Alert archive / South Dakota / Mesoscale Discussions in 2020
Mesoscale Discussion 954
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2020, 1:05 PM MDT for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2020, 1:05 PM MDT (19:05 UTC)
- Expired
- Jun 21, 2020, 3:30 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 28 counties
Carter County, MT, Fallon County, MT, Adams County, ND, Bowman County, ND, Cherry County, NE, Dawes County, NE, Sheridan County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Dewey County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Stanley County, SD, Todd County, SD, Ziebach County, SD, Crook County, WY, Niobrara County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 40 km from the middle of the area, began a volume at 19:04 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 nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 7.1 hours before the alert went out and 337 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
- 4 J/kg
- Mixed-layer CIN
- -244 J/kg
- Mixed-layer LCL
- 1899 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 97 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 |
|---|---|---|---|---|
| Jun 21, 1:19 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 40 more | 116 min |
| Jun 21, 2:19 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Blaine, Boone, Buffalo, Burt and 51 more | 7 hr |
| Jun 21, 5:59 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 46 more | 2 hr |
| Jun 20, 6:28 PM MDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 16 more | 2 hr |
| Jun 21, 1:44 PM MDT | Mesoscale Discussion | SPC | Lake, Lincoln, McCook, Minnehaha, Moody, Turner | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 2020Mesoscale Discussions in Nebraska, 2020Mesoscale Discussions in Wyoming, 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.