Alaska 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

The selected elevation bands are not meant to be exact, but represent a characteristic of the terrain which varies locally.

The highest band, ATL (Above Tree Line), typically includes alpine areas beginning as the treeline transitions into open slopes extending to ridges and peaks.

The middle band, NTL (Near Tree Line), is typically a narrow transition zone between dense forests and treeless alpine areas.

The lowest band, BTL (Below Tree Line), typically extends from valley floors or snowline to near treeline.

Adjusting bands

The default elevation bands may not be accurate for the current zone, you can adjust the bands by dragging the sliders.

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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: Chugach State Park Seward and Lost Lake Summit Lake Turnagain Pass Juneau Cordova Eastern Alaska Range Chilkat Pass Lutak Transitional Hatcher Pass Continental Intermountain Maritime

Avalanche Report

Report not available. See CNFAIC for more information.

Avalanche Report

Report not available. See CNFAIC for more information.

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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• Moderate danger (above 2501')
• Low danger (1000' to 2500')
• No rating (below 999')

2024-12-30 Persistent Slab

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• All aspects (above 2501')

Issued at: Sunday, December 29, 2024 7:00AM
Issued by: CNFAIC

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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• Moderate danger (above 2501')
• Low danger (1000' to 2500')
• No rating (below 999')

2024-12-30 Persistent Slab

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• All aspects (above 2501')

2024-12-30 Glide Avalanches

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• All aspects (above 2501')
• All aspects (1000' to 2500')

Issued at: Sunday, December 29, 2024 7:00AM
Issued by: CNFAIC

Avalanche Report

Report not available. See CAAC for more information.

Avalanche Report

Report not available. See CAC for more information.

Avalanche Report

Report not available. See EARAC for more information.

Avalanche Report

Report not available. See HAC for more information.

Avalanche Report

Report not available. See HAC for more information.

Avalanche Report

Report not available. See HAC for more information.

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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

Issued at: Sunday, December 29, 2024 7:00AM
Issued by: HPAC

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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• Considerable danger (above 4001')
• Considerable danger (2000' to 4000')
• Moderate danger (below 1999')

2024-12-30 Persistent Slab

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• All aspects (above 4001')
• All aspects (2000' to 4000')
• All aspects (below 1999')

2024-12-30 Wind Slab

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• SE to NW aspects (above 4001')
• SE to NW aspects (2000' to 4000')

2024-12-30 Glide Avalanches

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• NW to NE aspects (2000' to 4000')

Issued at: Sunday, December 29, 2024 7:51AM
Issued by: VAC

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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• Considerable danger (above 4001')
• Considerable danger (2000' to 4000')
• Moderate danger (below 1999')

2024-12-30 Persistent Slab

Copy to clipboard

• All aspects (above 4001')
• All aspects (2000' to 4000')
• All aspects (below 1999')

2024-12-30 Wind Slab

Copy to clipboard

• SE to NW aspects (above 4001')
• SE to NW aspects (2000' to 4000')

2024-12-30 Glide Avalanches

Copy to clipboard

• NW to NE aspects (2000' to 4000')

Issued at: Sunday, December 29, 2024 7:51AM
Issued by: VAC

Avalanche Report

Pre-populated CalTopo Map

2024-12-30 Avalanche Danger

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• Considerable danger (above 3001')
• Considerable danger (1500' to 3000')
• Moderate danger (below 1499')

2024-12-30 Persistent Slab

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• All aspects (above 3001')
• All aspects (1500' to 3000')
• All aspects (below 1499')

2024-12-30 Wind Slab

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• SE to NW aspects (above 3001')
• SE to NW aspects (1500' to 3000')

Issued at: Sunday, December 29, 2024 7:53AM
Issued by: VAC

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