Alert archive / Alabama / Mesoscale Discussions in 2013
Mesoscale Discussion 565
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2013, 4:54 PM CDT for 18 counties in Alabama; Floyd County, Polk County, Georgia; 5 counties in Mississippi. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2013, 4:54 PM CDT (21:54 UTC)
- Expired
- Apr 27, 2013, 6:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 25 counties
Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL, Floyd County, GA, Polk County, GA, Itawamba County, MS, Lee County, MS, Monroe County, MS, Prentiss County, MS, Tishomingo County, MS
The radar
The Birmingham radar (KBMX), 105 km from the middle of the area, began a volume at 21:56 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
Birmingham, AL (KBMX), launched 12:00Z, 9.9 hours before the alert went out and 104 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
- 1729 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 27, 1:55 PM CDT | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Lamar, Lauderdale, Marion and 1 more | 2 hr |
| Apr 27, 5:24 PM CDT | Severe Thunderstorm Watch | SPC | Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 20 more | 4 hr |
| Apr 27, 3:47 PM CDT | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 10 hr |
Nearby
Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Georgia, 2013Every mesoscale discussion in 2013
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.