Alert archive / Mississippi / Mesoscale Discussions in 2018
Mesoscale Discussion 820
The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2018, 9:09 AM CDT for 8 counties in Alabama; 21 counties in Mississippi. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2018, 9:09 AM CDT (14:09 UTC)
- Expired
- Jun 22, 2018, 10:45 AM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 29 counties
Fayette County, AL, Franklin County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Tallahatchie County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS
The radar
The Columbus AFB radar (KGWX), 34 km from the middle of the area, began a volume at 14:08 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
Little Rock, AR (KBYH), launched 12:00Z, 2.2 hours before the alert went out and 167 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1698 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 8:30 PM CDT | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone | 2 hr |
| Jun 22, 12:35 PM CDT | Mesoscale Discussion | SPC | Blount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 15 more | 85 min |
| Jun 22, 8:42 AM CDT | Mesoscale Discussion | SPC | Claiborne, Hinds, Issaquena, Jefferson, Sharkey, Warren and 1 more | 93 min |
| Jun 22, 10:55 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Claiborne, Clarke, Copiah, Covington, Forrest and 19 more | 10 hr |
| Jun 22, 3:03 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Copiah, Covington, Franklin and 15 more | 87 min |
| Jun 22, 6:05 PM CDT | Mesoscale Discussion | SPC | Claiborne, Clarke, Copiah, Covington, Hinds, Issaquena and 14 more | 115 min |
Nearby
Mesoscale Discussions in Mississippi, 2018Mesoscale Discussions in Alabama, 2018Every mesoscale discussion in 2018
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.