Alert archive / Georgia / Mesoscale Discussions in 2018
Mesoscale Discussion 1507
The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2018, 5:34 PM EDT for 15 counties in Georgia; 11 counties in South Carolina. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Sep 27, 2018, 5:34 PM EDT (21:34 UTC)
- Expired
- Sep 27, 2018, 7:30 PM EDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 26 counties
Banks County, GA, Barrow County, GA, Clarke County, GA, Elbert County, GA, Franklin County, GA, Greene County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Madison County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Taliaferro County, GA, Wilkes County, GA, Abbeville County, SC, Anderson County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Laurens County, SC, McCormick County, SC, Newberry County, SC, Saluda County, SC, Union County, SC
The radar
The Greer radar (KGSP), 106 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 187 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.
- Mixed-layer CAPE
- 310 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 601 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 2:20 PM EDT | Mesoscale Discussion | SPC | Columbia, Richmond | 2 hr |
| Sep 27, 3:03 PM EDT | Mesoscale Discussion | SPC | Baker, Baldwin, Banks, Barrow, Bartow, Ben Hill and 93 more | 2 hr |
| Sep 27, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Hart, Stephens | 4 hr |
| Sep 27, 5:47 PM EDT | Mesoscale Discussion | SPC | Chesterfield, Darlington, Dillon, Lee, Marlboro | 88 min |
| Sep 27, 7:34 PM EDT | Mesoscale Discussion | SPC | Cherokee, Greenville, Greenwood, Laurens, Newberry, Spartanburg and 2 more | 56 min |
Nearby
Mesoscale Discussions in Georgia, 2018Mesoscale Discussions in South Carolina, 2018Every 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.