Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1771
The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2011, 1:05 PM MDT for Carter County, Montana; 14 counties in North Dakota; 16 counties in South Dakota. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2011, 1:05 PM MDT (19:05 UTC)
- Expired
- Jul 28, 2011, 3:00 PM MDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 31 counties
Carter County, MT, Adams County, ND, Barnes County, ND, Bowman County, ND, Cass County, ND, Dickey County, ND, Griggs County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Ransom County, ND, Sargent County, ND, Slope County, ND, Steele County, ND, Stutsman County, ND, Brown County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Harding County, SD, Lawrence County, SD, McPherson County, SD, Meade County, SD, Perkins County, SD, Potter County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 108 km from the middle of the area, began a volume at 19:07 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, 7.1 hours before the alert went out and 109 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
- 135 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1472 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 43 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 |
|---|---|---|---|---|
| Jul 27, 6:09 PM MDT | Mesoscale Discussion | SPC | Dewey, Haakon, Jackson, Jones, Meade, Pennington and 2 more | 2 hr |
| Jul 28, 2:31 PM MDT | Severe Thunderstorm Watch | SPC | Buffalo, Butte, Campbell, Corson, Custer, Dewey and 21 more | 5 hr |
| Jul 28, 5:19 PM MDT | Mesoscale Discussion | SPC | Buffalo, Butte, Dewey, Haakon, Hughes, Hyde and 9 more | 86 min |
Nearby
Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in North Dakota, 2011Mesoscale Discussions in Montana, 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.