Alert archive / South Carolina / Mesoscale Discussions in 2024

Mesoscale Discussion 1839

August 6, 20246 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2024, 4:41 AM EDT for 6 counties in South Carolina. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Aug 6, 2024, 4:41 AM EDT (08:41 UTC)
Expired: Aug 6, 2024, 6:15 AM EDT
In force: 94 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 602

Counties Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC

The radar

The Charleston,SC radar (KCLX), 104 km from the middle of the area, began a volume at 08:44 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.

Tornado Watch 603Aug 6, 6:55 AM EDT

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 8.7 hours before the alert went out and 10 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: 178 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 620 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 5, 8:11 PM EDT	Mesoscale Discussion	SPC	Beaufort, Jasper	2 hr
Aug 5, 11:35 PM EDT	Mesoscale Discussion	SPC	Beaufort, Charleston, Jasper	85 min
Aug 6, 12:50 AM EDT	Tornado Watch	SPC	Beaufort, Berkeley, Charleston, Colleton, Dorchester, Georgetown and 1 more	6 hr
Aug 6, 6:57 AM EDT	Tornado Watch	SPC	Berkeley, Charleston, Dorchester, Florence, Georgetown, Horry and 2 more	10 hr
Aug 6, 8:57 AM EDT	Mesoscale Discussion	SPC	Berkeley, Charleston, Dorchester, Georgetown, Horry, Williamsburg	93 min
Aug 6, 1:15 PM EDT	Mesoscale Discussion	SPC	Charleston, Georgetown, Horry, Marion, Williamsburg	30 min
Aug 6, 4:38 PM EDT	Tornado Watch	SPC	Florence, Georgetown, Horry, Marion, Williamsburg	8 hr

Nearby

Mesoscale Discussions in South Carolina, 2024 Every mesoscale discussion in 2024

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.