Alert archive / Iowa / Mesoscale Discussions in 2017
Mesoscale Discussion 1697
The Storm Prediction Center issued this mesoscale discussion at Oct 6, 2017, 8:23 PM CDT for 17 counties in Iowa; Atchison County, Nodaway County, Missouri; Cass County, Nemaha County, Otoe County, Nebraska. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Oct 6, 2017, 8:23 PM CDT (01:23 UTC)
- Expired
- Oct 6, 2017, 10:00 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 22 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Dallas County, IA, Fremont County, IA, Guthrie County, IA, Madison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Atchison County, MO, Nodaway County, MO, Cass County, NE, Nemaha County, NE, Otoe County, NE
The radar
The Des Moines radar (KDMX), 119 km from the middle of the area, began a volume at 01:24 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, 1.4 hours before the alert went out and 130 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
- 571 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 374 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.9
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 6, 9:54 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Dallas, Fremont and 11 more | 96 min |
| Oct 7, 4:40 PM CDT | Mesoscale Discussion | SPC | Cape Girardeau, Mississippi, Scott | 3 hr |
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.