Alert archive / South Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1659
The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2017, 8:56 PM CDT for 18 counties in Minnesota; 26 counties in North Dakota; 34 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 19, 2017, 8:56 PM CDT (01:56 UTC)
- Expired
- Sep 19, 2017, 11:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 78 counties
Becker County, MN, Big Stone County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Kittson County, MN, Lac qui Parle County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Stevens County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Benson County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Traill County, ND, Walsh County, ND, Wells County, ND, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Miner County, SD, Moody County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 39 km from the middle of the area, began a volume at 01:55 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.9 hours before the alert went out and 84 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
- 2563 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1127 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 239 m²/s²
- Significant tornado parameter
- 2.6
- Supercell composite
- 16.8
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 |
|---|---|---|---|---|
| Sep 19, 10:10 PM CDT | Mesoscale Discussion | SPC | Benton, Blue Earth, Brown, Carver, Cass, Chippewa and 37 more | 35 min |
| Sep 19, 10:36 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Benton, Brown, Cass, Chippewa and 30 more | 4 hr |
| Sep 20, 1:03 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Hennepin and 18 more | 87 min |
| Sep 20, 1:22 AM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Carlton, Carver, Chisago, Hennepin and 8 more | 4 hr |
Nearby
Mesoscale Discussions in South Dakota, 2017Mesoscale Discussions in North 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.