Alert archive / Georgia / Mesoscale Discussions in 2020

Mesoscale Discussion 44

January 11, 20208 counties in Georgia; 7 counties in North Carolina; 4 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2020, 4:48 PM EST for 8 counties in Georgia; 7 counties in North Carolina; 4 counties in South Carolina. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2020, 4:48 PM EST (21:48 UTC)
Expired: Jan 11, 2020, 6:45 PM EST
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Banks County, GA, Elbert County, GA, Franklin County, GA, Habersham County, GA, Hart County, GA, Madison County, GA, Rabun County, GA, Stephens County, GA, Buncombe County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Polk County, NC, Transylvania County, NC, Anderson County, SC, Greenville County, SC, Oconee County, SC, Pickens County, SC

The radar

The Greer radar (KGSP), 78 km from the middle of the area, began a volume at 21:52 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.

Tornado Watch 17Jan 11, 5:35 PM EST

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.8 hours before the alert went out and 203 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: 13 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 557 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 417 m²/s²
0-3 km storm-relative helicity: 450 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
Jan 11, 10:28 AM EST	Mesoscale Discussion	SPC	Catoosa, Dade, Walker	92 min
Jan 11, 1:20 PM EST	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 17 more	85 min
Jan 11, 1:42 PM EST	Tornado Watch	SPC	Banks, Barrow, Bartow, Bibb, Butts, Carroll and 61 more	7 hr
Jan 11, 3:26 PM EST	Mesoscale Discussion	SPC	Baker, Calhoun, Clay, Decatur, Early, Miller and 4 more	94 min
Jan 11, 3:44 PM EST	Tornado Watch	SPC	Baker, Calhoun, Clay, Decatur, Dougherty, Early and 9 more	5 hr
Jan 11, 4:16 PM EST	Mesoscale Discussion	SPC	Bartow, Carroll, Chattahoochee, Cherokee, Clayton, Cobb and 36 more	89 min
Jan 11, 5:38 PM EST	Tornado Watch	SPC	Baldwin, Bleckley, Burke, Clarke, Columbia, Dodge and 34 more	6 hr
Jan 11, 6:21 PM EST	Mesoscale Discussion	SPC	Baker, Brooks, Calhoun, Colquitt, Cook, Decatur and 13 more	114 min
Jan 11, 6:36 PM EST	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 63 more	84 min

Nearby

Mesoscale Discussions in Georgia, 2020 Mesoscale Discussions in North Carolina, 2020 Mesoscale Discussions in South Carolina, 2020 Every mesoscale discussion in 2020

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.