Alert archive / North Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1389
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2017, 10:34 PM CDT for 30 counties in North Dakota; 12 counties in South Dakota. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2017, 10:34 PM CDT (03:34 UTC)
- Expired
- Jul 21, 2017, 11:30 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 42 counties
Barnes County, ND, Benson County, ND, Burleigh County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, Morton County, ND, Nelson County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Rolette County, ND, Sargent County, ND, Sheridan County, ND, Sioux County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Walsh County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Clark County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Sully County, SD, Walworth County, SD
The radar
The Bismarck radar (KBIS), 131 km from the middle of the area, began a volume at 03:35 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 3.6 hours before the alert went out and 126 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
- 2130 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1710 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.7
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 |
|---|---|---|---|---|
| Jul 21, 7:46 PM CDT | Mesoscale Discussion | SPC | Barnes, Bottineau, Burke, Burleigh, Cavalier, Dickey and 22 more | 89 min |
| Jul 21, 7:34 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Codington, Deuel, Grant, Hamlin | 6 hr |
| Jul 21, 10:16 PM CDT | Mesoscale Discussion | SPC | Aurora, Brookings, Brule, Charles Mix, Davison, Douglas and 11 more | 89 min |
Nearby
Mesoscale Discussions in North Dakota, 2017Mesoscale Discussions in South Dakota, 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.