Alert archive / Arkansas / Mesoscale Discussions in 2011
Mesoscale Discussion 2352
The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2011, 1:46 AM CST for 23 counties in Arkansas; McCurtain County, Oklahoma. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Nov 22, 2011, 1:46 AM CST (07:46 UTC)
- Expired
- Nov 22, 2011, 2:45 AM CST
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 24 counties
Arkansas County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, McCurtain County, OK
The radar
The Little Rock radar (KLZK), 80 km from the middle of the area, began a volume at 07:50 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 nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 7.8 hours before the alert went out and 217 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
- 485 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1180 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.0
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 |
|---|---|---|---|---|
| Nov 21, 8:16 PM CST | Mesoscale Discussion | SPC | Clark, Dallas, Garland, Hempstead, Hot Spring, Howard and 7 more | 89 min |
| Nov 21, 8:36 PM CST | Tornado Watch | SPC | Arkansas, Clark, Cleveland, Dallas, Garland, Grant and 17 more | 5 hr |
| Nov 21, 10:45 PM CST | Mesoscale Discussion | SPC | Clark, Garland, Hempstead, Hot Spring, Howard, Little River and 6 more | 90 min |
Nearby
Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011
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.