Alert archive / Georgia / Mesoscale Discussions in 2011
Mesoscale Discussion 507
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2011, 5:40 PM EDT for Duval County, Nassau County, Florida; 28 counties in Georgia; 11 counties in South Carolina. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2011, 5:40 PM EDT (21:40 UTC)
- Expired
- Apr 21, 2011, 8:15 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Duval County, FL, Nassau County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Jasper County, SC
The radar
The Charleston,SC radar (KCLX), 72 km from the middle of the area, began a volume at 21:41 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, 9.7 hours before the alert went out and 140 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
- 1320 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1241 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 2:05 AM EDT | Mesoscale Discussion | SPC | Baldwin, Barrow, Bartow, Bibb, Butts, Carroll and 39 more | 85 min |
| Apr 21, 2:32 AM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Banks, Barrow, Bartow, Butts, Carroll and 51 more | 2 hr |
| Apr 21, 4:09 AM EDT | Mesoscale Discussion | SPC | Clarke, Elbert, Franklin, Greene, Hart, Lincoln and 5 more | 96 min |
Nearby
Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in South Carolina, 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; radar from the NEXRAD Level II archive.