Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 1711
The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2017, 4:21 AM CDT for 14 counties in Iowa; Atchison County, Missouri; 8 counties in Nebraska. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Oct 14, 2017, 4:21 AM CDT (09:21 UTC)
- Expired
- Oct 14, 2017, 5:45 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 23 counties
Adair County, IA, Adams County, IA, Cass County, IA, Clarke County, IA, Fremont County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Atchison County, MO, Cass County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE
The radar
The Omaha radar (KOAX), 108 km from the middle of the area, began a volume at 09:22 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
Davenport, (KDVN), launched 00:00Z, 9.4 hours before the alert went out and 400 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1013 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 332 m²/s²
- 0-3 km storm-relative helicity
- 810 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Oct 14, 3:35 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 3 more | 2 hr |
| Oct 14, 5:09 PM CDT | Tornado Watch | SPC | Des Moines, Henry, Lee, Louisa, Muscatine, Scott and 1 more | 8 hr |
| Oct 14, 2:40 PM CDT | Mesoscale Discussion | SPC | Platte | 3 hr |
| Oct 14, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Vernon | 5 hr |
| Oct 14, 6:23 PM CDT | Mesoscale Discussion | SPC | Audrain, Bates, Benton, Boone, Callaway, Cole and 14 more | 97 min |
Nearby
Mesoscale Discussions in Iowa, 2017Mesoscale Discussions in Nebraska, 2017Mesoscale Discussions in Missouri, 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.