Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 1877
The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2011, 8:10 PM CDT for 51 counties in Iowa; 14 counties in Missouri; 29 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2011, 8:10 PM CDT (01:10 UTC)
- Expired
- Aug 6, 2011, 10:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 94 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Harrison County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Keokuk County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Woodbury County, IA, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Putnam County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Nance County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, York County, NE
The radar
The Des Moines radar (KDMX), 112 km from the middle of the area, began a volume at 01:12 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
Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 126 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
- 3454 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1012 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 13.5
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 6, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | Appanoose, Cedar, Davis, Des Moines, Henry, Iowa and 16 more | 5 hr |
| Aug 6, 11:06 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 25 more | 114 min |
| Aug 7, 10:48 AM CDT | Mesoscale Discussion | SPC | Platte | 117 min |
| Aug 7, 12:55 PM CDT | Severe Thunderstorm Watch | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Clay and 11 more | 5 hr |
| Aug 7, 3:16 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Carroll, Cass and 24 more | 119 min |
| Aug 7, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Benton, Boone, Callaway, Camden, Cedar and 18 more | 6 hr |
| Aug 7, 5:20 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Benton, Bollinger, Boone, Callaway and 48 more | 115 min |
| Aug 7, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Franklin, Iron and 17 more | 6 hr |
| Aug 7, 6:07 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Christian, Douglas, Greene, Howell, Jasper and 11 more | 5 hr |
| Aug 7, 1:23 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Cherry, Custer, Grant and 5 more | 67 min |
| Aug 7, 2:58 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Brown, Buffalo, Cherry, Custer and 21 more | 8 hr |
| Aug 7, 6:35 PM CDT | Mesoscale Discussion | SPC | Adams, Arthur, Blaine, Boyd, Brown, Buffalo and 25 more | 115 min |
Nearby
Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in Missouri, 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.