Alert archive / Georgia / Mesoscale Discussions in 2021
Mesoscale Discussion 1011
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2021, 2:13 PM EDT for 4 counties in Georgia. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2021, 2:13 PM EDT (18:13 UTC)
- Expired
- Jun 19, 2021, 3:15 PM EDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 285
Counties Calhoun County, GA, Clay County, GA, Early County, GA, Randolph County, GA
The radar
The Ft Rucker radar (KEOX), 58 km from the middle of the area, began a volume at 18:12 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.2 hours before the alert went out and 141 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
- 1367 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 747 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 315 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
The text
As transmitted.
632 ACUS11 KWNS 191813 SWOMCD SPC MCD 191813 GAZ000-ALZ000-191915- Mesoscale Discussion 1011 NWS Storm Prediction Center Norman OK 0113 PM CDT Sat Jun 19 2021 Areas affected...southwest GA Concerning...Tornado Watch 285... Valid 191813Z - 191915Z The severe weather threat for Tornado Watch 285 continues. SUMMARY...Several supercells are developing in the warm sector across southwest GA. The risk for a couple of tornadoes is increasing with potential perhaps peaking between now (210pm EDT) and 4pm EDT. DISCUSSION...Radar/satellite imagery indicates the development of several supercells in a destabilizing warm sector near the southeast AL/southwest GA border early this afternoon. KEOX VAD data indicates around 200 m2/s2 0-1km SRH per observed storm motions. A maritime warm front is draped across southwest GA with mid 80s deg F temperatures and southerly flow located to its south, whereas upper 70s and backed east-southeasterly surface flow is located to the north of the boundary. As storms interact with the vorticity-rich zone along the maritime warm front, it seems tornado potential with the supercells will be greatest in the vicinity of the boundary. Additional storms are developing to the south of a storm with a history of a tornado, and these storms will likely move north into the warm frontal zone and potentially pose a tornado risk. ..Smith.. 06/19/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FFC...TAE... LAT...LON 31758497 31218524 31108497 31688445 31948456 31758497
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 10:33 AM EDT | Tornado Watch | SPC | Calhoun, Chattahoochee, Clay, Early, Harris, Macon and 13 more | 9 hr |
| Jun 19, 4:33 PM EDT | Mesoscale Discussion | SPC | Ben Hill, Clay, Coffee, Crisp, Dodge, Dooly and 15 more | 87 min |
| Jun 19, 7:22 PM EDT | Mesoscale Discussion | SPC | Baker, Calhoun, Chattahoochee, Clay, Decatur, Dougherty and 17 more | 83 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.