Alert archive / Louisiana / Mesoscale Discussions in 2013
Mesoscale Discussion 670
The Storm Prediction Center issued this mesoscale discussion at May 17, 2013, 4:00 PM CDT for 11 counties in Arkansas; 14 parishes in Louisiana; 6 counties in Mississippi. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- May 17, 2013, 4:00 PM CDT (21:00 UTC)
- Expired
- May 17, 2013, 5:00 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 31 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Drew County, AR, Lafayette County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Caldwell Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Claiborne County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Sharkey County, MS, Warren County, MS
The radar
The Shreveport radar (KSHV), 169 km from the middle of the area, began a volume at 21:01 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 nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 9.0 hours before the alert went out and 299 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
- 109 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, 7:24 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Drew, Union | 96 min |
| 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, 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.