Alert archive / South Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1373
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2017, 7:31 PM CDT for 4 counties in North Dakota; 6 counties in South Dakota. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2017, 7:31 PM CDT (00:31 UTC)
- Expired
- Jul 20, 2017, 9:00 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
Counties Emmons County, ND, Grant County, ND, Morton County, ND, Sioux County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Meade County, SD, Perkins County, SD, Ziebach County, SD
The radar
The Bismarck radar (KBIS), 153 km from the middle of the area, began a volume at 00:30 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 0.5 hours before the alert went out and 156 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
- 276 J/kg
- Mixed-layer CIN
- -184 J/kg
- Mixed-layer LCL
- 2612 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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, 9:42 AM CDT | Mesoscale Discussion | SPC | Benson, Cavalier, Eddy, Grand Forks, McHenry, Nelson and 6 more | 93 min |
| Jul 21, 12:47 PM CDT | Mesoscale Discussion | SPC | Grand Forks, Pembina, Traill, Walsh | 88 min |
| Jul 21, 2:20 PM CDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, Eddy, Emmons, Foster and 13 more | 2 hr |
| Jul 21, 3:07 PM CDT | Severe Thunderstorm Watch | SPC | Barnes, Bottineau, Burleigh, Cass, Dickey, Eddy and 23 more | 10 hr |
| Jul 21, 3:53 PM CDT | Mesoscale Discussion | SPC | Barnes, Cass, Dickey, Eddy, Emmons, Foster and 13 more | 97 min |
| Jul 21, 6:25 PM CDT | Mesoscale Discussion | SPC | Richland | 95 min |
| Jul 20, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Campbell, Edmunds, Faulk, Hand, Hyde and 5 more | 3 hr |
| Jul 20, 11:25 PM CDT | Mesoscale Discussion | SPC | Brown, Campbell, Edmunds, Faulk, McPherson, Potter and 3 more | 65 min |
Nearby
Mesoscale Discussions in South Dakota, 2017Mesoscale Discussions in North 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.