Alert archive / Iowa / Mesoscale Discussions in 2015
Mesoscale Discussion 1771
The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2015, 11:41 PM CDT for 44 counties in Iowa; Atchison County, Nodaway County, Worth County, Missouri; 8 counties in Nebraska. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2015, 11:41 PM CDT (04:41 UTC)
- Expired
- Sep 7, 2015, 12:45 AM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 55 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cass County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Dallas County, IA, Decatur County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Howard County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Winneshiek County, IA, Atchison County, MO, Nodaway County, MO, Worth County, MO, Cass County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE
The radar
The Des Moines radar (KDMX), 20 km from the middle of the area, began a volume at 04:44 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 208 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
- 1563 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 1693 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 21.9
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, 8:42 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 44 more | 93 min |
| Sep 7, 2:18 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Page | 87 min |
| Sep 7, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Franklin, Gage, Jefferson, Johnson, Nuckolls, Pawnee and 3 more | 6 hr |
| Sep 7, 5:46 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Chase, Cherry, Cheyenne and 22 more | 119 min |
| Sep 7, 6:23 PM CDT | Mesoscale Discussion | SPC | Gage, Jefferson, Nuckolls, Pawnee, Thayer, Webster | 97 min |
| Sep 7, 6:50 PM CDT | Severe Thunderstorm Watch | SPC | Chase, Custer, Dawson, Dundy, Frontier, Furnas and 7 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in Nebraska, 2015Mesoscale Discussions in Missouri, 2015Every mesoscale discussion in 2015
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.