Alert archive / Nebraska / Mesoscale Discussions in 2004
Mesoscale Discussion 1870
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 9:16 PM CDT for 15 counties in Iowa; 18 counties in Nebraska. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 9:16 PM CDT (02:16 UTC)
- Expired
- Aug 3, 2004, 10:15 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 33 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Taylor County, IA, Union County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Lancaster County, NE, Madison County, NE, Otoe County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Washington County, NE, York County, NE
The radar
The Omaha radar (KOAX), 68 km from the middle of the area, began a volume at 02:16 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 00:00Z, 2.3 hours before the alert went out and 248 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
- 4543 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1505 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 14.3
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, 8:19 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Boone, Cedar, Clarke, Clinton and 33 more | 56 min |
| Aug 3, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Des Moines and 18 more | 5 hr |
| Aug 3, 11:34 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Lee | 86 min |
| Aug 4, 1:42 AM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Des Moines and 17 more | 2 hr |
| Aug 4, 4:22 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Dawes, Kimball, Scotts Bluff, Sioux | 2 hr |
Nearby
Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion in 2004
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.