Alert archive / South Dakota / Mesoscale Discussions in 2018
Mesoscale Discussion 546
The Storm Prediction Center issued this mesoscale discussion at May 27, 2018, 5:06 PM MDT for 28 counties in South Dakota; Campbell County, Crook County, Weston County, Wyoming. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2018, 5:06 PM MDT (23:06 UTC)
- Expired
- May 27, 2018, 6:30 PM MDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 31 counties
Bennett County, SD, Buffalo County, SD, Butte County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Fall River County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 48 km from the middle of the area, began a volume at 23:09 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.1 hours before the alert went out and 321 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
- 1 J/kg
- Mixed-layer CIN
- -557 J/kg
- Mixed-layer LCL
- 1786 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -148 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 |
|---|---|---|---|---|
| May 26, 9:13 PM MDT | Mesoscale Discussion | SPC | Harding, Perkins | 2 hr |
| May 27, 4:42 PM MDT | Mesoscale Discussion | SPC | Fall River | 93 min |
| May 27, 5:27 PM MDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Dewey, Fall River, Haakon and 16 more | 6 hr |
| May 27, 11:36 AM MDT | Mesoscale Discussion | SPC | Albany, Carbon, Converse, Fremont, Hot Springs, Johnson and 4 more | 2 hr |
| May 27, 12:05 PM MDT | Severe Thunderstorm Watch | SPC | Albany, Carbon, Converse, Fremont, Goshen, Laramie and 3 more | 9 hr |
| May 27, 2:25 PM MDT | Mesoscale Discussion | SPC | Albany, Carbon, Converse, Fremont, Goshen, Laramie and 2 more | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 2018Mesoscale Discussions in Wyoming, 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.