Alert archive / South Dakota / Mesoscale Discussions in 2018
Mesoscale Discussion 903
The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2018, 2:18 AM CDT for Emmons County, McIntosh County, Sioux County, North Dakota; 23 counties in South Dakota. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2018, 2:18 AM CDT (07:18 UTC)
- Expired
- Jun 27, 2018, 3:45 AM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 26 counties
Emmons County, ND, McIntosh County, ND, Sioux County, ND, Buffalo County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, McPherson County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 141 km from the middle of the area, began a volume at 07:22 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
Rapid City, SD (KRAP), launched 00:00Z, 7.3 hours before the alert went out and 148 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
- 1573 J/kg
- Mixed-layer CIN
- -153 J/kg
- Mixed-layer LCL
- 2012 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.3
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 26, 9:05 PM CDT | Mesoscale Discussion | SPC | Adams, Bottineau, Bowman, Dunn, Grant, Hettinger and 12 more | 115 min |
| Jun 27, 12:12 AM CDT | Severe Thunderstorm Watch | SPC | Emmons, McIntosh, Sioux | 9 hr |
| Jun 26, 11:52 PM CDT | Mesoscale Discussion | SPC | Brule, Buffalo, Campbell, Corson, Dewey, Haakon and 15 more | 113 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 |
| Jun 27, 7:25 AM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 18 more | 95 min |
Nearby
Mesoscale Discussions in South Dakota, 2018Mesoscale Discussions in North 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.