California Avalanche Maps

---

"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.

---

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.

---

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

Copy to clipboard

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Bridgeport Winter Recreation Area
Avalanche Report

2023-04-02 Avalanche Danger

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

a0-0e8701-20310f fff200
a0-0e6201-8700f fff200
a0-0e0-6200f 50b848

Copy to clipboard

2023-04-02 Wind Slab

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

a339-158e8701-20310f A200FF
a339-158e6201-8700f A200FF

Copy to clipboard

Issued at: Saturday, April 01, 2023 7:00AM
Issued by: BAC

Eastside Region
Avalanche Report

2023-04-02 Avalanche Danger

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

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

Copy to clipboard

2023-04-02 Wind Slab

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

a293-158e10001-20310f A200FF
a293-158e7801-10000f A200FF

Copy to clipboard

2023-04-02 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

Copy to clipboard

2023-04-02 Wet Loose

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

a68-293e10001-20310f 009AFF
a68-293e7801-10000f 009AFF
a68-293e0-7800f 009AFF

Copy to clipboard

Issued at: Saturday, April 01, 2023 7:00AM
Issued by: ESAC

Mount Shasta
Avalanche Report

2023-04-02 Avalanche Danger

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

a0-0e8701-20310f fff200
a0-0e6201-8700f fff200
a0-0e0-6200f 50b848

Copy to clipboard

2023-04-02 Wind Slab

• All aspects (above 8701')
• All aspects (6201' to 8700')

a113-113e8701-20310f A200FF
a113-113e6201-8700f A200FF

Copy to clipboard

Issued at: Saturday, April 01, 2023 5:46AM
Issued by: MSAC

Central Sierra Nevada
Avalanche Report

2023-04-02 Avalanche Danger

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

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

Copy to clipboard

2023-04-02 Wind Slab

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

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

Copy to clipboard

2023-04-02 Wet Loose

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

a68-293e8701-20310f 0000FF
a68-293e6201-8700f 0000FF
a68-293e0-6200f 0000FF

Copy to clipboard

Issued at: Saturday, April 01, 2023 6:44AM
Issued by: SAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 06:50AM Shade	84 by 1 Copy to clipboard
2023-04-02 08:20AM Shade	98 by 18 Copy to clipboard
2023-04-02 09:50AM Shade	115 by 35 Copy to clipboard
2023-04-02 11:20AM Shade	139 by 49 Copy to clipboard
2023-04-02 12:50PM Shade	175 by 57 Copy to clipboard
2023-04-02 02:20PM Shade	213 by 52 Copy to clipboard
2023-04-02 03:50PM Shade	240 by 39 Copy to clipboard
2023-04-02 05:20PM Shade	258 by 23 Copy to clipboard
2023-04-02 06:50PM Shade	272 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 06:50AM Shade	85 by 1 Copy to clipboard
2023-04-02 08:20AM Shade	99 by 19 Copy to clipboard
2023-04-02 09:50AM Shade	115 by 36 Copy to clipboard
2023-04-02 11:20AM Shade	139 by 50 Copy to clipboard
2023-04-02 12:50PM Shade	176 by 57 Copy to clipboard
2023-04-02 02:20PM Shade	215 by 53 Copy to clipboard
2023-04-02 03:50PM Shade	241 by 39 Copy to clipboard
2023-04-02 05:20PM Shade	259 by 23 Copy to clipboard
2023-04-02 06:50PM Shade	273 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:00AM Shade	84 by 1 Copy to clipboard
2023-04-02 08:30AM Shade	99 by 18 Copy to clipboard
2023-04-02 10:00AM Shade	117 by 34 Copy to clipboard
2023-04-02 11:30AM Shade	141 by 47 Copy to clipboard
2023-04-02 01:00PM Shade	175 by 54 Copy to clipboard
2023-04-02 02:30PM Shade	211 by 50 Copy to clipboard
2023-04-02 04:00PM Shade	237 by 38 Copy to clipboard
2023-04-02 05:30PM Shade	256 by 23 Copy to clipboard
2023-04-02 07:00PM Shade	272 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-04-02 07:00AM Shade	86 by 2 Copy to clipboard
2023-04-02 08:30AM Shade	100 by 20 Copy to clipboard
2023-04-02 10:00AM Shade	117 by 36 Copy to clipboard
2023-04-02 11:30AM Shade	142 by 50 Copy to clipboard
2023-04-02 01:00PM Shade	178 by 56 Copy to clipboard
2023-04-02 02:30PM Shade	215 by 51 Copy to clipboard
2023-04-02 04:00PM Shade	241 by 38 Copy to clipboard
2023-04-02 05:30PM Shade	259 by 21 Copy to clipboard
2023-04-02 07:00PM Shade	273 by 4 Copy to clipboard

---

Change Regions: Alaska California Wyoming Oregon Montana Idaho Arizona New Hampshire Washington New Mexico Utah

If you enjoyed this or found it helpful, please consider buying an espresso to keep the flow going.

Show Known Issues