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

Select A Zone:

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
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

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
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
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
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

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
2023-04-02 Wind Slab
  • All aspects (above 8701')
  • All aspects (6201' to 8700')
a113-113e8701-20310f A200FF
a113-113e6201-8700f A200FF

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
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
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

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
2023-04-02 08:20AM Shade 98 by 18
2023-04-02 09:50AM Shade 115 by 35
2023-04-02 11:20AM Shade 139 by 49
2023-04-02 12:50PM Shade 175 by 57
2023-04-02 02:20PM Shade 213 by 52
2023-04-02 03:50PM Shade 240 by 39
2023-04-02 05:20PM Shade 258 by 23
2023-04-02 06:50PM Shade 272 by 6


Sunlight Angles

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


Sunlight Angles

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


Sunlight Angles

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

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