Alert archive / South Dakota / Mesoscale Discussions in 2011
Mesoscale Discussion 1504
The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2011, 7:59 PM CDT for 34 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2011, 7:59 PM CDT (00:59 UTC)
- Expired
- Jul 4, 2011, 10:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 34 counties
Beadle County, SD, Bennett County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Fall River County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD, Ziebach County, SD
The radar
The Aberdeen radar (KABR), 199 km from the middle of the area, began a volume at 01:02 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
Aberdeen, SD (KABR), launched 00:00Z, 1.0 hours before the alert went out and 161 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
- 3256 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1088 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 9.4
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 |
|---|---|---|---|---|
| Jul 4, 11:14 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bon Homme, Brown, Brule, Buffalo and 32 more | 91 min |
| Jul 4, 11:41 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 32 more | 5 hr |
| Jul 5, 2:17 PM CDT | Mesoscale Discussion | SPC | Bennett, Custer, Fall River, Jackson, Mellette, Oglala Lakota and 1 more | 73 min |
| Jul 5, 3:32 PM CDT | Mesoscale Discussion | SPC | Clay, Lincoln, Turner, Union | 88 min |
Nearby
Mesoscale Discussions in South Dakota, 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.