Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1453
The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2011, 2:19 PM MDT for 7 counties in Nebraska; 9 counties in South Dakota; Weston County, Wyoming. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2011, 2:19 PM MDT (20:19 UTC)
- Expired
- Jun 30, 2011, 3:15 PM MDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
Counties Arthur County, NE, Cherry County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Thomas County, NE, Bennett County, SD, Custer County, SD, Haakon County, SD, Jackson County, SD, Lawrence County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Todd County, SD, Weston County, WY
The radar
The Rapid City radar (KUDX), 136 km from the middle of the area, began a volume at 20:19 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 (KUNR), launched 12:00Z, 8.3 hours before the alert went out and 131 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3151 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -192 m²/s²
- 0-3 km storm-relative helicity
- -86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 11:57 AM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Kimball, Morrill, Scotts Bluff and 1 more | 63 min |
| Jun 30, 12:18 PM MDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 9 hr |
| Jun 30, 1:49 PM MDT | Mesoscale Discussion | SPC | Banner, Kimball, Scotts Bluff, Sioux | 116 min |
| Jun 30, 4:17 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 18 more | 118 min |
| Jun 30, 4:39 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Brown, Cherry, Deuel, Garden, Grant and 9 more | 5 hr |
Nearby
Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in Wyoming, 2011Every mesoscale discussion in 2011
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.