Alert archive / Nebraska / Mesoscale Discussions in 2017
Mesoscale Discussion 1667
The Storm Prediction Center issued this mesoscale discussion at Sep 22, 2017, 3:57 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 22, 2017, 3:57 PM CDT (20:57 UTC)
- Expired
- Sep 22, 2017, 6:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 47 counties
Lyon County, IA, Sioux County, IA, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boone County, NE, Buffalo County, NE, Cedar County, NE, Custer County, NE, Dawson County, NE, Dixon County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Sherman County, NE, Stanton County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Brookings County, SD, Clay County, SD, Codington County, SD, Deuel County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 177 km from the middle of the area, began a volume at 21:02 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
Aberdeen, SD (KABR), launched 12:00Z, 9.0 hours before the alert went out and 264 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
- 2346 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 803 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
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 |
|---|---|---|---|---|
| Sep 21, 11:34 PM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Big Stone, Chisago, Crow Wing, Douglas and 12 more | 116 min |
| Sep 22, 4:10 AM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cass, Crow Wing, Morrison, Otter Tail and 3 more | 3 hr |
Nearby
Mesoscale Discussions in Nebraska, 2017Mesoscale Discussions in South Dakota, 2017Mesoscale Discussions in Minnesota, 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.