Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 345
The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2012, 12:29 PM EDT for 10 counties in Florida; 25 counties in Georgia; 4 counties in South Carolina. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2012, 12:29 PM EDT (16:29 UTC)
- Expired
- Mar 24, 2012, 1:30 PM EDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 39 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Nassau 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, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Toombs County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Colleton County, SC, Hampton County, SC, Jasper County, SC
The radar
The Jacksonville radar (KJAX), 111 km from the middle of the area, began a volume at 16:30 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
Jacksonville, FL (KJAX), launched 12:00Z, 4.5 hours before the alert went out and 109 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
- 139 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 982 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
823
ACUS11 KWNS 241629
SWOMCD
SPC MCD 241629
SCZ000-GAZ000-FLZ000-241730-
MESOSCALE DISCUSSION 0345
NWS STORM PREDICTION CENTER NORMAN OK
1129 AM CDT SAT MAR 24 2012
AREAS AFFECTED...SERN GA...NERN FL...SRN SC
CONCERNING...SEVERE THUNDERSTORM WATCH 104...
VALID 241629Z - 241730Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 104
CONTINUES.
AN ISOLATED DAMAGING WIND THREAT MAY EXTEND N OF WW 104 INTO SRN
SC...BUT MAY REMAIN MARGINAL IN INTENSITY AND SPATIALLY TO NOT A
WARRANT A NEW WW ISSUANCE.
SEVERAL CLUSTERS AND SHORT-LINE SEGMENTS EXIST ACROSS MUCH OF THE
WRN PORTION OF WW 104 AS OF 1615Z...ALONG/AHEAD OF A FRACTURED
PORTION OF THE SYNOPTIC COLD FRONT. ALTHOUGH ACTIVITY HAS LARGELY
REMAINED STRONG TO MARGINALLY SEVERE...SOME RISK FOR PRIMARILY
ISOLATED DAMAGING WINDS SHOULD DEVELOP INTO PARTS OF FAR SRN SC.
FARTHER S...THE KVAX VWP STILL INDICATES SFC-6 KM SHEAR AROUND 35 KT
WHICH WILL SUPPORT ORGANIZED UPDRAFTS UNTIL CONVECTION CLEARS THE
COAST BY LATE AFTERNOON.
..GRAMS.. 03/24/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CHS...TBW...JAX...FFC...TAE...
LAT...LON 31998268 32598180 32888112 32948054 32818012 32648007
32138067 31338125 30258154 29518209 29538267 29728294
30548297 31348302 31998268SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 10:16 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 8 more | 59 min |
| Mar 24, 10:45 AM EDT | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more | 8 hr |
| Mar 24, 4:19 PM EDT | Mesoscale Discussion | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more | 86 min |
| Mar 24, 6:25 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 11 more | 65 min |
| Mar 24, 4:16 PM EDT | Mesoscale Discussion | SPC | Richmond | 59 min |
| Mar 24, 5:52 PM EDT | Mesoscale Discussion | SPC | Chattooga, Dade, Walker | 53 min |
| Mar 24, 12:03 PM EDT | Mesoscale Discussion | SPC | Cherokee, Chester, Chesterfield, Edgefield, Fairfield, Greenwood and 9 more | 117 min |
| Mar 24, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 32 more | 7 hr |
| Mar 24, 7:21 PM EDT | Mesoscale Discussion | SPC | Aiken, Bamberg, Barnwell, Berkeley, Calhoun, Charleston and 17 more | 84 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Florida, 2012Mesoscale Discussions in South Carolina, 2012Every mesoscale discussion in 2012
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.