Montana Avalanche Map Layers

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"What's the danger?" Here are autogenerated DEM Shading rules for each advisory zone that allow for quickly adding avalanche danger, problems, and sun angle layers to CalTopo maps. Reports sourced from avalanche.org.

Show Instructions

Digital Elevation Model (DEM) shading let's you create custom shading schemes based on elevation, slope, aspect and tree cover.

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Avalanche Report

Danger report updates are fetched at 7:33pm and 7:33am. The selected elevation bands are not meant to be exact, but represent a characteristic of the terrain which varies locally.

The highest band typically includes alpine areas beginning as the treeline transitions into open slopes extending to ridges and peaks.

The middle band is typically a narrow transition zone between dense forests and treeless alpine areas.

The lowest band typically extends from valley floors or snowline to near treeline.

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Usage

You'll find that Terrain Modeling in the left pane will show layers that can be turned on and edited. The right pane will show Custom Layers that can be toggled on or off.

Select A Zone: Flathead Range & Glacier NP Swan Range Whitefish Range Bridger Range Cooke City Island Park Lionhead Area Northern Gallatin Range Northern Madison Range Southern Gallatin Range Southern Madison Range East Cabinet Mountains Purcell Mountains Bitterroot Rattlesnake Seeley Lake

Avalanche Report

Pre-populated CalTopo Map

2024-12-22 Avalanche Danger

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• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

2024-12-22 Persistent Slab

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• W to SE aspects (above 6101')
• W to SE aspects (4401' to 6100')

2024-12-22 Wind Slab

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• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

Issued at: Saturday, December 21, 2024 7:01AM
Issued by: FAC

Avalanche Report

Pre-populated CalTopo Map

2024-12-22 Avalanche Danger

Copy to clipboard

• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

2024-12-22 Persistent Slab

Copy to clipboard

• W to SE aspects (above 6101')
• W to SE aspects (4401' to 6100')

2024-12-22 Wind Slab

Copy to clipboard

• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

Issued at: Saturday, December 21, 2024 7:01AM
Issued by: FAC

Avalanche Report

Pre-populated CalTopo Map

2024-12-22 Avalanche Danger

Copy to clipboard

• Moderate danger (above 6101')
• Moderate danger (4401' to 6100')
• Low danger (below 4400')

2024-12-22 Persistent Slab

Copy to clipboard

• W to SE aspects (above 6101')
• W to SE aspects (4401' to 6100')

2024-12-22 Wind Slab

Copy to clipboard

• NW to SE aspects (above 6101')
• NW to SE aspects (4401' to 6100')

Issued at: Saturday, December 21, 2024 7:01AM
Issued by: FAC

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See GNFAC for more information.

Avalanche Report

Report not available. See IPAC for more information.

Avalanche Report

Report not available. See IPAC for more information.

Avalanche Report

Report not available. See WCMAC for more information.

Avalanche Report

Report not available. See WCMAC for more information.

Avalanche Report

Report not available. See WCMAC for more information.

Zone

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