Alert archive / Georgia / Mesoscale Discussions in 2018

Mesoscale Discussion 154

March 20, 201818 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 20, 2018, 2:36 AM EDT for 18 counties in Georgia. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Mar 20, 2018, 2:36 AM EDT (06:36 UTC)
Expired: Mar 20, 2018, 4:00 AM EDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Baldwin County, GA, Bibb County, GA, Crawford County, GA, Glascock County, GA, Harris County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Meriwether County, GA, Monroe County, GA, Peach County, GA, Pike County, GA, Talbot County, GA, Twiggs County, GA, Upson County, GA, Washington County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 41 km from the middle of the area, began a volume at 06:34 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 6.6 hours before the alert went out and 91 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: 184 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 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, 2:48 PM EDT	Mesoscale Discussion	SPC	Brantley, Bryan, Camden, Charlton, Chatham, Clinch and 9 more	87 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 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.