Alert archive / Georgia / Mesoscale Discussions in 2018

Mesoscale Discussion 161

March 20, 201815 counties in Georgia; 9 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2018, 2:48 PM EDT for 15 counties in Georgia; 9 counties in South Carolina. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 20, 2018, 2:48 PM EDT (18:48 UTC)
Expired: Mar 20, 2018, 4:15 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center

All 24 counties

Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC, Williamsburg County, SC

The radar

The Charleston,SC radar (KCLX), 87 km from the middle of the area, began a volume at 18:47 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, 6.8 hours before the alert went out and 161 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: 1315 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 8.3

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
Mar 19, 8:45 PM EDT	Mesoscale Discussion	SPC	Baldwin, Bartow, Bibb, Butts, Carroll, Chattooga and 40 more	60 min
Mar 19, 9:08 PM EDT	Tornado Watch	SPC	Baldwin, Barrow, Bartow, Bibb, Butts, Carroll and 48 more	7 hr
Mar 19, 9:51 PM EDT	Mesoscale Discussion	SPC	Carroll, Douglas, Haralson, Paulding, Polk	84 min
Mar 20, 12:32 AM EDT	Mesoscale Discussion	SPC	Bulloch, Burke, Candler, Columbia, Effingham, Jenkins and 2 more	88 min
Mar 20, 1:51 AM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 16 more	4 hr
Mar 20, 2:36 AM EDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Crawford, Glascock, Harris, Jefferson and 12 more	84 min
Mar 20, 4:54 AM EDT	Mesoscale Discussion	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Emanuel and 12 more	96 min
Mar 20, 9:50 AM EDT	Mesoscale Discussion	SPC	Camden, Charlton	55 min
Mar 20, 10:24 AM EDT	Tornado Watch	SPC	Camden, Charlton	9 hr
Mar 20, 12:05 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 23 more	55 min
Mar 20, 12:43 PM EDT	Tornado Watch	SPC	Appling, Bacon, Brantley, Bryan, Bulloch, Charlton and 13 more	7 hr
Mar 20, 1:00 PM EDT	Mesoscale Discussion	SPC	Camden, Charlton, Echols	60 min
Mar 20, 4:16 PM EDT	Mesoscale Discussion	SPC	Camden, Charlton, Echols	89 min
Mar 20, 6:10 PM EDT	Mesoscale Discussion	SPC	Chatham, Glynn, McIntosh	65 min

Nearby

Mesoscale Discussions in Georgia, 2018 Mesoscale Discussions in South Carolina, 2018 Every mesoscale discussion in 2018

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.