Alert archive / North Dakota / Mesoscale Discussions in 2017
Mesoscale Discussion 1370
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2017, 4:45 PM MDT for 6 counties in Montana; 16 counties in North Dakota; Harding County, Perkins County, South Dakota. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2017, 4:45 PM MDT (22:45 UTC)
- Expired
- Jul 20, 2017, 6:15 PM MDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 24 counties
Carter County, MT, Dawson County, MT, Fallon County, MT, Richland 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, Hettinger County, ND, McKenzie County, ND, Mercer County, ND, Mountrail County, ND, Renville 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), 238 km from the middle of the area, began a volume at 22:48 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 12:00Z, 10.8 hours before the alert went out and 243 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
- 24 J/kg
- Mixed-layer CIN
- -373 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 107 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, 2:32 PM MDT | Mesoscale Discussion | SPC | Carter, Custer, Daniels, Dawson, Fallon, McCone and 6 more | 58 min |
| Jul 20, 2:50 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Dawson, Fallon, Powder River, Prairie and 4 more | 7 hr |
| 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.