Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 984
The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 2:32 PM CDT for 5 states. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2011, 2:32 PM CDT (19:32 UTC)
- Expired
- May 26, 2011, 3:30 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 48 counties
Cherokee County, AL, Bartow County, GA, Cherokee County, GA, Cobb County, GA, Dawson County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hall County, GA, Haralson County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, White County, GA, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Oconee County, SC, Pickens County, SC, Carter County, TN, Cocke County, TN, Greene County, TN, Hamblen County, TN, Jefferson County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN
The radar
The Knoxville radar (KMRX), 119 km from the middle of the area, began a volume at 19:34 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, 7.5 hours before the alert went out and 210 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
- 516 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 708 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.1
The text
As transmitted, in the capitals the NWS used until 2016.
795
ACUS11 KWNS 261933
SWOMCD
SPC MCD 261932
TNZ000-NCZ000-SCZ000-GAZ000-ALZ000-262030-
MESOSCALE DISCUSSION 0984
NWS STORM PREDICTION CENTER NORMAN OK
0232 PM CDT THU MAY 26 2011
AREAS AFFECTED...NRN GA...ERN TN...WRN NC/SC
CONCERNING...SEVERE THUNDERSTORM WATCH 379...
VALID 261932Z - 262030Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 379
CONTINUES.
THREAT FOR SUPERCELLS WILL INCREASE DOWNSTREAM OF INITIAL WW 379
ACROSS PORTIONS OF WRN NC/SC AND NERN GA. EXTENSION OF THE WW HAS
BEEN COORDINATED WITH WFO GSP.
AS OF 1930Z...THE MOST INTENSE TSTMS WITHIN WW 379 WERE LOCATED FROM
SEVIER COUNTY TN TO GILMAN COUNTY GA...WHERE REPORTS OF
BASEBALL-SIZED HAIL OCCURRED EARLIER WITH A SUPERCELL TRACKING
ACROSS GILMAN COUNTY. 0-6 KM SHEAR AOA 40 KT SHOULD REMAIN CONFINED
N OF THE ATLANTA LATITUDE...REMAINING FAVORABLE FOR SUPERCELL
STRUCTURES. DOWNSTREAM DEW POINTS HAD INITIALLY MIXED INTO THE
MIDDLE 40S AND 50S...BUT APPEAR TO BE RECOVERING WITH MODEST SLY
LOW-LEVEL FLOW. THIS SHOULD SUPPORT AT LEAST AN ISOLATED THREAT FOR
SEVERE HAIL AND DAMAGING WINDS TO GRADUALLY EVOLVE EWD THROUGH 22Z.
..GRAMS.. 05/26/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GSP...MRX...FFC...BMX...
LAT...LON 33938585 35658389 36318322 36568262 36538207 36228190
35718201 34818262 34318360 33828459 33568516 33938585SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 8:33 PM CDT | Tornado Watch | SPC | Bibb, Colbert, Cullman, Fayette, Franklin, Jefferson and 12 more | 7 hr |
| May 25, 10:27 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lawrence, Marion and 2 more | 2 hr |
| May 26, 7:56 AM CDT | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 22 more | 94 min |
| May 26, 9:15 AM CDT | Severe Thunderstorm Watch | SPC | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 38 more | 9 hr |
| May 26, 10:39 AM CDT | Mesoscale Discussion | SPC | Baldwin, Coffee, Conecuh, Covington, Dale, Escambia and 3 more | 96 min |
| May 26, 12:22 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 33 more | 83 min |
| May 26, 2:44 PM CDT | Severe Thunderstorm Watch | SPC | Henry | 6 hr |
| May 26, 3:36 PM CDT | Mesoscale Discussion | SPC | Calhoun, Chambers, Cherokee, Clay, Cleburne, Etowah and 6 more | 84 min |
| May 26, 4:10 PM CDT | Severe Thunderstorm Watch | SPC | Elbert, Franklin, Habersham, Hart, Rabun, Stephens | 7 hr |
| May 26, 6:12 PM CDT | Mesoscale Discussion | SPC | Columbia, Lincoln, McDuffie | 93 min |
| May 26, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Surry, Watauga, Wilkes, Yadkin | 11 hr |
| May 25, 7:22 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Chester, Crockett, Decatur, Dyer and 18 more | 53 min |
| May 26, 2:09 PM CDT | Mesoscale Discussion | SPC | Clay, Fentress, Jackson, Overton, Pickett, Scott and 1 more | 96 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Tennessee, 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.