Alert archive / Montana / Mesoscale Discussions in 2011
Mesoscale Discussion 1603
The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2011, 12:36 PM MDT for Custer County, Lemhi County, Idaho; 24 counties in Montana. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2011, 12:36 PM MDT (18:36 UTC)
- Expired
- Jul 13, 2011, 2:30 PM MDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 26 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, Gallatin County, MT, Glacier 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, 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 Great Falls radar (KTFX), 116 km from the middle of the area, began a volume at 18:39 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 162 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
- 6 J/kg
- Mixed-layer CIN
- -325 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 16 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 13, 1:45 PM MDT | Severe Thunderstorm Watch | SPC | Lemhi | 7 hr |
| Jul 13, 5:13 PM MDT | Mesoscale Discussion | SPC | Lemhi | 62 min |
| Jul 12, 7:17 PM MDT | Mesoscale Discussion | SPC | Blaine, Cascade, Chouteau, Fergus, Granite, Hill and 8 more | 58 min |
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.