Alert archive / Louisiana / Mesoscale Discussions in 2019
Mesoscale Discussion 2178
The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2019, 2:10 PM CST for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 30, 2019, 2:10 PM CST (20:10 UTC)
- Expired
- Nov 30, 2019, 4:15 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 38 counties
Ashley County, AR, Bradley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Humphreys County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS, Sabine County, TX, San Augustine County, TX
The radar
The Shreveport radar (KSHV), 152 km from the middle of the area, began a volume at 20:09 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 (KSHV), launched 12:00Z, 8.2 hours before the alert went out and 143 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
- 320 J/kg
- Mixed-layer CIN
- -311 J/kg
- Mixed-layer LCL
- 606 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 487 m²/s²
- 0-3 km storm-relative helicity
- 527 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
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 |
|---|---|---|---|---|
| Nov 30, 4:45 AM CST | Mesoscale Discussion | SPC | Polk | 2 hr |
| Nov 30, 9:46 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 12 more | 3 hr |
| Nov 30, 11:38 AM CST | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more | 7 hr |
| Nov 30, 2:31 PM CST | Mesoscale Discussion | SPC | Lee, Phillips | 59 min |
| Nov 30, 3:54 PM CST | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Tensas | 7 hr |
Nearby
Mesoscale Discussions in Louisiana, 2019Mesoscale Discussions in Mississippi, 2019Mesoscale Discussions in Arkansas, 2019Every mesoscale discussion in 2019
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.