Alert archive / Georgia / Mesoscale Discussions in 2018
Mesoscale Discussion 1690
The Storm Prediction Center issued this mesoscale discussion at Dec 1, 2018, 11:27 PM CST for 4 counties in Alabama; Holmes County, Florida; 25 counties in Georgia. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Dec 1, 2018, 11:27 PM CST (05:27 UTC)
- Expired
- Dec 2, 2018, 1:00 AM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 30 counties
Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Holmes County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Irwin County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Sumter County, GA, Terrell County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA
The radar
The Ft Rucker radar (KEOX), 69 km from the middle of the area, began a volume at 05:31 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
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 5.5 hours before the alert went out and 124 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
- 262 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 394 m²/s²
- 0-3 km storm-relative helicity
- 472 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.5
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 1, 9:18 PM CST | Mesoscale Discussion | SPC | Coffee, Dale, Geneva, Henry, Houston | 87 min |
| Dec 2, 2:03 AM CST | Mesoscale Discussion | SPC | Geneva, Henry, Houston | 2 hr |
| Dec 2, 2:48 AM CST | Tornado Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 7 hr |
| Dec 2, 6:00 AM CST | Mesoscale Discussion | SPC | Jackson | 2 hr |
| Dec 2, 11:32 AM CST | Mesoscale Discussion | SPC | Leon | 88 min |
| Dec 2, 9:00 AM CST | Tornado Watch | SPC | Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 38 more | 8 hr |
Nearby
Mesoscale Discussions in Georgia, 2018Mesoscale Discussions in Alabama, 2018Mesoscale Discussions in Florida, 2018Every mesoscale discussion in 2018
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.