Alert archive / South Dakota / Mesoscale Discussions in 2012
Mesoscale Discussion 1324
The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2012, 3:53 PM CDT for Sioux County, North Dakota; 20 counties in South Dakota. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2012, 3:53 PM CDT (20:53 UTC)
- Expired
- Jun 30, 2012, 5:30 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 21 counties
Sioux County, ND, Bennett County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lawrence 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, Walworth County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 68 km from the middle of the area, began a volume at 20:53 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, 8.9 hours before the alert went out and 282 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
- 269 J/kg
- Mixed-layer CIN
- -371 J/kg
- Mixed-layer LCL
- 1200 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 419 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 17.9
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, 3:48 AM CDT | Mesoscale Discussion | SPC | McHenry, McLean, Mountrail, Sheridan, Ward, Wells | 87 min |
| Jun 30, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | Burleigh, Emmons, Kidder, Logan, McIntosh, Sioux | 5 hr |
Nearby
Mesoscale Discussions in South Dakota, 2012Mesoscale Discussions in North Dakota, 2012Every mesoscale discussion in 2012
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.