California Avalanche Map


"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

Pre-populated CalTopo Map

Eastside Region

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
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

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
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
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

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
2023-03-20 Storm Slab
  • All aspects (6201' to 8700')
  • All aspects (below 6200')
a23-23e6201-8700f A200FF
a23-23e0-6200f A200FF
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

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
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
2023-03-20 Storm Slab
  • All aspects (6201' to 8700')
  • All aspects (below 6200')
a23-23e6201-8700f 0000FF
a23-23e0-6200f 0000FF
2023-03-20 Wet Loose
  • All aspects (6201' to 8700')
  • All aspects (below 6200')
a158-158e6201-8700f 009AFF
a158-158e0-6200f 009AFF

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
2023-03-19 08:50AM Shade 107 by 20
2023-03-19 10:20AM Shade 125 by 36
2023-03-19 11:50AM Shade 151 by 47
2023-03-19 01:20PM Shade 186 by 51
2023-03-19 02:50PM Shade 218 by 45
2023-03-19 04:20PM Shade 241 by 31
2023-03-19 05:50PM Shade 258 by 15
Time of day Lighting (Az/Z)
2023-03-20 07:10AM Shade 91 by 1
2023-03-20 08:40AM Shade 105 by 19
2023-03-20 10:10AM Shade 123 by 35
2023-03-20 11:40AM Shade 148 by 48
2023-03-20 01:10PM Shade 183 by 52
2023-03-20 02:40PM Shade 217 by 46
2023-03-20 04:10PM Shade 240 by 33
2023-03-20 05:40PM Shade 257 by 16
Time of day Lighting (Az/Z)
2023-03-20 07:20AM Shade 91 by 1
2023-03-20 08:50AM Shade 106 by 17
2023-03-20 10:20AM Shade 124 by 33
2023-03-20 11:50AM Shade 149 by 44
2023-03-20 01:20PM Shade 181 by 49
2023-03-20 02:50PM Shade 213 by 44
2023-03-20 04:20PM Shade 237 by 32
2023-03-20 05:50PM Shade 255 by 16
Time of day Lighting (Az/Z)
2023-03-20 07:20AM Shade 92 by 2
2023-03-20 08:50AM Shade 107 by 19
2023-03-20 10:20AM Shade 125 by 35
2023-03-20 11:50AM Shade 151 by 47
2023-03-20 01:20PM Shade 185 by 51
2023-03-20 02:50PM Shade 217 by 44
2023-03-20 04:20PM Shade 240 by 31
2023-03-20 05:50PM Shade 258 by 15

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