Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 500
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2017, 7:22 PM CDT for 4 states. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2017, 7:22 PM CDT (00:22 UTC)
- Expired
- Apr 15, 2017, 8:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 70 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Buchanan County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Grundy County, IA, Guthrie County, IA, Hardin County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Linn County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe 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, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Atchison County, KS, Brown County, KS, Dickinson County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Wabaunsee County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clinton 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, Worth County, MO, Nemaha County, NE, Pawnee County, NE, Richardson County, NE
The radar
The Des Moines radar (KDMX), 152 km from the middle of the area, began a volume at 00:22 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, 0.4 hours before the alert went out and 161 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
- 1034 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1322 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 7:02 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Ellsworth, Harvey, Kingman, Lincoln, McPherson and 5 more | 5 hr |
| Apr 15, 7:35 PM CDT | Mesoscale Discussion | SPC | Barber, Clark, Comanche, Edwards, Ford, Gray and 6 more | 85 min |
| Apr 15, 9:20 PM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Barber, Barton, Butler, Chase and 40 more | 85 min |
| Apr 16, 2:02 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Dunklin, Madison, Mississippi and 8 more | 2 hr |
Nearby
Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Kansas, 2017Every mesoscale discussion in 2017
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.