Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 418

April 3, 201760 counties in Georgia; 11 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2017, 10:07 AM EDT for 60 counties in Georgia; 11 counties in South Carolina. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2017, 10:07 AM EDT (14:07 UTC)
Expired: Apr 3, 2017, 11:30 AM EDT
In force: 83 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 71 counties

Baldwin County, GA, Banks County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Bulloch County, GA, Burke County, GA, Butts County, GA, Candler County, GA, Clarke County, GA, Clayton County, GA, Columbia County, GA, DeKalb County, GA, Effingham County, GA, Elbert County, GA, Emanuel County, GA, Evans County, GA, Franklin County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Hancock County, GA, Hart County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Putnam County, GA, Richmond County, GA, Rockdale County, GA, Screven County, GA, Stephens County, GA, Taliaferro County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, White County, GA, Wilkes County, GA, Wilkinson County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Anderson County, SC, Barnwell County, SC, Edgefield County, SC, Greenwood County, SC, Hampton County, SC, McCormick County, SC, Oconee County, SC, Saluda County, SC

The radar

The Robins AFB radar (KJGX), 94 km from the middle of the area, began a volume at 14:11 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 2.1 hours before the alert went out and 177 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: 26 J/kg
Mixed-layer CIN: -350 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 317 m²/s²
0-3 km storm-relative helicity: 392 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Apr 3, 10:25 AM EDT	Mesoscale Discussion	SPC	Baker, Butts, Calhoun, Carroll, Chattahoochee, Clay and 30 more	65 min
Apr 3, 10:50 AM EDT	Severe Thunderstorm Watch	SPC	Baker, Baldwin, Barrow, Ben Hill, Berrien, Bibb and 92 more	7 hr
Apr 3, 1:42 PM EDT	Mesoscale Discussion	SPC	Appling, Bryan, Bulloch, Burke, Candler, Columbia and 24 more	63 min
Apr 3, 2:07 PM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Baldwin, Bleckley, Bryan and 45 more	6 hr
Apr 3, 6:41 PM EDT	Mesoscale Discussion	SPC	Chatham, McIntosh	64 min
Apr 3, 4:00 PM EDT	Mesoscale Discussion	SPC	Berkeley, Chesterfield, Clarendon, Darlington, Dillon, Dorchester and 8 more	90 min
Apr 3, 4:36 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Berkeley, Charleston, Colleton, Darlington, Dillon and 7 more	4 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.