Alert archive / Montana / Mesoscale Discussions in 2005
Mesoscale Discussion 1507
The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2005, 3:10 PM MDT for 27 counties in Montana. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2005, 3:10 PM MDT (21:10 UTC)
- Expired
- Jun 27, 2005, 5:15 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Glacier County, MT, Golden Valley County, MT, Jefferson County, MT, Judith Basin County, MT, Lake County, MT, Lewis and Clark County, MT, Liberty County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Pondera County, MT, Powder River County, MT, Powell County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Great Falls radar (KTFX), 106 km from the middle of the area, began a volume at 21:11 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, 9.2 hours before the alert went out and 67 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
- 7 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 714 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 30 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 26, 6:12 PM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, Powder River, Richland, Roosevelt and 2 more | 2 hr |
| Jun 27, 4:20 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Cascade, Fergus, Golden Valley, Judith Basin, Meagher and 10 more | 8 hr |
Nearby
Mesoscale Discussions in Montana, 2005Every mesoscale discussion in 2005
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.