Alert archive / Montana / Mesoscale Discussions in 2008
Mesoscale Discussion 2121
The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2008, 12:43 PM MDT for 24 counties in Montana. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2008, 12:43 PM MDT (18:43 UTC)
- Expired
- Aug 19, 2008, 2:15 PM MDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 24 counties
Beaverhead 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, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Missoula County, MT, Park County, MT, Pondera County, MT, Powell County, MT, Silver Bow County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Wheatland County, MT
The radar
The Great Falls radar (KTFX), 92 km from the middle of the area, began a volume at 18:42 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
Spokane, WA (KOTX), launched 12:00Z, 6.7 hours before the alert went out and 367 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
- 167 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 768 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 36 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 |
|---|---|---|---|---|
| Aug 19, 1:31 PM MDT | Severe Thunderstorm Watch | SPC | Broadwater, Cascade, Chouteau, Deer Lodge, Glacier, Granite and 10 more | 5 hr |
| Aug 19, 4:19 PM MDT | Mesoscale Discussion | SPC | Blaine, Chouteau, Fergus, Hill, Judith Basin, Liberty and 1 more | 56 min |
Nearby
Mesoscale Discussions in Montana, 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.