Alert archive / South Carolina / Mesoscale Discussions in 2019

Mesoscale Discussion 617

May 12, 20196 counties in Georgia; Columbus County, North Carolina; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at May 12, 2019, 11:50 AM EDT for 6 counties in Georgia; Columbus County, North Carolina; 13 counties in South Carolina. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: May 12, 2019, 11:50 AM EDT (15:50 UTC)
Expired: May 12, 2019, 1:15 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Bryan County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Liberty County, GA, Tattnall County, GA, Columbus County, NC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 102 km from the middle of the area, began a volume at 15:50 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.

Severe Thunderstorm Watch 164May 12, 12:40 PM EDT

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 3.8 hours before the alert went out and 324 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: 8 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 12, 9:39 AM EDT	Mesoscale Discussion	SPC	Baker, Calhoun, Decatur, Dougherty, Early, Grady and 5 more	2 hr
May 12, 9:59 AM EDT	Severe Thunderstorm Watch	SPC	Baker, Calhoun, Clay, Decatur, Dougherty, Early and 7 more	5 hr
May 12, 12:11 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 43 more	64 min
May 12, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 46 more	6 hr
May 12, 3:04 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 38 more	56 min
May 12, 4:23 PM EDT	Mesoscale Discussion	SPC	Brantley, Bryan, Bulloch, Camden, Charlton, Chatham and 6 more	2 hr
May 12, 3:37 PM EDT	Mesoscale Discussion	SPC	Alleghany, Rockingham, Stokes, Surry	113 min

Nearby

Mesoscale Discussions in South Carolina, 2019 Mesoscale Discussions in Georgia, 2019 Mesoscale Discussions in North Carolina, 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.