Washington Avalanche Danger Report Interactive Map

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"Where's the danger?" Here are autogenerated DEM Shading rules for each advisory zone that allow for quickly adding avalanche danger and problem layers to CalTopo maps.

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: East Slopes Central East Slopes North East Slopes South Olympics Snoqualmie Pass Stevens Pass West Slopes Central West Slopes North West Slopes South

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• Considerable danger (above 6000')
• Considerable danger (5000' to 5999')
• Moderate danger (below 4999')

2025-02-22 Wind Slab

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• All aspects (above 6000')
• All aspects (5000' to 5999')

2025-02-22 Wet Slab

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• All aspects (above 6000')
• All aspects (5000' to 5999')
• All aspects (below 4999')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• High danger (above 6500')
• Considerable danger (5000' to 6499')
• Considerable danger (below 4999')

2025-02-22 Storm Slab

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• All aspects (above 6500')
• All aspects (5000' to 6499')

2025-02-22 Persistent Slab

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• W to E aspects (above 6500')
• W to E aspects (5000' to 6499')

2025-02-22 Wet Loose

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• All aspects (5000' to 6499')
• All aspects (below 4999')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• Moderate danger (above 6000')
• Moderate danger (5000' to 5999')
• Moderate danger (below 4999')

2025-02-22 Wind Slab

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• All aspects (above 6000')
• All aspects (5000' to 5999')

2025-02-22 Persistent Slab

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• W to E aspects (above 6000')
• W to E aspects (5000' to 5999')

2025-02-22 Wet Loose

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• All aspects (5000' to 5999')
• All aspects (below 4999')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• High danger (above 5500')
• High danger (4500' to 5499')
• High danger (below 4499')

2025-02-22 Wet Slab

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• All aspects (above 5500')
• All aspects (4500' to 5499')
• All aspects (below 4499')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• Considerable danger (above 5500')
• Considerable danger (4000' to 5499')
• Considerable danger (below 3999')

2025-02-22 Wet Slab

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• All aspects (above 5500')
• All aspects (4000' to 5499')
• All aspects (below 3999')

2025-02-22 Storm Slab

Copy to clipboard

• All aspects (above 5500')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

Copy to clipboard

• Considerable danger (above 6000')
• Considerable danger (5000' to 5999')
• Considerable danger (below 4999')

2025-02-22 Wet Slab

Copy to clipboard

• All aspects (above 6000')
• All aspects (5000' to 5999')
• All aspects (below 4999')

2025-02-22 Storm Slab

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• All aspects (above 6000')
• All aspects (5000' to 5999')

Issued at: Friday, February 21, 2025 6:04PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

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• High danger (above 5500')
• High danger (4500' to 5499')
• High danger (below 4499')

2025-02-22 Wet Slab

Copy to clipboard

• All aspects (above 5500')
• All aspects (4500' to 5499')
• All aspects (below 4499')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

Copy to clipboard

• High danger (above 5500')
• High danger (4500' to 5499')
• High danger (below 4499')

2025-02-22 Wet Slab

Copy to clipboard

• All aspects (above 5500')
• All aspects (4500' to 5499')
• All aspects (below 4499')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Avalanche Report

Pre-populated CalTopo Map

2025-02-22 Avalanche Danger

Copy to clipboard

• Considerable danger (above 6500')
• Considerable danger (5500' to 6499')
• Considerable danger (below 5499')

2025-02-22 Wet Slab

Copy to clipboard

• All aspects (above 6500')
• All aspects (5500' to 6499')
• All aspects (below 5499')

2025-02-22 Storm Slab

Copy to clipboard

• All aspects (above 6500')
• All aspects (5500' to 6499')

Issued at: Friday, February 21, 2025 6:00PM
Issued by: NWAC

Zone

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