Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 446
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2011, 8:52 PM EDT for 46 counties in Georgia. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2011, 8:52 PM EDT (00:52 UTC)
- Expired
- Apr 15, 2011, 9:45 PM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 46 counties
Baldwin County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Clarke County, GA, Clayton County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Dooly County, GA, Fayette County, GA, Fulton County, GA, Greene County, GA, Gwinnett County, GA, Hancock County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Washington County, GA, Wilkinson County, GA
The radar
The Robins AFB radar (KJGX), 50 km from the middle of the area, began a volume at 00:55 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 00:00Z, 0.9 hours before the alert went out and 83 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
- 406 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1138 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 373 m²/s²
- 0-3 km storm-relative helicity
- 566 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 11.3
The text
As transmitted, in the capitals the NWS used until 2016.
774
ACUS11 KWNS 160053
SWOMCD
SPC MCD 160052
GAZ000-160145-
MESOSCALE DISCUSSION 0446
NWS STORM PREDICTION CENTER NORMAN OK
0752 PM CDT FRI APR 15 2011
AREAS AFFECTED...CNTRL GA
CONCERNING...TORNADO WATCH 145...
VALID 160052Z - 160145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 145 CONTINUES.
AS THE THREAT FOR SEVERE STORMS AND TORNADOES SHIFTS EWD ACROSS
CNTRL GA...A TORNADO WATCH REPLACING WW145 WILL BE NEEDED COVERING
MUCH OF CNTRL GA. THIS THREAT WILL PERSIST INTO THE OVERNIGHT HOURS
AS INTENSE SUPERCELLS OVER AL TRACK EWD TOWARD GA...AND STRONG
DEEP-LAYER AND LOW-LEVEL WIND SHEAR AND MODEST INSTABILITY SUPPORT
SUPERCELLS AND TORNADOES.
..COHEN.. 04/16/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GSP...FFC...
LAT...LON 32008348 32148470 33188498 34138446 34348341 33578269
32348286 32008348SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 9:12 PM EDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Butts and 69 more | 9 hr |
| Apr 15, 11:41 PM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 59 more | 94 min |
| Apr 16, 2:43 AM EDT | Mesoscale Discussion | SPC | Baker, Calhoun, Clay, Decatur, Dougherty, Early and 4 more | 92 min |
| Apr 16, 3:05 AM EDT | Tornado Watch | SPC | Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more | 7 hr |
| Apr 16, 5:09 AM EDT | Mesoscale Discussion | SPC | Clarke, Columbia, Elbert, Franklin, Glascock, Greene and 12 more | 96 min |
| Apr 16, 5:57 AM EDT | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 56 more | 8 hr |
| Apr 16, 7:57 AM EDT | Mesoscale Discussion | SPC | Atkinson, Bacon, Brantley, Camden, Charlton, Clinch and 10 more | 63 min |
| Apr 16, 10:39 AM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 12 more | 2 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.