Alert archive / Mississippi / Mesoscale Discussions in 2013
Mesoscale Discussion 528
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2013, 8:46 PM CDT for 12 counties in Alabama; 22 counties in Mississippi; 5 counties in Tennessee. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2013, 8:46 PM CDT (01:46 UTC)
- Expired
- Apr 18, 2013, 9:45 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 39 counties
Colbert County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Marion County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Alcorn County, MS, Attala County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Kemper County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Winston County, MS, Giles County, TN, Hardin County, TN, Lawrence County, TN, McNairy County, TN, Wayne County, TN
The radar
The Columbus AFB radar (KGWX), 18 km from the middle of the area, began a volume at 01:46 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
Birmingham, AL (KBMX), launched 00:00Z, 1.8 hours before the alert went out and 169 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
- 22 J/kg
- Mixed-layer CIN
- -267 J/kg
- Mixed-layer LCL
- 1515 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 230 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 |
|---|---|---|---|---|
| Apr 19, 1:52 AM CDT | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Clay, Cleburne, DeKalb and 8 more | 83 min |
| Apr 19, 10:42 AM CDT | Mesoscale Discussion | SPC | Henry, Houston | 3 hr |
| Apr 18, 8:57 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Decatur, Dickson, Henderson, Henry and 7 more | 63 min |
Nearby
Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Tennessee, 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.