Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 441
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2011, 5:30 PM EDT for 32 counties in Georgia. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2011, 5:30 PM EDT (21:30 UTC)
- Expired
- Apr 15, 2011, 6:30 PM EDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 32 counties
Barrow County, GA, Bartow County, GA, Butts County, GA, Carroll County, GA, Cherokee County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gwinnett County, GA, Hall County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lamar County, GA, Lumpkin County, GA, Meriwether County, GA, Monroe County, GA, Newton County, GA, Paulding County, GA, Pickens County, GA, Pike County, GA, Rockdale County, GA, Spalding County, GA, Troup County, GA, Walton County, GA
The radar
The Atlanta radar (KFFC), 50 km from the middle of the area, began a volume at 21:30 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, 9.5 hours before the alert went out and 49 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
- 1094 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
227
ACUS11 KWNS 152131
SWOMCD
SPC MCD 152130
GAZ000-152230-
MESOSCALE DISCUSSION 0441
NWS STORM PREDICTION CENTER NORMAN OK
0430 PM CDT FRI APR 15 2011
AREAS AFFECTED...N-CNTRL/CNTRL/W-CNTRL GA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 152130Z - 152230Z
THE THREAT FOR SEVERE TSTMS IS INCREASING ACROSS
N-CNTRL/CNTRL/W-CNTRL GA...AND A WW MAY BECOME NECESSARY.
AN AREA OF MLCAPE VALUES OF 500-1000 J/KG WILL CONTINUE EXPANDING
NWD ACROSS GA DURING THE NEXT COUPLE HOURS FOLLOWING THE PASSAGE OF
A WARM FRONT. THIS WILL OCCUR IN ASSOCIATION WITH THE INFLUX OF GULF
MOISTURE AT THE ERN PERIPHERY OF THE WARM SECTOR. RECENT
SUPERCELLULAR STRUCTURE OVER WRN PICKENS COUNTY REFLECTS THE STRONG
DEEP-LAYER WIND SHEAR IN PLACE. ADDITIONAL CONVECTION WILL LIKELY
DEVELOP WITHIN THE EXPANDING WARM SECTOR AND NEAR THE WARM
FRONT...AND WIND PROFILES WILL REMAIN FAVORABLE FOR SUPERCELLS.
LARGE HAIL AND DMGG WINDS WILL BE THE PRIMARY THREATS...THOUGH
STRONG LOW-LEVEL WIND SHEAR WILL PROMOTE A THREAT FOR TORNADOES.
..COHEN.. 04/15/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GSP...FFC...
LAT...LON 33538524 34378494 34868448 34578354 33778353 32878390
32968506 33538524SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 2:30 PM EDT | Mesoscale Discussion | SPC | Carroll, Haralson, Heard, Polk | 2 hr |
| Apr 15, 5:46 PM EDT | Tornado Watch | SPC | Banks, Barrow, Bartow, Butts, Carroll, Chattooga and 45 more | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 2011Every mesoscale discussion in 2011
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.