Alert archive / Montana / Mesoscale Discussions in 2011
Mesoscale Discussion 1441
The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2011, 11:35 AM PDT for 4 counties in Idaho; 27 counties in Montana. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jun 29, 2011, 11:35 AM PDT (18:35 UTC)
- Expired
- Jun 29, 2011, 1:30 PM PDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 31 counties
Clearwater County, ID, Idaho County, ID, Lemhi County, ID, Valley County, ID, Beaverhead County, MT, Blaine County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Deer Lodge County, MT, Fergus County, MT, Gallatin County, MT, Granite County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lake County, MT, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Mineral County, MT, Missoula County, MT, Phillips County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Teton County, MT, Toole County, MT, Wheatland County, MT
The radar
The Great Falls radar (KTFX), 70 km from the middle of the area, began a volume at 18:38 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
Great_falls, MT (KTFX), launched 12:00Z, 6.6 hours before the alert went out and 119 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
- 23 J/kg
- Mixed-layer CIN
- -499 J/kg
- Mixed-layer LCL
- 2376 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 106 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 29, 12:41 PM PDT | Mesoscale Discussion | SPC | Bear Lake, Caribou, Franklin | 2 hr |
| Jun 29, 2:46 PM PDT | Severe Thunderstorm Watch | SPC | Blaine, Cascade, Chouteau, Fergus, Garfield, Golden Valley and 9 more | 5 hr |
Nearby
Mesoscale Discussions in Montana, 2011Mesoscale Discussions in Idaho, 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.