Alert archive / South Dakota / Mesoscale Discussions in 2020
Mesoscale Discussion 1177
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2020, 5:31 PM MDT for Cherry County, Nebraska; 6 counties in South Dakota. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2020, 5:31 PM MDT (23:31 UTC)
- Expired
- Jul 10, 2020, 7:30 PM MDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 352
Counties Cherry County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD
The radar
The Rapid City radar (KUDX), 100 km from the middle of the area, began a volume at 23:35 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.5 hours before the alert went out and 297 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
- 757 J/kg
- Mixed-layer CIN
- -320 J/kg
- Mixed-layer LCL
- 1542 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 8:05 PM MDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Cheyenne, Deuel, Garden, Grant and 2 more | 55 min |
| Jul 10, 12:09 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Custer, Dawson, Franklin, Gosper and 5 more | 3 hr |
| Jul 10, 8:13 AM MDT | Mesoscale Discussion | SPC | Brown, Cherry, Keya Paha, Rock | 62 min |
| Jul 10, 12:26 PM MDT | Mesoscale Discussion | SPC | Keya Paha | 2 hr |
| Jul 10, 1:34 PM MDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Brown, Buffalo, Cherry and 21 more | 116 min |
| Jul 10, 2:14 PM MDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Dawes, Deuel, Garden, Grant and 4 more | 2 hr |
| Jul 10, 2:43 PM MDT | Mesoscale Discussion | SPC | Dawes, Keya Paha | 2 hr |
| Jul 10, 4:35 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Dawson, Franklin, Furnas, Gosper and 5 more | 3 hr |
| Jul 10, 1:08 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Campbell, Corson, Dewey, Haakon and 19 more | 8 hr |
Nearby
Mesoscale Discussions in South Dakota, 2020Mesoscale Discussions in Nebraska, 2020Every mesoscale discussion in 2020
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.