Alert archive / Montana / Mesoscale Discussions in 2013
Mesoscale Discussion 1345
The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2013, 12:54 PM MDT for 7 counties in Montana. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Jul 8, 2013, 12:54 PM MDT (18:54 UTC)
- Expired
- Jul 8, 2013, 2:00 PM MDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
Counties Daniels County, MT, McCone County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 33 km from the middle of the area, began a volume at 18:56 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, 6.9 hours before the alert went out and 31 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, 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, 4:58 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carbon, Carter, Custer, Daniels and 28 more | 2 hr |
Nearby
Mesoscale Discussions in Montana, 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.