Alert archive / Georgia / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 66
The Storm Prediction Center issued this severe thunderstorm watch at Mar 26, 2011, 9:19 PM EDT for 45 counties in Georgia; 10 counties in South Carolina. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 26, 2011, 9:19 PM EDT (01:19 UTC)
- Expired
- Mar 27, 2011, 5:00 AM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 55 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Burke County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Columbia County, GA, Dade County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Greene County, GA, Gwinnett County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lincoln County, GA, Lumpkin County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Murray County, GA, Oconee County, GA, Oglethorpe County, GA, Pickens County, GA, Rabun County, GA, Richmond County, GA, Stephens County, GA, Taliaferro County, GA, Towns County, GA, Union County, GA, Walker County, GA, Walton County, GA, Warren County, GA, White County, GA, Whitfield County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Anderson County, SC, Barnwell County, SC, Edgefield County, SC, Greenwood County, SC, McCormick County, SC, Oconee County, SC, Pickens County, SC, Saluda County, SC
The radar
The Atlanta radar (KFFC), 135 km from the middle of the area, began a volume at 01:21 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 5%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 9:28 PM EDT | Severe Thunderstorm Warning | FFC | Cherokee, Gilmer, Pickens | 47 min |
| Mar 26, 9:37 PM EDT | Severe Thunderstorm Warning | FFC | Bartow, Chattooga, Floyd | 38 min |
| Mar 26, 9:44 PM EDT | Severe Thunderstorm Warning | FFC | Hall, White | 46 min |
| Mar 26, 10:08 PM EDT | Severe Thunderstorm Warning | FFC | Bartow, Cherokee, Cobb, Paulding, Polk | 52 min |
| Mar 26, 10:18 PM EDT | Severe Thunderstorm Warning | GSP | Habersham | 11 min |
| Mar 26, 10:22 PM EDT | Severe Thunderstorm Warning | FFC | Forsyth, Hall, Jackson | 38 min |
| Mar 26, 10:30 PM EDT | Severe Thunderstorm Warning | FFC | Cobb, DeKalb, Fulton, Gwinnett | 60 min |
| Mar 26, 11:13 PM EDT | Severe Thunderstorm Warning | FFC | Barrow, DeKalb, Henry, Newton, Oconee, Rockdale and 1 more | 47 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.3 hours before the alert went out and 130 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
- 120 J/kg
- Mixed-layer CIN
- -166 J/kg
- Mixed-layer LCL
- 635 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 343 m²/s²
- 0-3 km storm-relative helicity
- 404 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 26, 8:47 PM EDT | Tornado Watch | SPC | Baldwin, Ben Hill, Bibb, Bleckley, Butts, Carroll and 61 more | 7 hr |
| Mar 26, 8:55 PM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more | 95 min |
| Mar 26, 11:10 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 3 more | 65 min |
| Mar 27, 12:21 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Butts, Carroll, Chattahoochee and 55 more | 54 min |
| Mar 27, 12:43 AM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 38 more | 62 min |
| Mar 27, 3:03 AM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Ben Hill, Bibb, Bleckley and 40 more | 57 min |
| Mar 27, 3:25 AM EDT | Tornado Watch | SPC | Appling, Baldwin, Bibb, Bleckley, Bryan, Bulloch and 46 more | 3 hr |
| Mar 27, 8:33 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Butts and 48 more | 117 min |
| Mar 27, 9:55 AM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 87 more | 7 hr |
| Mar 27, 11:51 AM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 64 more | 84 min |
| Mar 27, 3:49 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 44 more | 56 min |
| Mar 27, 4:27 PM EDT | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 38 more | 5 hr |
| Mar 27, 7:24 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 34 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Georgia, 2011Severe Thunderstorm Watches in South Carolina, 2011Every severe thunderstorm watch 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.