Alert archive / South Dakota / Mesoscale Discussions in 2020
Mesoscale Discussion 1111
The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2020, 3:00 PM MDT for Big Horn County, Montana; 4 counties in South Dakota; 4 counties in Wyoming. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2020, 3:00 PM MDT (21:00 UTC)
- Expired
- Jul 5, 2020, 5:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 60%
Counties Big Horn County, MT, Custer County, SD, Fall River County, SD, Lawrence County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 234 km from the middle of the area, began a volume at 21:02 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
Riverton, WY (KRIW), launched 12:00Z, 9.0 hours before the alert went out and 266 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
- 14 J/kg
- Mixed-layer CIN
- -352 J/kg
- Mixed-layer LCL
- 2703 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 136 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 4, 6:50 PM MDT | Mesoscale Discussion | SPC | Custer, Garfield, McCone, Phillips, Powder River, Prairie and 1 more | 55 min |
| Jul 4, 8:46 PM MDT | Mesoscale Discussion | SPC | Carter, Daniels, Dawson, Fallon, McCone, Prairie and 5 more | 119 min |
| Jul 5, 4:13 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Powder River | 7 hr |
| Jul 4, 6:38 PM MDT | Mesoscale Discussion | SPC | Brown, Edmunds, McPherson | 67 min |
| Jul 5, 2:32 PM MDT | Mesoscale Discussion | SPC | Beadle, Brown, Buffalo, Campbell, Day, Dewey and 18 more | 118 min |
| Jul 5, 3:41 PM MDT | Severe Thunderstorm Watch | SPC | Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 13 more | 6 hr |
| Jul 5, 5:29 PM MDT | Mesoscale Discussion | SPC | Brown, Buffalo, Campbell, Corson, Day, Dewey and 12 more | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 2020Mesoscale Discussions in Wyoming, 2020Mesoscale Discussions in Montana, 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.