Alert archive / Nebraska / Mesoscale Discussions in 2007
Mesoscale Discussion 1940
The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2007, 5:59 PM CDT for 5 states. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2007, 5:59 PM CDT (22:59 UTC)
- Expired
- Sep 6, 2007, 7:30 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 38 counties
Cherokee County, IA, Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Plymouth County, IA, Pottawattamie County, IA, Sioux County, IA, Woodbury County, IA, Brown County, KS, Marshall County, KS, Nemaha County, KS, Atchison County, MO, Holt County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thurston County, NE, Washington County, NE, Union County, SD
The radar
The Omaha radar (KOAX), 23 km from the middle of the area, began a volume at 23:02 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
Topeka, KS (KTOP), launched 12:00Z, 11.0 hours before the alert went out and 244 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
- 347 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 110 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 |
|---|---|---|---|---|
| Sep 6, 6:19 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 7 hr |
| Sep 6, 3:11 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Graham, Logan, Norton and 5 more | 94 min |
| Sep 6, 4:48 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Logan and 9 more | 6 hr |
| Sep 6, 5:23 PM CDT | Mesoscale Discussion | SPC | Cherry, Hooker, Keya Paha, Thomas | 97 min |
Nearby
Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Kansas, 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.