Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 663
The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2011, 12:19 PM EDT for 15 counties in Florida; 16 counties in Georgia. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 28, 2011, 12:19 PM EDT (16:19 UTC)
- Expired
- Apr 28, 2011, 1:15 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 31 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 4.3 hours before the alert went out and 94 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
- 1394 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 817 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
324 ACUS11 KWNS 281619 SWOMCD SPC MCD 281619 GAZ000-FLZ000-281715- MESOSCALE DISCUSSION 0663 NWS STORM PREDICTION CENTER NORMAN OK 1119 AM CDT THU APR 28 2011 AREAS AFFECTED...NRN FL...SERN GA CONCERNING...SEVERE THUNDERSTORM WATCH 254... VALID 281619Z - 281715Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 254 CONTINUES. WEAK WARM ADVECTION IN THE WAKE OF LEADING LINE OF TSTMS WILL CONTRIBUTE TO ADDITIONAL ELEVATED CONVECTION ACROSS MUCH OF SERN GA INTO THE MID AFTERNOON HOURS. GRADUALLY VEERING/DEEPENING FLOW ACROSS NRN FL WILL PROVIDE THE MOMENTUM NECESSARY FOR ONGOING FRONTAL BAND OF STORMS TO PROGRESS ACROSS THE REMAINDER OF THE WW...THOUGH ISOLATED TSTMS MAY YET EVOLVE AHEAD OF THIS ACTIVITY WITHIN EXPANDING CU FIELD OVER THE WARM SECTOR. ..DARROW.. 04/28/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CHS...TBW...JAX...TAE... LAT...LON 29418457 31868237 31887980 29428207 29418457
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 2:22 AM EDT | Mesoscale Discussion | SPC | Holmes | 83 min |
| Apr 28, 9:47 AM EDT | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 13 more | 9 hr |
| Apr 28, 3:34 PM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 25 more | 56 min |
| Apr 27, 8:55 PM EDT | Mesoscale Discussion | SPC | Chattooga, Walker | 65 min |
| Apr 28, 12:09 AM EDT | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Bibb, Butts, Carroll and 65 more | 36 min |
| Apr 28, 12:56 AM EDT | Tornado Watch | SPC | Baldwin, Banks, Barrow, Bibb, Bleckley, Burke and 80 more | 4 hr |
| Apr 28, 3:30 AM EDT | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Burke, Chattahoochee, Columbia and 30 more | 90 min |
| Apr 28, 4:30 AM EDT | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Bulloch, Burke, Candler and 37 more | 10 hr |
| Apr 28, 8:05 AM EDT | Mesoscale Discussion | SPC | Burke, Candler, Dodge, Emanuel, Jefferson, Jenkins and 5 more | 85 min |
| Apr 28, 8:48 AM EDT | Tornado Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 7 hr |
| Apr 28, 11:22 AM EDT | Mesoscale Discussion | SPC | Bulloch, Burke, Candler, Chatham, Effingham, Emanuel and 2 more | 53 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Florida, 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.