Alert archive / Georgia / Mesoscale Discussions in 2004
Mesoscale Discussion 2174
The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2004, 4:06 AM EDT for 27 counties in Florida; 45 counties in Georgia. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2004, 4:06 AM EDT (08:06 UTC)
- Expired
- Sep 6, 2004, 5:30 AM EDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 72 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Calhoun County, GA, Camden County, GA, Charlton County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Miller County, GA, Mitchell County, GA, Pierce County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Tattnall County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Worth County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 00:00Z, 8.1 hours before the alert went out and 141 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
- 498 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 529 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 060809 SWOMCD SPC MCD 060806 FLZ000-GAZ000-ALZ000-060930- MESOSCALE DISCUSSION 2174 NWS STORM PREDICTION CENTER NORMAN OK 0306 AM CDT MON SEP 06 2004 AREAS AFFECTED...SRN GA/NRN FL CONCERNING...TORNADO WATCH 802... VALID 060806Z - 060930Z GREATEST TORNADO POTENTIAL THROUGH 10 OR 11Z IS EXPECTED TO PERSIST OVER SERN GA...WITH A SLOW EWD SHIFT ACROSS S-CNTRL GA/N-CNTRL FL LATER THIS MORNING. A REPLACEMENT WW WILL LIKELY BE ISSUED WITHIN THE NEXT 1-1.5 HOURS. LATEST CHS REFLECTIVITY/VELOCITY DATA SHOW A RAINBAND WITH SEVERAL EMBEDDED MESOCYCLONES FROM 60S CHS WWD TO 30W OF SAV WITH A GENERAL STORM MOTION OF 115/35. SYNTHESIS OF RUC OBJECTIVE FIELDS WITH CURRENT VWP DATA SUGGEST THAT CORRIDOR FROM THE MOUTH OF THE SAVANNAH RIVER SWD TO THE FL BORDER AND INLAND 80-100NM REMAINS MOST FAVORABLE FOR ISOLATED TORNADOES WITH MLCAPES OF 500 J/KG AND 0-1KM SRH VALUES OF 300-350 M2/S2. EXPECT HIGHEST PROBABILITY OF TORNADOES TO PERSIST ACROSS THIS SAME GENERAL AREA FOR THE NEXT SEVERAL HOURS OWING TO THE SLOW MOVEMENT OF PARENT TROPICAL SYSTEM. THREAT AREA SHOULD TEND TO SHIFT SLOWLY WWD INTO S-CNTRL GA/N-CNTRL FL LATER THIS MORNING. ..MEAD.. 09/06/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CHS...MLB...TBW...JAX...FFC...TAE...BMX... 32008515 31798287 32138221 32098128 31498081 28848082 29368513
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 8:35 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 9 hr |
| Sep 6, 12:12 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 2 hr |
| Sep 6, 4:50 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 11 more | 9 hr |
| Sep 6, 7:48 AM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Hardee, Highlands, Lake and 8 more | 87 min |
| Sep 6, 7:55 AM EDT | Tornado Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 21 more | 6 hr |
| Sep 6, 12:28 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more | 92 min |
| Sep 6, 1:20 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 38 more | 7 hr |
| Sep 6, 3:55 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 10 more | 2 hr |
| Sep 6, 7:12 PM EDT | Mesoscale Discussion | SPC | Baker, Columbia, Duval, Nassau, Union | 2 hr |
| Sep 6, 7:45 PM EDT | Tornado Watch | SPC | Bradford, Clay, Duval, Flagler, Nassau, Putnam and 1 more | 9 hr |
| Sep 6, 1:21 AM EDT | Mesoscale Discussion | SPC | Richmond | 84 min |
| Sep 6, 1:00 PM EDT | Tornado Watch | SPC | Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 49 more | 7 hr |
Nearby
Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in Florida, 2004Every mesoscale discussion in 2004
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.