Alert archive / South Dakota / Mesoscale Discussions in 2020
Mesoscale Discussion 948
The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2020, 7:28 PM CDT for 22 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2020, 7:28 PM CDT (00:28 UTC)
- Expired
- Jun 20, 2020, 9:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 286
All 22 counties
Aurora County, SD, Beadle County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lyman County, SD, Marshall County, SD, Miner County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 128 km from the middle of the area, began a volume at 00:32 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 00:00Z, 0.5 hours before the alert went out and 66 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
- 708 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 1443 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.3
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, 2:05 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Custer, Dewey, Fall River, Haakon and 12 more | 2 hr |
| Jun 21, 2:19 PM CDT | Mesoscale Discussion | SPC | Clay, Union | 116 min |
| Jun 21, 2:44 PM CDT | Mesoscale Discussion | SPC | Lake, Lincoln, McCook, Minnehaha, Moody, Turner | 2 hr |
| Jun 21, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Union | 7 hr |
| Jun 21, 6:59 PM CDT | Mesoscale Discussion | SPC | Clay, Union | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 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.