Alert archive / Montana / Mesoscale Discussions in 2011
Mesoscale Discussion 1371
The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2011, 4:50 PM MDT for 24 counties in Montana. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2011, 4:50 PM MDT (22:50 UTC)
- Expired
- Jun 23, 2011, 6:15 PM MDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 24 counties
Big Horn County, MT, Blaine County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Pondera County, MT, Powell County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Great Falls radar (KTFX), 101 km from the middle of the area, began a volume at 22:53 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
Great_falls, MT (KTFX), launched 12:00Z, 10.8 hours before the alert went out and 86 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
- 4 J/kg
- Mixed-layer CIN
- -256 J/kg
- Mixed-layer LCL
- 2315 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- -13 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 23, 12:16 PM MDT | Mesoscale Discussion | SPC | Deer Lodge, Flathead, Glacier, Granite, Lake, Lewis and Clark and 6 more | 59 min |
| Jun 23, 12:55 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Broadwater, Cascade, Chouteau, Deer Lodge, Fergus and 16 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2011Every mesoscale discussion in 2011
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.