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 Avalanche Center 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

Download Zone Shape

Download Zone Shape

Download Zone Shape

Download Zone Shape

Bridgeport Avalanche Center
Avalanche Report

Report not available. See BAC for more information.

Issued at: Sunday, April 21, 2024 7:00AM
Issued by: BAC

Eastside Region
Avalanche Report

Report not available. See ESAC for more information.

Issued at: Monday, April 15, 2024 7:00AM
Issued by: ESAC

Mount Shasta
Avalanche Report

Report not available. See MSAC for more information.

Issued at: Sunday, April 14, 2024 6:48AM
Issued by: MSAC

Central Sierra Nevada
Avalanche Report

Report not available. See SAC for more information.

Issued at: Monday, April 22, 2024 7:00AM
Issued by: SAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-22 06:20AM Shade	75 by 1 Copy to clipboard
2024-04-22 07:50AM Shade	88 by 18 Copy to clipboard
2024-04-22 09:20AM Shade	103 by 36 Copy to clipboard
2024-04-22 10:50AM Shade	124 by 52 Copy to clipboard
2024-04-22 12:20PM Shade	160 by 63 Copy to clipboard
2024-04-22 01:50PM Shade	209 by 62 Copy to clipboard
2024-04-22 03:20PM Shade	241 by 49 Copy to clipboard
2024-04-22 04:50PM Shade	260 by 32 Copy to clipboard
2024-04-22 06:20PM Shade	275 by 15 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-16 06:30AM Shade	78 by 1 Copy to clipboard
2024-04-16 08:00AM Shade	91 by 19 Copy to clipboard
2024-04-16 09:30AM Shade	107 by 37 Copy to clipboard
2024-04-16 11:00AM Shade	129 by 53 Copy to clipboard
2024-04-16 12:30PM Shade	167 by 62 Copy to clipboard
2024-04-16 02:00PM Shade	213 by 59 Copy to clipboard
2024-04-16 03:30PM Shade	242 by 46 Copy to clipboard
2024-04-16 05:00PM Shade	261 by 29 Copy to clipboard
2024-04-16 06:30PM Shade	275 by 11 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-15 06:40AM Shade	78 by 1 Copy to clipboard
2024-04-15 08:10AM Shade	92 by 18 Copy to clipboard
2024-04-15 09:40AM Shade	109 by 35 Copy to clipboard
2024-04-15 11:10AM Shade	132 by 49 Copy to clipboard
2024-04-15 12:40PM Shade	166 by 58 Copy to clipboard
2024-04-15 02:10PM Shade	208 by 56 Copy to clipboard
2024-04-15 03:40PM Shade	238 by 44 Copy to clipboard
2024-04-15 05:10PM Shade	258 by 29 Copy to clipboard
2024-04-15 06:40PM Shade	273 by 12 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-23 06:20AM Shade	74 by 1 Copy to clipboard
2024-04-23 07:50AM Shade	88 by 18 Copy to clipboard
2024-04-23 09:20AM Shade	103 by 35 Copy to clipboard
2024-04-23 10:50AM Shade	124 by 51 Copy to clipboard
2024-04-23 12:20PM Shade	159 by 62 Copy to clipboard
2024-04-23 01:50PM Shade	207 by 61 Copy to clipboard
2024-04-23 03:20PM Shade	240 by 49 Copy to clipboard
2024-04-23 04:50PM Shade	259 by 33 Copy to clipboard
2024-04-23 06:20PM Shade	274 by 16 Copy to clipboard

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