California 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: Bridgeport Winter Recreation Area Eastside Region Mount Shasta Central Sierra Nevada

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Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Bridgeport Winter Recreation Area
Avalanche Report

Report not available. See BAC for more information.

Issued at: Saturday, April 22, 2023 7:00AM
Issued by: BAC

Eastside Region
Avalanche Report

Report not available. See ESAC for more information.

Issued at: Sunday, April 30, 2023 7:00AM
Issued by: ESAC

Mount Shasta
Avalanche Report

Report not available. See MSAC for more information.

Issued at: Sunday, April 16, 2023 5:56AM
Issued by: MSAC

Central Sierra Nevada
Avalanche Report

Report not available. See SAC for more information.

Issued at: Monday, May 01, 2023 7:00AM
Issued by: SAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-23 06:20AM Shade	74 by 1 Copy to clipboard
2023-04-23 07:50AM Shade	88 by 18 Copy to clipboard
2023-04-23 09:20AM Shade	103 by 36 Copy to clipboard
2023-04-23 10:50AM Shade	124 by 52 Copy to clipboard
2023-04-23 12:20PM Shade	160 by 63 Copy to clipboard
2023-04-23 01:50PM Shade	208 by 62 Copy to clipboard
2023-04-23 03:20PM Shade	241 by 49 Copy to clipboard
2023-04-23 04:50PM Shade	260 by 33 Copy to clipboard
2023-04-23 06:20PM Shade	275 by 15 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-05-01 06:10AM Shade	72 by 1 Copy to clipboard
2023-05-01 07:40AM Shade	85 by 18 Copy to clipboard
2023-05-01 09:10AM Shade	99 by 36 Copy to clipboard
2023-05-01 10:40AM Shade	118 by 53 Copy to clipboard
2023-05-01 12:10PM Shade	154 by 66 Copy to clipboard
2023-05-01 01:40PM Shade	208 by 65 Copy to clipboard
2023-05-01 03:10PM Shade	243 by 52 Copy to clipboard
2023-05-01 04:40PM Shade	262 by 35 Copy to clipboard
2023-05-01 06:10PM Shade	276 by 18 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-17 06:40AM Shade	77 by 2 Copy to clipboard
2023-04-17 08:10AM Shade	92 by 18 Copy to clipboard
2023-04-17 09:40AM Shade	109 by 35 Copy to clipboard
2023-04-17 11:10AM Shade	131 by 50 Copy to clipboard
2023-04-17 12:40PM Shade	166 by 59 Copy to clipboard
2023-04-17 02:10PM Shade	208 by 56 Copy to clipboard
2023-04-17 03:40PM Shade	238 by 45 Copy to clipboard
2023-04-17 05:10PM Shade	258 by 29 Copy to clipboard
2023-04-17 06:40PM Shade	273 by 12 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-05-02 06:10AM Shade	71 by 1 Copy to clipboard
2023-05-02 07:40AM Shade	84 by 18 Copy to clipboard
2023-05-02 09:10AM Shade	99 by 35 Copy to clipboard
2023-05-02 10:40AM Shade	118 by 52 Copy to clipboard
2023-05-02 12:10PM Shade	153 by 64 Copy to clipboard
2023-05-02 01:40PM Shade	205 by 65 Copy to clipboard
2023-05-02 03:10PM Shade	240 by 53 Copy to clipboard
2023-05-02 04:40PM Shade	260 by 36 Copy to clipboard
2023-05-02 06:10PM Shade	275 by 19 Copy to clipboard
2023-05-02 07:40PM Shade	289 by 2 Copy to clipboard

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