Colorado 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: CAIC zone CAIC zone CAIC zone CAIC zone

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Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Download Zone Shape

Download Zone Shape

Download Zone Shape

Download Zone Shape

CAIC zone
Avalanche Report

2024-04-28 Avalanche Danger

• Moderate danger (above 11501')
• Moderate danger (9501' to 11500')
• Low danger (below 9500')

a0-0e11501-20310f fff200
a0-0e9501-11500f fff200
a0-0e0-9500f 50b848

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2024-04-28 Storm Slab

• All aspects (above 11501')

a68-68e11501-20310f A200FF

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2024-04-28 Wet Loose

• E to W aspects (above 11501')
• All aspects (9501' to 11500')

a68-293e11501-20310f 0000FF
a203-203e9501-11500f 0000FF

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Issued at: Saturday, April 27, 2024 4:30PM
Issued by: CAIC

CAIC zone
Avalanche Report

2024-04-28 Avalanche Danger

• Moderate danger (above 11501')
• Moderate danger (9501' to 11500')
• Moderate danger (below 9500')

a0-0e11501-20310f fff200
a0-0e9501-11500f fff200
a0-0e0-9500f fff200

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2024-04-28 Storm Slab

• All aspects (above 11501')
• All aspects (9501' to 11500')
• NW to NE aspects (below 9500')

a23-23e11501-20310f A200FF
a293-293e9501-11500f A200FF
a293-68e0-9500f A200FF

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2024-04-28 Wet Loose

• E to W aspects (above 11501')
• All aspects (9501' to 11500')
• All aspects (below 9500')

a68-293e11501-20310f 0000FF
a203-203e9501-11500f 0000FF
a203-203e0-9500f 0000FF

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Issued at: Saturday, April 27, 2024 4:30PM
Issued by: CAIC

CAIC zone
Avalanche Report

2024-04-28 Avalanche Danger

• Moderate danger (above 11501')
• Moderate danger (9501' to 11500')
• Low danger (below 9500')

a0-0e11501-20310f fff200
a0-0e9501-11500f fff200
a0-0e0-9500f 50b848

Copy to clipboard

2024-04-28 Storm Slab

• All aspects (above 11501')

a23-23e11501-20310f A200FF

Copy to clipboard

2024-04-28 Wet Loose

• E to W aspects (above 11501')
• All aspects (9501' to 11500')

a68-293e11501-20310f 0000FF
a248-248e9501-11500f 0000FF

Copy to clipboard

Issued at: Saturday, April 27, 2024 4:30PM
Issued by: CAIC

CAIC zone
Avalanche Report

2024-04-28 Avalanche Danger

• Moderate danger (above 11501')
• Moderate danger (9501' to 11500')
• Low danger (below 9500')

a0-0e11501-20310f fff200
a0-0e9501-11500f fff200
a0-0e0-9500f 50b848

Copy to clipboard

2024-04-28 Wet Loose

• E to W aspects (above 11501')
• E to W aspects (9501' to 11500')

a68-293e11501-20310f A200FF
a68-293e9501-11500f A200FF

Copy to clipboard

2024-04-28 Storm Slab

• NW to NE aspects (above 11501')

a293-68e11501-20310f 0000FF

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Issued at: Saturday, April 27, 2024 4:30PM
Issued by: CAIC

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-28 06:20AM Shade	72 by 1 Copy to clipboard
2024-04-28 07:50AM Shade	86 by 17 Copy to clipboard
2024-04-28 09:20AM Shade	100 by 35 Copy to clipboard
2024-04-28 10:50AM Shade	121 by 51 Copy to clipboard
2024-04-28 12:20PM Shade	155 by 63 Copy to clipboard
2024-04-28 01:50PM Shade	203 by 63 Copy to clipboard
2024-04-28 03:20PM Shade	238 by 51 Copy to clipboard
2024-04-28 04:50PM Shade	259 by 35 Copy to clipboard
2024-04-28 06:20PM Shade	274 by 18 Copy to clipboard
2024-04-28 07:50PM Shade	288 by 1 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-28 06:20AM Shade	73 by 2 Copy to clipboard
2024-04-28 07:50AM Shade	87 by 19 Copy to clipboard
2024-04-28 09:20AM Shade	102 by 36 Copy to clipboard
2024-04-28 10:50AM Shade	123 by 52 Copy to clipboard
2024-04-28 12:20PM Shade	158 by 63 Copy to clipboard
2024-04-28 01:50PM Shade	206 by 62 Copy to clipboard
2024-04-28 03:20PM Shade	240 by 50 Copy to clipboard
2024-04-28 04:50PM Shade	260 by 34 Copy to clipboard
2024-04-28 06:20PM Shade	275 by 17 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-28 06:20AM Shade	72 by 1 Copy to clipboard
2024-04-28 07:50AM Shade	85 by 18 Copy to clipboard
2024-04-28 09:20AM Shade	100 by 35 Copy to clipboard
2024-04-28 10:50AM Shade	120 by 51 Copy to clipboard
2024-04-28 12:20PM Shade	155 by 63 Copy to clipboard
2024-04-28 01:50PM Shade	205 by 64 Copy to clipboard
2024-04-28 03:20PM Shade	240 by 52 Copy to clipboard
2024-04-28 04:50PM Shade	260 by 35 Copy to clipboard
2024-04-28 06:20PM Shade	275 by 18 Copy to clipboard
2024-04-28 07:50PM Shade	288 by 1 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-28 06:30AM Shade	73 by 2 Copy to clipboard
2024-04-28 08:00AM Shade	86 by 19 Copy to clipboard
2024-04-28 09:30AM Shade	101 by 37 Copy to clipboard
2024-04-28 11:00AM Shade	121 by 54 Copy to clipboard
2024-04-28 12:30PM Shade	159 by 65 Copy to clipboard
2024-04-28 02:00PM Shade	211 by 64 Copy to clipboard
2024-04-28 03:30PM Shade	244 by 51 Copy to clipboard
2024-04-28 05:00PM Shade	262 by 34 Copy to clipboard
2024-04-28 06:30PM Shade	276 by 16 Copy to clipboard

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