Alert archive / Montana / Mesoscale Discussions in 2008
Mesoscale Discussion 1680
The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2008, 1:45 PM MDT for Custer County, Lemhi County, Idaho; 21 counties in Montana. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2008, 1:45 PM MDT (19:45 UTC)
- Expired
- Jul 4, 2008, 2:45 PM MDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 23 counties
Custer County, ID, Lemhi County, ID, Beaverhead County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Deer Lodge County, MT, Flathead County, MT, Glacier County, MT, Granite County, MT, Jefferson County, MT, Lake County, MT, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Missoula County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Teton County, MT, Toole County, MT
The radar
The Missoula radar (KMSX), 118 km from the middle of the area, began a volume at 19:44 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, 7.8 hours before the alert went out and 248 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
- 32 J/kg
- Mixed-layer CIN
- -527 J/kg
- Mixed-layer LCL
- 2745 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 109 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 |
|---|---|---|---|---|
| Jul 4, 2:04 PM MDT | Severe Thunderstorm Watch | SPC | Lemhi | 8 hr |
| Jul 4, 5:45 PM MDT | Mesoscale Discussion | SPC | Lemhi | 60 min |
| Jul 4, 3:02 PM MDT | Mesoscale Discussion | SPC | Blaine, Carbon, Fergus, Golden Valley, Judith Basin, Musselshell and 7 more | 58 min |
| Jul 4, 3:05 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Fergus, Gallatin, Garfield, Golden Valley, Judith Basin and 10 more | 7 hr |
Nearby
Mesoscale Discussions in Montana, 2008Mesoscale Discussions in Idaho, 2008Every mesoscale discussion in 2008
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.