Alert archive / Louisiana / Mesoscale Discussions in 2013
Mesoscale Discussion 665
The Storm Prediction Center issued this mesoscale discussion at May 16, 2013, 7:24 PM CDT for 6 counties in Arkansas; 10 parishes in Louisiana; Issaquena County, Sharkey County, Washington County, Mississippi. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- May 16, 2013, 7:24 PM CDT (00:24 UTC)
- Expired
- May 16, 2013, 9:00 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Drew County, AR, Union County, AR, Claiborne Parish, LA, East Carroll Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Issaquena County, MS, Sharkey County, MS, Washington County, MS
The radar
The Shreveport radar (KSHV), 163 km from the middle of the area, began a volume at 00:24 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 00:00Z, 0.4 hours before the alert went out and 154 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
- 771 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 358 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:59 PM CDT | Tornado Watch | SPC | Ashley, Chicot, Union | 4 hr |
| May 16, 10:59 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot | 61 min |
| May 17, 4:00 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 5 more | 60 min |
| May 17, 1:39 PM CDT | Mesoscale Discussion | SPC | Attala, Carroll, Choctaw, Clarke, Clay, Holmes and 18 more | 96 min |
| May 17, 5:45 PM CDT | Mesoscale Discussion | SPC | Kemper, Lauderdale, Noxubee | 60 min |
Nearby
Mesoscale Discussions in Louisiana, 2013Mesoscale Discussions in Arkansas, 2013Mesoscale Discussions in Mississippi, 2013Every mesoscale discussion in 2013
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.