Alert archive / Georgia / Mesoscale Discussions in 2018
Mesoscale Discussion 1689
The Storm Prediction Center issued this mesoscale discussion at Dec 1, 2018, 9:18 PM CST for 5 counties in Alabama; 11 counties in Florida; 28 counties in Georgia. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Dec 1, 2018, 9:18 PM CST (03:18 UTC)
- Expired
- Dec 1, 2018, 10:45 PM CST
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 44 counties
Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Calhoun County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Atkinson County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks 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, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Wilcox County, GA, Worth County, GA
The radar
The Tallahassee radar (KTLH), 53 km from the middle of the area, began a volume at 03:20 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
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 3.3 hours before the alert went out and 55 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, 11:27 PM CST | Mesoscale Discussion | SPC | Dale, Geneva, Henry, Houston | 93 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 Florida, 2018Mesoscale Discussions in Alabama, 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.