Alert archive / Georgia / Mesoscale Discussions in 2014
Mesoscale Discussion 139
The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2014, 8:17 AM EST for 6 counties in Florida; 39 counties in Georgia; 18 counties in South Carolina. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2014, 8:17 AM EST (13:17 UTC)
- Expired
- Feb 21, 2014, 10:15 AM EST
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 63 counties
Baker County, FL, Columbia County, FL, Hamilton County, FL, Jefferson County, FL, Madison County, FL, Suwannee County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Jenkins County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Calhoun County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC
The radar
The Robins AFB radar (KJGX), 119 km from the middle of the area, began a volume at 13:21 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, 1.3 hours before the alert went out and 183 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
- 968 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 609 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 4.3
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 |
|---|---|---|---|---|
| Feb 21, 12:43 AM EST | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa | 62 min |
| Feb 21, 1:58 AM EST | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more | 7 hr |
| Feb 21, 4:33 AM EST | Mesoscale Discussion | SPC | Holmes, Jackson, Okaloosa, Santa Rosa, Walton | 87 min |
| Feb 21, 6:39 AM EST | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more | 9 hr |
| Feb 21, 10:13 AM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more | 92 min |
| Feb 21, 12:43 PM EST | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Jefferson, Lafayette, Leon and 5 more | 62 min |
| Feb 20, 10:29 PM EST | Mesoscale Discussion | SPC | Bartow, Catoosa, Chattooga, Dade, Dawson, Fannin and 10 more | 61 min |
| Feb 20, 10:47 PM EST | Tornado Watch | SPC | Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 16 more | 6 hr |
| Feb 21, 3:11 AM EST | Mesoscale Discussion | SPC | Anderson, Cherokee, Greenville, Pickens, Spartanburg | 94 min |
| Feb 21, 8:57 AM EST | Mesoscale Discussion | SPC | Dillon, Horry, Marion, Marlboro | 63 min |
| Feb 21, 10:02 AM EST | Tornado Watch | SPC | Darlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more | 6 hr |
| Feb 21, 11:05 AM EST | Mesoscale Discussion | SPC | Dillon, Marion | 55 min |
Nearby
Mesoscale Discussions in Georgia, 2014Mesoscale Discussions in South Carolina, 2014Mesoscale Discussions in Florida, 2014Every mesoscale discussion in 2014
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.