charleston, Darlington, Dillon, Dorchester, Florence and 5 more	3 hr
May 11, 2:37 AM EDT	Mesoscale Discussion	SPC	Cherokee, Chester, Greenville, Laurens, Spartanburg, Union and 1 more	23 min
May 11, 6:06 PM EDT	Mesoscale Discussion	SPC	Abbeville, Anderson, Greenville, Greenwood, McCormick, Oconee and 1 more	54 min

Nearby

Mesoscale Discussions in South Carolina, 2011 Every mesoscale discussion in 2011

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.