Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 706
The Storm Prediction Center issued this mesoscale discussion at May 12, 2017, 10:59 AM CDT for 26 counties in Arkansas; Morehouse Parish, West Carroll Parish, Louisiana; 4 counties in Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 12, 2017, 10:59 AM CDT (15:59 UTC)
- Expired
- May 12, 2017, 1:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 32 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Union County, AR, Morehouse Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Coahoma County, MS, Sunflower County, MS, Washington County, MS
The radar
The Little Rock radar (KLZK), 93 km from the middle of the area, began a volume at 16:00 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 (KBYH), launched 12:00Z, 4.0 hours before the alert went out and 203 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
- 113 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| May 12, 4:24 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more | 3 hr |
| May 12, 9:56 AM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 8 more | 3 hr |
| May 12, 10:35 AM CDT | Severe Thunderstorm Watch | SPC | Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 5 more | 5 hr |
| May 12, 1:42 PM CDT | Mesoscale Discussion | SPC | Saint Bernard | 108 min |
| May 12, 1:43 PM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 12 more | 3 hr |
Nearby
Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Louisiana, 2017Every mesoscale discussion in 2017
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.