Alert archive / Alabama / Mesoscale Discussions in 2009
Mesoscale Discussion 19
The Storm Prediction Center issued this mesoscale discussion at Jan 6, 2009, 3:57 PM CST for 18 counties in Alabama; 4 counties in Georgia; 6 counties in Mississippi. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Jan 6, 2009, 3:57 PM CST (21:57 UTC)
- Expired
- Jan 6, 2009, 5:30 PM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 28 counties
Autauga County, AL, Bibb County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Etowah County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Washington County, AL, Chattooga County, GA, Floyd County, GA, Haralson County, GA, Polk County, GA, Forrest County, MS, Greene County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS
The radar
The Birmingham radar (KBMX), 113 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 113 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
- 163 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 560 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- 240 m²/s²
- 0-3 km storm-relative helicity
- 258 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 0.9
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 |
|---|---|---|---|---|
| Jan 6, 9:43 AM CST | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 8 more | 2 hr |
| Jan 6, 2:03 PM CST | Tornado Watch | SPC | Baldwin, Bibb, Blount, Calhoun, Cherokee, Chilton and 24 more | 5 hr |
| Jan 6, 4:37 PM CST | Tornado Watch | SPC | Banks, Barrow, Bartow, Carroll, Cherokee, Clarke and 39 more | 3 hr |
Nearby
Mesoscale Discussions in Alabama, 2009Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Georgia, 2009Every mesoscale discussion in 2009
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.