Alert archive / Georgia / Mesoscale Discussions in 2021
Mesoscale Discussion 2022
The Storm Prediction Center issued this mesoscale discussion at Dec 11, 2021, 5:32 PM EST for 16 counties in Georgia. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Dec 11, 2021, 5:32 PM EST (22:32 UTC)
- Expired
- Dec 11, 2021, 7:00 PM EST
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
Counties Bleckley County, GA, Burke County, GA, Columbia County, GA, Emanuel County, GA, Glascock County, GA, Houston County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Laurens County, GA, McDuffie County, GA, Richmond County, GA, Treutlen County, GA, Twiggs County, GA, Washington County, GA, Wilkinson County, GA
The radar
The Robins AFB radar (KJGX), 66 km from the middle of the area, began a volume at 22:33 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, 10.5 hours before the alert went out and 176 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
- 182 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 625 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 268 m²/s²
- 0-3 km storm-relative helicity
- 271 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
The text
As transmitted.
891
ACUS11 KWNS 112233
SWOMCD
SPC MCD 112232
SCZ000-GAZ000-120000-
Mesoscale Discussion 2022
NWS Storm Prediction Center Norman OK
0432 PM CST Sat Dec 11 2021
Areas affected...Portions of eastern Georgia
Concerning...Severe potential...Watch unlikely
Valid 112232Z - 120000Z
Probability of Watch Issuance...5 percent
SUMMARY...A brief damaging wind/tornado threat exists for the next 1
to 2 hours across eastern Georgia.
DISCUSSION...A few mini supercells have developed ahead of a line of
storms moving through eastern Georgia. One of these mini supercells
in Wilkinson county had a TDS for around 5 minutes starting around
2219Z. 0 to 1 km SRH around 150 to 200 m2/s2 at the KJGX VWP shows a
low-level shear environment favorable for a brief tornado threat to
continue. Therefore, this storm, and any additional supercells which
can develop ahead of the line, will pose a threat for a brief
tornado before the main squall line eventually overtakes these
storms.
..Bentley/Grams.. 12/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CHS...CAE...FFC...
LAT...LON 33118314 33428264 33588227 33388194 32958169 32508214
32258286 32248336 32408380 33118314SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 11, 8:34 AM EST | Mesoscale Discussion | SPC | Bartow, Catoosa, Chattooga, Floyd, Gordon, Haralson and 3 more | 86 min |
| Dec 11, 11:47 AM EST | Mesoscale Discussion | SPC | Carroll, Coweta, Fayette, Harris, Heard, Meriwether and 1 more | 118 min |
Nearby
Mesoscale Discussions in Georgia, 2021Every mesoscale discussion in 2021
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.