Alert archive / North Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1366
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2017, 2:32 PM MDT for 12 counties in Montana; 21 counties in North Dakota; Harding County, Perkins County, South Dakota. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2017, 2:32 PM MDT (20:32 UTC)
- Expired
- Jul 20, 2017, 3:30 PM MDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 35 counties
Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND, Harding County, SD, Perkins County, SD
The radar
The Bismarck radar (KBIS), 240 km from the middle of the area, began a volume at 20:32 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
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.5 hours before the alert went out and 240 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
- 2932 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 20, 2:50 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Dawson, Fallon, Powder River, Prairie and 4 more | 7 hr |
| Jul 20, 4:45 PM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, Richland, Sheridan, Wibaux | 90 min |
| Jul 19, 6:06 PM MDT | Mesoscale Discussion | SPC | Bon Homme, Charles Mix, Clay, Douglas, Gregory, Hutchinson and 4 more | 84 min |
Nearby
Mesoscale Discussions in North Dakota, 2017Mesoscale Discussions in Montana, 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.