Alert archive / Alabama / Mesoscale Discussions in 2017
Mesoscale Discussion 1787
The Storm Prediction Center issued this mesoscale discussion at Dec 8, 2017, 7:55 AM CST for 25 counties in Alabama; 22 counties in Georgia; 4 counties in Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 8, 2017, 7:55 AM CST (13:55 UTC)
- Expired
- Dec 8, 2017, 11:00 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 51 counties
Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marshall County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Banks County, GA, Bartow County, GA, Carroll County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dawson County, GA, Douglas County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Hall County, GA, Haralson County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Kemper County, MS, Lauderdale County, MS, Lowndes County, MS, Noxubee County, MS
The radar
The Birmingham radar (KBMX), 59 km from the middle of the area, began a volume at 13:55 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 1.9 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 735 m above ground
- 0-6 km bulk shear
- 76 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 423 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 8, 11:06 AM CST | Mesoscale Discussion | SPC | Rabun, Towns, Union | 4 hr |
| Dec 8, 5:32 PM CST | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Carroll, Cherokee, Clarke and 24 more | 3 hr |
| Dec 8, 3:36 AM CST | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Copiah, Covington, Franklin and 18 more | 4 hr |
Nearby
Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in Mississippi, 2017Every mesoscale discussion in 2017
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.