Alert archive / South Dakota / Mesoscale Discussions in 2018
Mesoscale Discussion 905
The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2018, 7:25 AM CDT for 24 counties in South Dakota. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2018, 7:25 AM CDT (12:25 UTC)
- Expired
- Jun 27, 2018, 9:00 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 24 counties
Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Stanley County, SD, Sully County, SD, Turner County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 185 km from the middle of the area, began a volume at 12:26 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, 0.4 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
- 151 J/kg
- Mixed-layer CIN
- -389 J/kg
- Mixed-layer LCL
- 1542 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -55 m²/s²
- 0-3 km storm-relative helicity
- 67 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 26, 9:05 PM CDT | Mesoscale Discussion | SPC | Harding, Perkins | 115 min |
| Jun 26, 11:52 PM CDT | Mesoscale Discussion | SPC | Brule, Buffalo, Campbell, Corson, Dewey, Haakon and 15 more | 113 min |
| Jun 27, 12:12 AM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Butte, Campbell, Corson, Dewey, Edmunds and 17 more | 9 hr |
| Jun 27, 2:18 AM CDT | Mesoscale Discussion | SPC | Buffalo, Butte, Campbell, Corson, Dewey, Edmunds and 17 more | 87 min |
| Jun 27, 4:18 AM CDT | Mesoscale Discussion | SPC | Aurora, Brule, Buffalo, Charles Mix, Davison, Douglas and 10 more | 87 min |
| Jun 27, 4:34 AM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bon Homme, Brule, Charles Mix, Davison and 10 more | 5 hr |
Nearby
Mesoscale Discussions in South Dakota, 2018Every mesoscale discussion in 2018
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.