Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 2219
The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2012, 4:34 PM CST for 15 counties in Alabama. It was in force for 26 min.
The area
The outline as issued.
The facts
- Issued
- Dec 25, 2012, 4:34 PM CST (22:34 UTC)
- Expired
- Dec 25, 2012, 5:00 PM CST
- In force
- 26 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
Counties Bibb County, AL, Calhoun County, AL, Chambers County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Fayette County, AL, Jefferson County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL
The radar
The Birmingham radar (KBMX), 39 km from the middle of the area, began a volume at 22:36 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, 10.6 hours before the alert went out and 38 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
- 1008 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Dec 25, 12:58 PM CST | Tornado Watch | SPC | Autauga, Baldwin, Barbour, Bullock, Chambers, Choctaw and 19 more | 9 hr |
| Dec 25, 2:32 PM CST | Mesoscale Discussion | SPC | Butler, Coffee, Conecuh, Covington, Crenshaw, Dale and 5 more | 28 min |
| Dec 25, 2:41 PM CST | Tornado Watch | SPC | Butler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more | 7 hr |
| Dec 25, 3:44 PM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Butler, Choctaw, Clarke, Crenshaw and 13 more | 91 min |
| Dec 25, 4:38 PM CST | Severe Thunderstorm Watch | SPC | Bibb, Blount, Calhoun, Chilton, Clay, Cleburne and 11 more | 5 hr |
| Dec 25, 5:17 PM CST | Mesoscale Discussion | SPC | Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 17 more | 88 min |
Nearby
Mesoscale Discussions in Alabama, 2012Every mesoscale discussion in 2012
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.