Alert archive / Mississippi / Mesoscale Discussions in 2018
Mesoscale Discussion 1102
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2018, 1:23 PM CDT for 26 counties in Mississippi. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2018, 1:23 PM CDT (18:23 UTC)
- Expired
- Jul 20, 2018, 3:00 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 26 counties
Attala County, MS, Carroll County, MS, Choctaw County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Jasper County, MS, Jones County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Washington County, MS, Winston County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 45 km from the middle of the area, began a volume at 18:26 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
Jackson, MS (KJAN), launched 12:00Z, 6.4 hours before the alert went out and 44 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
- 1428 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 986 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
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 |
|---|---|---|---|---|
| Jul 19, 8:02 PM CDT | Mesoscale Discussion | SPC | Coahoma, Tunica | 118 min |
| Jul 19, 8:54 PM CDT | Severe Thunderstorm Watch | SPC | Coahoma, DeSoto, Lafayette, Marshall, Panola, Quitman and 2 more | 114 min |
| Jul 19, 11:21 PM CDT | Mesoscale Discussion | SPC | Attala, Bolivar, Calhoun, Carroll, Coahoma, Grenada and 17 more | 114 min |
| Jul 20, 2:11 PM CDT | Severe Thunderstorm Watch | SPC | Clarke, Covington, Forrest, Hinds, Jasper, Jefferson Davis and 14 more | 3 hr |
| Jul 20, 5:54 PM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Chickasaw, Coahoma, DeSoto, Itawamba and 13 more | 3 hr |
| Jul 20, 6:22 PM CDT | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 8 hr |
Nearby
Mesoscale Discussions in Mississippi, 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.