Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 291
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2011, 3:03 AM EDT for 46 counties in Georgia. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2011, 3:03 AM EDT (07:03 UTC)
- Expired
- Mar 27, 2011, 4:00 AM EDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 46 counties
Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Bibb County, GA, Bleckley County, GA, Brantley County, GA, Candler County, GA, Chattahoochee County, GA, Coffee County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Evans County, GA, Harris County, GA, Houston County, GA, Irwin County, GA, Jeff Davis County, GA, Johnson County, GA, Laurens County, GA, Lee County, GA, Long County, GA, Macon County, GA, Marion County, GA, Montgomery County, GA, Muscogee County, GA, Peach County, GA, Pierce County, GA, Pulaski County, GA, Schley County, GA, Sumter County, GA, Talbot County, GA, Tattnall County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Wayne County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA
The radar
The Robins AFB radar (KJGX), 57 km from the middle of the area, began a volume at 07:04 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, 7.1 hours before the alert went out and 175 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
The text
As transmitted, in the capitals the NWS used until 2016.
278
ACUS11 KWNS 270703
SWOMCD
SPC MCD 270703
GAZ000-270800-
MESOSCALE DISCUSSION 0291
NWS STORM PREDICTION CENTER NORMAN OK
0203 AM CDT SUN MAR 27 2011
AREAS AFFECTED...WRN/CNTRL GA
CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY
VALID 270703Z - 270800Z
STORMS ARE EXPECTED TO PERSIST ACROSS CNTRL GA OVER THE NEXT FEW
HOURS...WITHIN A MARGINALLY FAVORABLE ENVIRONMENT FOR AN ISOLATED
TORNADO. A NEW WW MAY BE REQUIRED MAINLY FOR CNTRL/SRN GA.
AN E-W ORIENTED BAND OF STORMS...NEARLY PARALLEL TO THE DEEP LAYER
SHEAR VECTOR...CONTINUES TO DRIFT SLOWLY SEWD. COMPOSITE RADAR
IMAGERY SHOWS A WELL DEFINED OUTFLOW BOUNDARY AHEAD OF THE ERN GA/SC
ACTIVITY...CURLING BACK NWWD INTO CNTRL/WRN GA WHERE STORMS ARE
LIKELY MORE SURFACE BASED.
STRONG DEEP LAYER SHEAR/LONG HODOGRAPHS REMAIN IN PLACE ACROSS THE
REGION...AND SEWD STORM MOTIONS ARE CREATING ENOUGH STORM RELATIVE
HELICITY FOR ROTATION WITHIN SOME CELLS. ONE OF THE BEST DEVELOPED
MESOCYCLONES AS INDICATED BY RADAR WAS RECENTLY NOTED OVER TROUP
COUNTY GA...WHICH WILL BE MOVING INTO MERIWETHER COUNTY AND PERHAPS
NRN TALBOT/UPSON COUNTIES. GIVEN SUCH STRONG SHEAR AND SURFACE BASED
INSTABILITY...A BRIEF TORNADO MAY OCCUR AND A WATCH WILL BE ISSUED
SOON.
..JEWELL.. 03/27/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CHS...JAX...FFC...TAE...
LAT...LON 32668503 33058492 32988420 32888332 32748267 32328176
31938153 31478149 31158190 31078226 31398318 31888431
32098469 32668503SPC 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, 9:19 PM EDT | Severe Thunderstorm Watch | SPC | Banks, Barrow, Bartow, Burke, Catoosa, Chattooga and 39 more | 8 hr |
| 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, 3:25 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
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.