Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1868
The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2011, 6:26 PM CDT for 16 counties in North Dakota; 23 counties in South Dakota. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Aug 5, 2011, 6:26 PM CDT (23:26 UTC)
- Expired
- Aug 5, 2011, 8:00 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 39 counties
Burleigh County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Stutsman County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 107 km from the middle of the area, began a volume at 23:27 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.4 hours before the alert went out and 107 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
- 825 J/kg
- Mixed-layer CIN
- -179 J/kg
- Mixed-layer LCL
- 1272 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 87 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 |
|---|---|---|---|---|
| Aug 4, 7:40 PM CDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Dunn, Golden Valley, Hettinger and 2 more | 95 min |
| Aug 5, 1:05 PM CDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Emmons, Golden Valley, Grant and 5 more | 2 hr |
| Aug 5, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bowman, Burleigh, Dunn, Emmons and 12 more | 7 hr |
| Aug 5, 5:25 PM CDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Burleigh, Dunn, Golden Valley and 9 more | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in North Dakota, 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.