Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 1561

August 23, 201724 counties in Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2017, 3:14 PM EDT for 24 counties in Georgia; 13 counties in South Carolina. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Aug 23, 2017, 3:14 PM EDT (19:14 UTC)
Expired: Aug 23, 2017, 4:45 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 37 counties

Appling County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Wayne County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Charleston,SC radar (KCLX), 42 km from the middle of the area, began a volume at 19:15 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

Jacksonville, FL (KJAX), launched 12:00Z, 7.2 hours before the alert went out and 206 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: 903 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 10 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
Aug 23, 1:23 PM EDT	Mesoscale Discussion	SPC	Chester, Chesterfield, Darlington, Dillon, Fairfield, Florence and 7 more	3 hr

Nearby

Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in South Carolina, 2017 Every mesoscale discussion in 2017

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.