Alert archive / Montana / Mesoscale Discussions in 2013
Mesoscale Discussion 1350
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2013, 4:58 PM MDT for 34 counties in Montana; 23 counties in North Dakota; Harding County, South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2013, 4:58 PM MDT (22:58 UTC)
- Expired
- Jul 8, 2013, 7:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 58 counties
Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Jefferson County, MT, Judith Basin County, MT, Madison County, MT, McCone County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT, Yellowstone County, MT, Adams County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sheridan County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND, Harding County, SD
The radar
The Glasgow radar (KGGW), 177 km from the middle of the area, began a volume at 23:00 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, 11.0 hours before the alert went out and 178 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
- 467 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 1005 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.5
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:31 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter and 31 more | 119 min |
| Jul 8, 9:21 AM MDT | Mesoscale Discussion | SPC | Blaine, Cascade, Chouteau, Hill, Liberty, Phillips and 1 more | 84 min |
| Jul 8, 12:05 PM MDT | Mesoscale Discussion | SPC | Broadwater, Cascade, Chouteau, Deer Lodge, Fergus, Golden Valley and 10 more | 85 min |
| Jul 8, 12:54 PM MDT | Mesoscale Discussion | SPC | Daniels, McCone, Phillips, Richland, Roosevelt, Sheridan and 1 more | 66 min |
| Jul 8, 1:04 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Broadwater, Carbon, Fergus, Gallatin, Golden Valley and 10 more | 6 hr |
| Jul 8, 1:23 PM MDT | Severe Thunderstorm Watch | SPC | Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more | 8 hr |
| Jul 8, 1:56 PM MDT | Mesoscale Discussion | SPC | Flathead, Glacier, Lake, Lewis and Clark, Lincoln, Mineral and 6 more | 94 min |
| Jul 8, 3:42 PM MDT | Mesoscale Discussion | SPC | Carter, Custer, Fallon, Powder River, Rosebud, Treasure | 2 hr |
| Jul 8, 4:01 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Fallon, Powder River, Rosebud, Treasure | 8 hr |
| Jul 8, 5:22 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Billings, Bowman, Burke, Divide, Dunn and 15 more | 6 hr |
| Jul 7, 8:14 PM MDT | Mesoscale Discussion | SPC | Butte, Clay, Custer, Fall River, Harding, Lawrence and 4 more | 2 hr |
| Jul 8, 1:51 PM MDT | Mesoscale Discussion | SPC | Bennett, Brule, Buffalo, Charles Mix, Custer, Fall River and 11 more | 54 min |
| Jul 8, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | Aurora, Bennett, Brule, Buffalo, Charles Mix, Douglas and 8 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2013Mesoscale Discussions in North Dakota, 2013Mesoscale Discussions in South Dakota, 2013Every mesoscale discussion in 2013
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.