Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1943
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2011, 12:49 PM MDT for 14 counties in North Dakota; 21 counties in South Dakota. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2011, 12:49 PM MDT (18:49 UTC)
- Expired
- Aug 11, 2011, 2:15 PM MDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 35 counties
Adams County, ND, Burleigh County, ND, Dickey County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Brown County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, McPherson County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 135 km from the middle of the area, began a volume at 18:50 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 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, 6.8 hours before the alert went out and 136 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
- 218 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 1293 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
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 11, 2:05 PM MDT | Tornado Watch | SPC | Aurora, Beadle, Bennett, Bon Homme, Brule, Buffalo and 33 more | 5 hr |
| Aug 11, 5:38 PM MDT | Mesoscale Discussion | SPC | Bon Homme, Clay, Lincoln, Turner, Union, Yankton | 97 min |
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.