Alert archive / Louisiana / Mesoscale Discussions in 2018
Mesoscale Discussion 245
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 6:50 PM CDT for 5 counties in Arkansas; 13 parishes in Louisiana; 4 counties in Mississippi. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2018, 6:50 PM CDT (23:50 UTC)
- Expired
- Apr 13, 2018, 8:45 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 22 counties
Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Caldwell Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Issaquena County, MS, Sunflower County, MS, Washington County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 185 km from the middle of the area, began a volume at 23:50 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
Shreveport, LA (KBAD), launched 12:00Z, 11.8 hours before the alert went out and 182 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
- 81 J/kg
- Mixed-layer CIN
- -535 J/kg
- Mixed-layer LCL
- 655 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 283 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 |
|---|---|---|---|---|
| Apr 13, 12:39 PM CDT | Mesoscale Discussion | SPC | Benton | 2 hr |
| Apr 13, 12:41 PM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Conway and 24 more | 2 hr |
| Apr 13, 1:20 PM CDT | Tornado Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 9 hr |
| Apr 13, 1:50 PM CDT | Tornado Watch | SPC | Baxter, Boone, Bradley, Calhoun, Clark, Cleburne and 43 more | 8 hr |
| Apr 13, 3:43 PM CDT | Mesoscale Discussion | SPC | Benton, Washington | 92 min |
| Apr 13, 5:53 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 63 more | 97 min |
Nearby
Mesoscale Discussions in Louisiana, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale 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.