California Avalanche Map

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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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Bridgeport Winter Recreation Area

Pre-populated CalTopo Map

Eastside Region

Pre-populated CalTopo Map

Mount Shasta

Pre-populated CalTopo Map

Central Sierra Nevada

Pre-populated CalTopo Map

Avalanche Report

2023-03-20 Avalanche Danger

• Low danger (above 8701')
• Low danger (6201' to 8700')
• Low danger (below 6200')

a0-0e8701-20310f 50b848
a0-0e6201-8700f 50b848
a0-0e0-6200f 50b848

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2023-03-19 Wet Loose

• SE to SW aspects (above 8701')
• SE to SW aspects (6201' to 8700')
• SE to SW aspects (below 6200')

a113-248e8701-20310f A200FF
a113-248e6201-8700f A200FF
a113-248e0-6200f A200FF

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Issued at: Saturday, March 18, 2023 7:13AM
Issued by: BAC

2023-03-20 Avalanche Danger

• Considerable danger (above 10001')
• Considerable danger (7801' to 10000')
• Moderate danger (below 7800')

a0-0e10001-20310f f7941e
a0-0e7801-10000f f7941e
a0-0e0-7800f fff200

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2023-03-20 Wind Slab

• W to SE aspects (above 10001')
• W to SE aspects (7801' to 10000')

a248-158e10001-20310f A200FF
a248-158e7801-10000f A200FF

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2023-03-20 Deep Persistent Slab

• W to SE aspects (above 10001')
• W to SE aspects (7801' to 10000')
• W to SE aspects (below 7800')

a248-158e10001-20310f 0000FF
a248-158e7801-10000f 0000FF
a248-158e0-7800f 0000FF

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Issued at: Sunday, March 19, 2023 7:00AM
Issued by: ESAC

2023-03-20 Avalanche Danger

• Considerable danger (above 8701')
• Considerable danger (6201' to 8700')
• Moderate danger (below 6200')

a0-0e8701-20310f f7941e
a0-0e6201-8700f f7941e
a0-0e0-6200f fff200

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2023-03-20 Storm Slab

• All aspects (6201' to 8700')
• All aspects (below 6200')

a23-23e6201-8700f A200FF
a23-23e0-6200f A200FF

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2023-03-20 Wind Slab

• W to SE aspects (above 8701')
• W to SE aspects (6201' to 8700')
• W to SE aspects (below 6200')

a248-158e8701-20310f 0000FF
a248-158e6201-8700f 0000FF
a248-158e0-6200f 0000FF

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Issued at: Sunday, March 19, 2023 6:21AM
Issued by: MSAC

2023-03-20 Avalanche Danger

• Considerable danger (above 8701')
• Considerable danger (6201' to 8700')
• Considerable danger (below 6200')

a0-0e8701-20310f f7941e
a0-0e6201-8700f f7941e
a0-0e0-6200f f7941e

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2023-03-20 Wind Slab

• NW to SE aspects (above 8701')
• NW to SE aspects (6201' to 8700')

a293-158e8701-20310f A200FF
a293-158e6201-8700f A200FF

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2023-03-20 Storm Slab

• All aspects (6201' to 8700')
• All aspects (below 6200')

a23-23e6201-8700f 0000FF
a23-23e0-6200f 0000FF

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2023-03-20 Wet Loose

• All aspects (6201' to 8700')
• All aspects (below 6200')

a158-158e6201-8700f 009AFF
a158-158e0-6200f 009AFF

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Issued at: Sunday, March 19, 2023 7:00AM
Issued by: SAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-03-19 07:20AM Shade	93 by 2 Copy to clipboard
2023-03-19 08:50AM Shade	107 by 20 Copy to clipboard
2023-03-19 10:20AM Shade	125 by 36 Copy to clipboard
2023-03-19 11:50AM Shade	151 by 47 Copy to clipboard
2023-03-19 01:20PM Shade	186 by 51 Copy to clipboard
2023-03-19 02:50PM Shade	218 by 45 Copy to clipboard
2023-03-19 04:20PM Shade	241 by 31 Copy to clipboard
2023-03-19 05:50PM Shade	258 by 15 Copy to clipboard

Time of day	Lighting (Az/Z)
2023-03-20 07:10AM Shade	91 by 1 Copy to clipboard
2023-03-20 08:40AM Shade	105 by 19 Copy to clipboard
2023-03-20 10:10AM Shade	123 by 35 Copy to clipboard
2023-03-20 11:40AM Shade	148 by 48 Copy to clipboard
2023-03-20 01:10PM Shade	183 by 52 Copy to clipboard
2023-03-20 02:40PM Shade	217 by 46 Copy to clipboard
2023-03-20 04:10PM Shade	240 by 33 Copy to clipboard
2023-03-20 05:40PM Shade	257 by 16 Copy to clipboard

Time of day	Lighting (Az/Z)
2023-03-20 07:20AM Shade	91 by 1 Copy to clipboard
2023-03-20 08:50AM Shade	106 by 17 Copy to clipboard
2023-03-20 10:20AM Shade	124 by 33 Copy to clipboard
2023-03-20 11:50AM Shade	149 by 44 Copy to clipboard
2023-03-20 01:20PM Shade	181 by 49 Copy to clipboard
2023-03-20 02:50PM Shade	213 by 44 Copy to clipboard
2023-03-20 04:20PM Shade	237 by 32 Copy to clipboard
2023-03-20 05:50PM Shade	255 by 16 Copy to clipboard

Time of day	Lighting (Az/Z)
2023-03-20 07:20AM Shade	92 by 2 Copy to clipboard
2023-03-20 08:50AM Shade	107 by 19 Copy to clipboard
2023-03-20 10:20AM Shade	125 by 35 Copy to clipboard
2023-03-20 11:50AM Shade	151 by 47 Copy to clipboard
2023-03-20 01:20PM Shade	185 by 51 Copy to clipboard
2023-03-20 02:50PM Shade	217 by 44 Copy to clipboard
2023-03-20 04:20PM Shade	240 by 31 Copy to clipboard
2023-03-20 05:50PM Shade	258 by 15 Copy to clipboard

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