Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1620
The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2011, 8:46 PM MDT for 7 counties in North Dakota; 11 counties in South Dakota. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Jul 14, 2011, 8:46 PM MDT (02:46 UTC)
- Expired
- Jul 14, 2011, 9:45 PM MDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
Counties Adams County, ND, Emmons County, ND, Grant County, ND, Kidder County, ND, Logan County, ND, McIntosh County, ND, Sioux County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Harding County, SD, McPherson County, SD, Perkins County, SD, Potter County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 128 km from the middle of the area, began a volume at 02:48 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 00:00Z, 2.8 hours before the alert went out and 128 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
- 2132 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 698 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.2
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 |
|---|---|---|---|---|
| Jul 14, 10:01 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bowman, Burke, Divide, Dunn and 14 more | 6 hr |
| Jul 14, 10:55 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, Emmons, Kidder, LaMoure and 6 more | 65 min |
| Jul 15, 1:54 AM MDT | Mesoscale Discussion | SPC | Adams, Billings, Bottineau, Bowman, Burke, Divide and 12 more | 2 hr |
| Jul 15, 1:56 AM MDT | Severe Thunderstorm Watch | SPC | Barnes, Cass, Grand Forks, Griggs, Nelson, Ramsey and 6 more | 7 hr |
| Jul 15, 5:30 AM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Ransom, Richland | 2 hr |
| Jul 15, 5:10 PM MDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, LaMoure, Ransom, Richland and 2 more | 65 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.