Alert archive / Georgia / Mesoscale Discussions in 2008
Mesoscale Discussion 2321
The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2008, 1:45 PM EDT for 15 counties in Florida; 26 counties in Georgia; 8 counties in South Carolina. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2008, 1:45 PM EDT (17:45 UTC)
- Expired
- Oct 9, 2008, 2:45 PM EDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 49 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA, Allendale County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC
The radar
The Jacksonville radar (KJAX), 53 km from the middle of the area, began a volume at 17:48 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 nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 5.8 hours before the alert went out and 51 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
- 223 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 933 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 091745 SWOMCD SPC MCD 091745 SCZ000-FLZ000-GAZ000-091845- MESOSCALE DISCUSSION 2321 NWS STORM PREDICTION CENTER NORMAN OK 1245 PM CDT THU OCT 09 2008 AREAS AFFECTED...NRN FL...SERN GA...COASTAL SC CONCERNING...SEVERE THUNDERSTORM WATCH 914... VALID 091745Z - 091845Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 914 CONTINUES. DEEP CONVECTION CONTINUES TO MODULATE AHEAD OF PRIMARY LEAD SFC CONFLUENCE ZONE FROM THE NERN GULF OF MEXICO...NEWD INTO SWRN SC. AT TIMES EMBEDDED UPDRAFTS HAVE DISPLAYED SOME ROTATION...HOWEVER MULTIPLE STORM MERGERS AND CONVECTIVE OUTFLOW HAS NOW RESULTED IN ROUGHLY 3-4 PRIMARY CONVECTIVE CLUSTERS. OTHER STORMS ARE NOW DEVELOPING/INTENSIFYING BENEATH THE UPPER LOW OVER SWRN GA WHERE BOUNDARY LAYER HAS WARMED BENEATH COOL MID LEVEL TEMPERATURES. LARGE HAIL IS THE MOST LIKELY SEVERE THREAT WITH ACTIVITY BENEATH THE UPPER LOW...WHILE HAIL/WIND MAY ACCOMPANY CONVECTION DOWNSTREAM. ..DARROW.. 10/09/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILM...CHS...CAE...MLB...TBW...JAX...FFC...TAE... 31808295 31948232 32318222 32548207 32898211 32908177 33168147 33038108 33538002 32947895 32577948 31988036 31378088 30728110 29498076 29498112 29278115 29268139 29378141 29318165 28958164 29008254 29218251 29238235 29478241 29608293 29958295 30138320 30418317 30658322 30668311 30888299 31168299 31468315
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 9:51 PM EDT | Mesoscale Discussion | SPC | Columbia, Dixie, Gilchrist, Hamilton, Lafayette, Suwannee and 1 more | 84 min |
| Oct 9, 8:52 AM EDT | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Madison, Nassau, Suwannee and 1 more | 83 min |
| Oct 9, 10:57 AM EDT | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 9 more | 7 hr |
| Oct 9, 3:49 PM EDT | Mesoscale Discussion | SPC | Brevard, Citrus, Hernando, Lake, Orange, Pasco and 3 more | 56 min |
Nearby
Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Florida, 2008Mesoscale Discussions in South Carolina, 2008Every mesoscale discussion in 2008
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.