Alert archive / South Carolina / Mesoscale Discussions in 2012
Mesoscale Discussion 604
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2012, 11:34 AM EDT for 18 counties in Georgia; 21 counties in South Carolina. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2012, 11:34 AM EDT (15:34 UTC)
- Expired
- Apr 27, 2012, 12:30 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 39 counties
Barrow County, GA, Clarke County, GA, Columbia County, GA, Elbert County, GA, Glascock County, GA, Greene County, GA, Jackson County, GA, Lincoln County, GA, Madison County, GA, McDuffie County, GA, Morgan County, GA, Oconee County, GA, Oglethorpe County, GA, Richmond County, GA, Taliaferro County, GA, Walton County, GA, Warren County, GA, Wilkes County, GA, Abbeville County, SC, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Edgefield County, SC, Georgetown County, SC, Greenwood County, SC, Lexington County, SC, McCormick County, SC, Orangeburg County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Columbia radar (KCAE), 67 km from the middle of the area, began a volume at 15:38 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
Charleston AFB, SC (KCHS), launched 12:00Z, 3.6 hours before the alert went out and 174 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
- 75 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1255 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
750
ACUS11 KWNS 271535
SWOMCD
SPC MCD 271534
SCZ000-GAZ000-271630-
MESOSCALE DISCUSSION 0604
NWS STORM PREDICTION CENTER NORMAN OK
1034 AM CDT FRI APR 27 2012
AREAS AFFECTED...CNTRL/SRN SC...NERN GA
CONCERNING...OUTLOOK UPGRADE
VALID 271534Z - 271630Z
THERE WILL BE A CATEGORICAL UPGRADE TO SLIGHT RISK IN THE UPCOMING
1630Z DAY 1 CONVECTIVE OUTLOOK. CONFIDENCE HAS INCREASED REGARDING A
GREATER THREAT FOR TSTMS FORMING THIS AFTERNOON WITHIN A
QUASI-STATIONARY FRONTAL ZONE...POTENTIALLY PRODUCING SEVERE HAIL
AND DAMAGING WINDS.
..GRAMS.. 04/27/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ILM...CHS...CAE...GSP...FFC...
LAT...LON 32598002 33328307 33808404 34248397 34338376 34358237
33837875 33137923 32598002SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 2:42 PM EDT | Mesoscale Discussion | SPC | Columbia, Elbert, Hart, Lincoln, Richmond, Wilkes | 2 hr |
| Apr 27, 5:36 PM EDT | Severe Thunderstorm Watch | SPC | Columbia, Elbert, Franklin, Hart, Lincoln, McDuffie and 2 more | 6 hr |
Nearby
Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in Georgia, 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.