Alaska 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: Chugach State Park Seward and Lost Lake Summit Lake Turnagain Pass Juneau Cordova Eastern Alaska Range Chilkat Pass Lutak Transitional Hatcher Pass Continental Intermountain Maritime

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Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

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Chugach State Park
Avalanche Report

Report not available. See CNFAIC for more information.

Seward and Lost Lake
Avalanche Report

Report not available. See CNFAIC for more information.

Summit Lake
Avalanche Report

Report not available. See CNFAIC for more information.

Turnagain Pass
Avalanche Report

Report not available. See CNFAIC for more information.

Issued at: Thursday, April 25, 2024 7:00AM
Issued by: CNFAIC

Juneau
Avalanche Report

Report not available. See CAAC for more information.

Cordova
Avalanche Report

Report not available. See CAC for more information.

Eastern Alaska Range
Avalanche Report

Report not available. See EARAC for more information.

Chilkat Pass
Avalanche Report

Report not available. See HAC for more information.

Issued at: Friday, March 01, 2024 7:00AM
Issued by: HAC

Lutak
Avalanche Report

Report not available. See HAC for more information.

Issued at: Sunday, April 14, 2024 6:00AM
Issued by: HAC

Transitional
Avalanche Report

Report not available. See HAC for more information.

Issued at: Sunday, April 14, 2024 6:00AM
Issued by: HAC

Hatcher Pass
Avalanche Report

Report not available. See HPAC for more information.

Issued at: Saturday, April 20, 2024 6:37AM
Issued by: HPAC

Continental
Avalanche Report

2024-04-27 Avalanche Danger

• Considerable danger (above 6101')
• Considerable danger (4401' to 6100')
• Considerable danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f f7941e
a0-0e0-4400f f7941e

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2024-04-27 Wet Loose

• E to W aspects (above 6101')
• NE to NW aspects (4401' to 6100')
• All aspects (below 4400')

a68-293e6101-20310f A200FF
a23-339e4401-6100f A200FF
a158-158e0-4400f A200FF

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2024-04-27 Wet Slab

• E to W aspects (above 6101')
• E to W aspects (4401' to 6100')
• E to W aspects (below 4400')

a68-293e6101-20310f 0000FF
a68-293e4401-6100f 0000FF
a68-293e0-4400f 0000FF

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Issued at: Friday, April 26, 2024 8:08AM
Issued by: VAC

Intermountain
Avalanche Report

2024-04-27 Avalanche Danger

• Considerable danger (above 6101')
• Considerable danger (4401' to 6100')
• Considerable danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f f7941e
a0-0e0-4400f f7941e

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2024-04-27 Wet Loose

• E to W aspects (above 6101')
• NE to NW aspects (4401' to 6100')
• All aspects (below 4400')

a68-293e6101-20310f A200FF
a23-339e4401-6100f A200FF
a158-158e0-4400f A200FF

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2024-04-27 Wet Slab

• E to W aspects (above 6101')
• E to W aspects (4401' to 6100')
• E to W aspects (below 4400')

a68-293e6101-20310f 0000FF
a68-293e4401-6100f 0000FF
a68-293e0-4400f 0000FF

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Issued at: Friday, April 26, 2024 8:08AM
Issued by: VAC

Maritime
Avalanche Report

2024-04-27 Avalanche Danger

• Considerable danger (above 6101')
• Considerable danger (4401' to 6100')
• Considerable danger (below 4400')

a0-0e6101-20310f f7941e
a0-0e4401-6100f f7941e
a0-0e0-4400f f7941e

Copy to clipboard

2024-04-27 Wet Loose

• E to W aspects (above 6101')
• NE to NW aspects (4401' to 6100')
• All aspects (below 4400')

a68-293e6101-20310f A200FF
a23-339e4401-6100f A200FF
a158-158e0-4400f A200FF

Copy to clipboard

2024-04-27 Wet Slab

• E to W aspects (above 6101')
• E to W aspects (4401' to 6100')
• E to W aspects (below 4400')

