Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 2228
The Storm Prediction Center issued this mesoscale discussion at Oct 6, 2011, 7:45 PM MDT for 8 counties in Nebraska; 15 counties in South Dakota. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Oct 6, 2011, 7:45 PM MDT (01:45 UTC)
- Expired
- Oct 6, 2011, 9:15 PM MDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 23 counties
Arthur County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Logan County, NE, McPherson County, NE, Thomas County, NE, Bennett County, SD, Custer County, SD, Dewey County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD
The radar
The North Platte radar (KLNX), 144 km from the middle of the area, began a volume at 01:47 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
Rapid City, SD (KUNR), launched 00:00Z, 1.8 hours before the alert went out and 157 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
- 192 J/kg
- Mixed-layer CIN
- -179 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 222 m²/s²
- 0-3 km storm-relative helicity
- 432 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Oct 6, 7:29 PM MDT | Severe Thunderstorm Watch | SPC | Dundy, Hitchcock, Red Willow | 5 hr |
| Oct 6, 10:08 PM MDT | Mesoscale Discussion | SPC | Frontier, Furnas, Red Willow | 97 min |
| Oct 6, 11:42 PM MDT | Mesoscale Discussion | SPC | Adams, Franklin, Furnas, Harlan, Kearney, Phelps and 1 more | 93 min |
| Oct 7, 1:24 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Cedar, Clay and 21 more | 96 min |
| Oct 7, 5:33 PM MDT | Tornado Watch | SPC | Hitchcock, Red Willow | 7 hr |
| Oct 7, 5:45 PM MDT | Tornado Watch | SPC | Adams, Antelope, Boone, Buffalo, Colfax, Custer and 24 more | 7 hr |
Nearby
Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in Nebraska, 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.