Alert archive / Mississippi / Mesoscale Discussions in 2018
Mesoscale Discussion 1747
The Storm Prediction Center issued this mesoscale discussion at Dec 31, 2018, 11:22 AM CST for 4 states. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Dec 31, 2018, 11:22 AM CST (17:22 UTC)
- Expired
- Dec 31, 2018, 12:45 PM CST
- In force
- 83 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 78 counties
Colbert County, AL, Franklin County, AL, Lamar County, AL, Lauderdale County, AL, Marion County, AL, Calloway County, KY, Christian County, KY, Graves County, KY, Marshall County, KY, Todd County, KY, Trigg County, KY, Alcorn County, MS, Attala County, MS, Benton County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Copiah County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Itawamba County, MS, Jasper County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Madison County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Stewart County, TN, Wayne County, TN, Weakley County, TN
The radar
The Columbus AFB radar (KGWX), 64 km from the middle of the area, began a volume at 17:20 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, 5.4 hours before the alert went out and 117 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
- 414 m above ground
- 0-6 km bulk shear
- 88 kt
- 0-1 km storm-relative helicity
- 294 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Dec 31, 11:47 AM CST | Tornado Watch | SPC | Colbert, Cullman, Fayette, Franklin, Greene, Lamar and 11 more | 5 hr |
| Dec 31, 1:54 PM CST | Mesoscale Discussion | SPC | Colbert, Fayette, Franklin, Greene, Lamar, Lauderdale and 10 more | 2 hr |
| Dec 31, 12:48 PM CST | Severe Thunderstorm Watch | SPC | Allen, Anderson, Barren, Breckinridge, Bullitt, Butler and 35 more | 3 hr |
| Dec 31, 2:16 PM CST | Mesoscale Discussion | SPC | Allen, Barren, Breckinridge, Bullitt, Butler, Edmonson and 12 more | 119 min |
| Dec 31, 7:02 AM CST | Mesoscale Discussion | SPC | Adams, Amite, Attala, Choctaw, Claiborne, Copiah and 26 more | 118 min |
Nearby
Mesoscale Discussions in Mississippi, 2018Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in Kentucky, 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.