Alert archive / Montana / Mesoscale Discussions in 2007
Mesoscale Discussion 1171
The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2007, 10:23 PM MDT for 13 counties in Montana. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- Jun 16, 2007, 10:23 PM MDT (04:23 UTC)
- Expired
- Jun 17, 2007, 12:00 AM MDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Roosevelt County, MT, Rosebud County, MT, Treasure County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 116 km from the middle of the area, began a volume at 04:23 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 00:00Z, 4.4 hours before the alert went out and 117 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
- 205 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1742 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 388 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.7
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 16, 6:02 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more | 88 min |
| Jun 16, 6:59 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 9 more | 91 min |
| Jun 16, 8:06 PM MDT | Mesoscale Discussion | SPC | Richland, Wibaux | 54 min |
| Jun 17, 12:32 AM MDT | Mesoscale Discussion | SPC | Fergus, Garfield, McCone, Petroleum | 28 min |
| Jun 17, 12:53 AM MDT | Severe Thunderstorm Watch | SPC | Custer, Dawson, Fergus, Garfield, Golden Valley, Judith Basin and 9 more | 4 hr |
| Jun 17, 4:02 AM MDT | Mesoscale Discussion | SPC | Custer, Dawson, Fallon, Powder River, Prairie, Richland and 2 more | 58 min |
| Jun 17, 4:40 AM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Custer, Dawson, Fallon, Prairie, Richland and 3 more | 3 hr |
Nearby
Mesoscale Discussions in Montana, 2007Every mesoscale discussion in 2007
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.