Alert archive / Georgia / Mesoscale Discussions in 2017
Mesoscale Discussion 1790
The Storm Prediction Center issued this mesoscale discussion at Dec 8, 2017, 6:32 PM EST for 30 counties in Georgia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 8, 2017, 6:32 PM EST (23:32 UTC)
- Expired
- Dec 8, 2017, 9:30 PM EST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 30 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Fulton County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Hart County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Stephens County, GA, Walton County, GA, White County, GA
The radar
The Atlanta radar (KFFC), 92 km from the middle of the area, began a volume at 23:36 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 nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.5 hours before the alert went out and 90 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 735 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 423 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Dec 8, 8:55 AM EST | Mesoscale Discussion | SPC | Banks, Bartow, Carroll, Chattooga, Cherokee, Cobb and 16 more | 3 hr |
| Dec 8, 12:06 PM EST | Mesoscale Discussion | SPC | Rabun, Towns, Union | 4 hr |
Nearby
Mesoscale Discussions in Georgia, 2017Every 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.