Alert archive / South Dakota / Mesoscale Discussions in 2007
Mesoscale Discussion 1634
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2007, 1:32 PM MDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2007, 1:32 PM MDT (19:32 UTC)
- Expired
- Aug 3, 2007, 4:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Carter County, MT, Powder River County, MT, Box Butte County, NE, Dawes County, NE, Grant County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Niobrara County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 106 km from the middle of the area, began a volume at 19:32 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.5 hours before the alert went out and 394 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
- 940 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 694 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 |
|---|---|---|---|---|
| Aug 3, 2:17 PM MDT | Tornado Watch | SPC | Arthur, Blaine, Brown, Cherry, Custer, Garden and 9 more | 8 hr |
| Aug 3, 4:49 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Cherry, Custer, Garden and 9 more | 116 min |
Nearby
Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Wyoming, 2007Every mesoscale discussion in 2007
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.