Alert archive / Montana / Mesoscale Discussions in 2004
Mesoscale Discussion 1883
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2004, 1:03 PM PDT for Shoshone County, Idaho; 28 counties in Montana. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2004, 1:03 PM PDT (20:03 UTC)
- Expired
- Aug 4, 2004, 3:00 PM PDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 29 counties
Shoshone County, ID, Blaine County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Deer Lodge County, MT, Fergus County, MT, Flathead 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, Lincoln County, MT, Meagher County, MT, Mineral County, MT, Missoula County, MT, Petroleum County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT, Teton County, MT, Toole County, MT, Wheatland County, MT
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.1 hours before the alert went out and 148 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
- 56 J/kg
- Mixed-layer CIN
- -225 J/kg
- Mixed-layer LCL
- 1536 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 140 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 4, 4:43 PM PDT | Mesoscale Discussion | SPC | Benewah, Kootenai, Latah, Lewis, Nez Perce, Shoshone | 62 min |
| Aug 4, 2:22 PM PDT | Mesoscale Discussion | SPC | Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more | 2 hr |
Nearby
Mesoscale Discussions in Montana, 2004Mesoscale Discussions in Idaho, 2004Every mesoscale discussion in 2004
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.