Alert archive / Montana / Mesoscale Discussions in 2012
Mesoscale Discussion 1342
The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 2:40 PM MDT for 16 counties in Montana; 7 counties in North Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2012, 2:40 PM MDT (20:40 UTC)
- Expired
- Jul 1, 2012, 4:45 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 23 counties
Carter County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Billings County, ND, Bowman County, ND, Divide County, ND, Golden Valley County, ND, McKenzie County, ND, Slope County, ND, Williams County, ND
The radar
The Glasgow radar (KGGW), 144 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 144 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
- 2044 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Jun 30, 8:33 PM MDT | Mesoscale Discussion | SPC | Flathead, Lake, Lincoln, Mineral, Missoula, Sanders | 2 hr |
| Jul 1, 4:04 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carter, Custer, Daniels, Dawson, Fallon and 13 more | 9 hr |
| Jul 1, 4:34 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Blaine, Broadwater, Carbon, Cascade, Chouteau and 19 more | 86 min |
| Jul 1, 5:04 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Blaine, Broadwater, Carbon, Cascade, Chouteau and 18 more | 6 hr |
| Jun 30, 6:19 PM MDT | Mesoscale Discussion | SPC | Emmons, Kidder, Logan, Sioux, Stutsman | 86 min |
Nearby
Mesoscale Discussions in Montana, 2012Mesoscale Discussions in North Dakota, 2012Every mesoscale discussion in 2012
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.