Alert archive / South Carolina / Mesoscale Discussions in 2019

Mesoscale Discussion 977

June 4, 201910 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2019, 4:15 PM EDT for 10 counties in Georgia; 13 counties in South Carolina. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2019, 4:15 PM EDT (20:15 UTC)
Expired: Jun 4, 2019, 5:45 PM EDT
In force: 90 min
Issued by: the Storm Prediction Center

All 23 counties

Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Screven County, GA, Allendale County, SC, Bamberg County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 17 km from the middle of the area, began a volume at 20:19 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, 8.3 hours before the alert went out and 90 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: 700 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

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
Jun 4, 12:43 PM EDT	Mesoscale Discussion	SPC	Bulloch, Burke, Candler, Effingham, Emanuel, Evans and 2 more	92 min
Jun 4, 1:18 PM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 11 more	7 hr

Nearby

Mesoscale Discussions in South Carolina, 2019 Mesoscale Discussions in Georgia, 2019 Every mesoscale discussion in 2019

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.