Alert archive / Mississippi / Mesoscale Discussions in 2012
Mesoscale Discussion 1756
The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2012, 5:14 PM CDT for 26 counties in Mississippi; Fayette County, Tennessee. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2012, 5:14 PM CDT (22:14 UTC)
- Expired
- Aug 13, 2012, 6:45 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 27 counties
Alcorn County, MS, Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tallahatchie County, MS, Tippah County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Fayette County, TN
The radar
The Columbus AFB radar (KGWX), 96 km from the middle of the area, began a volume at 22:18 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
Little Rock, AR (KBYH), launched 12:00Z, 10.2 hours before the alert went out and 99 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
- 1586 J/kg
- Mixed-layer CIN
- -113 J/kg
- Mixed-layer LCL
- 909 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.0
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 |
|---|---|---|---|---|
| Aug 13, 7:48 AM CDT | Mesoscale Discussion | SPC | Attala, Bolivar, Calhoun, Carroll, Choctaw, Clay and 20 more | 87 min |
| Aug 13, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | Wayne | 4 hr |
| Aug 13, 3:15 PM CDT | Mesoscale Discussion | SPC | Benton, Bolivar, Carroll, Coahoma, DeSoto, Grenada and 12 more | 30 min |
| Aug 13, 3:32 PM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 26 more | 7 hr |
| Aug 13, 12:21 PM CDT | Mesoscale Discussion | SPC | Franklin, Grundy, Lincoln, Moore | 24 min |
| Aug 13, 3:49 PM CDT | Mesoscale Discussion | SPC | Bledsoe, Bradley, Hamilton, Marion, Meigs, Rhea and 1 more | 56 min |
Nearby
Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Tennessee, 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.