a68-293e6101-20310f 0000FF
a68-293e4401-6100f 0000FF
a68-293e0-4400f 0000FF

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Issued at: Friday, April 26, 2024 8:08AM
Issued by: VAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:20AM Shade	62 by 1 Copy to clipboard
2024-04-27 07:50AM Shade	82 by 12 Copy to clipboard
2024-04-27 09:20AM Shade	102 by 22 Copy to clipboard
2024-04-27 10:50AM Shade	124 by 32 Copy to clipboard
2024-04-27 12:20PM Shade	149 by 40 Copy to clipboard
2024-04-27 01:50PM Shade	178 by 43 Copy to clipboard
2024-04-27 03:20PM Shade	207 by 41 Copy to clipboard
2024-04-27 04:50PM Shade	233 by 34 Copy to clipboard
2024-04-27 06:20PM Shade	256 by 24 Copy to clipboard
2024-04-27 07:50PM Shade	276 by 13 Copy to clipboard
2024-04-27 09:20PM Shade	295 by 3 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:20AM Shade	62 by 1 Copy to clipboard
2024-04-27 07:50AM Shade	82 by 12 Copy to clipboard
2024-04-27 09:20AM Shade	101 by 23 Copy to clipboard
2024-04-27 10:50AM Shade	123 by 33 Copy to clipboard
2024-04-27 12:20PM Shade	149 by 41 Copy to clipboard
2024-04-27 01:50PM Shade	178 by 44 Copy to clipboard
2024-04-27 03:20PM Shade	208 by 41 Copy to clipboard
2024-04-27 04:50PM Shade	234 by 34 Copy to clipboard
2024-04-27 06:20PM Shade	256 by 24 Copy to clipboard
2024-04-27 07:50PM Shade	276 by 13 Copy to clipboard
2024-04-27 09:20PM Shade	295 by 2 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:20AM Shade	63 by 1 Copy to clipboard
2024-04-27 07:50AM Shade	82 by 12 Copy to clipboard
2024-04-27 09:20AM Shade	102 by 23 Copy to clipboard
2024-04-27 10:50AM Shade	123 by 33 Copy to clipboard
2024-04-27 12:20PM Shade	149 by 40 Copy to clipboard
2024-04-27 01:50PM Shade	178 by 44 Copy to clipboard
2024-04-27 03:20PM Shade	208 by 41 Copy to clipboard
2024-04-27 04:50PM Shade	234 by 34 Copy to clipboard
2024-04-27 06:20PM Shade	256 by 24 Copy to clipboard
2024-04-27 07:50PM Shade	276 by 13 Copy to clipboard
2024-04-27 09:20PM Shade	295 by 3 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-26 06:20AM Shade	63 by 1 Copy to clipboard
2024-04-26 07:50AM Shade	82 by 12 Copy to clipboard
2024-04-26 09:20AM Shade	102 by 22 Copy to clipboard
2024-04-26 10:50AM Shade	124 by 33 Copy to clipboard
2024-04-26 12:20PM Shade	150 by 40 Copy to clipboard
2024-04-26 01:50PM Shade	179 by 43 Copy to clipboard
2024-04-26 03:20PM Shade	208 by 41 Copy to clipboard
2024-04-26 04:50PM Shade	234 by 33 Copy to clipboard
2024-04-26 06:20PM Shade	256 by 24 Copy to clipboard
2024-04-26 07:50PM Shade	276 by 13 Copy to clipboard
2024-04-26 09:20PM Shade	295 by 2 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 05:30AM Shade	65 by 1 Copy to clipboard
2024-04-27 07:00AM Shade	83 by 13 Copy to clipboard
2024-04-27 08:30AM Shade	103 by 24 Copy to clipboard
2024-04-27 10:00AM Shade	125 by 35 Copy to clipboard
2024-04-27 11:30AM Shade	151 by 43 Copy to clipboard
2024-04-27 01:00PM Shade	181 by 46 Copy to clipboard
2024-04-27 02:30PM Shade	212 by 42 Copy to clipboard
2024-04-27 04:00PM Shade	238 by 34 Copy to clipboard
2024-04-27 05:30PM Shade	259 by 23 Copy to clipboard
2024-04-27 07:00PM Shade	278 by 12 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:00AM Shade	62 by 1 Copy to clipboard
2024-04-27 07:30AM Shade	81 by 11 Copy to clipboard
2024-04-27 09:00AM Shade	101 by 22 Copy to clipboard
2024-04-27 10:30AM Shade	123 by 32 Copy to clipboard
2024-04-27 12:00PM Shade	148 by 40 Copy to clipboard
2024-04-27 01:30PM Shade	177 by 44 Copy to clipboard
2024-04-27 03:00PM Shade	207 by 41 Copy to clipboard
2024-04-27 04:30PM Shade	233 by 34 Copy to clipboard
2024-04-27 06:00PM Shade	255 by 24 Copy to clipboard
2024-04-27 07:30PM Shade	275 by 13 Copy to clipboard
2024-04-27 09:00PM Shade	295 by 3 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 05:50AM Shade	59 by 1 Copy to clipboard
2024-04-27 07:20AM Shade	79 by 10 Copy to clipboard
2024-04-27 08:50AM Shade	99 by 20 Copy to clipboard
2024-04-27 10:20AM Shade	121 by 30 Copy to clipboard
2024-04-27 11:50AM Shade	146 by 37 Copy to clipboard
2024-04-27 01:20PM Shade	174 by 41 Copy to clipboard
2024-04-27 02:50PM Shade	202 by 39 Copy to clipboard
2024-04-27 04:20PM Shade	228 by 34 Copy to clipboard
2024-04-27 05:50PM Shade	251 by 25 Copy to clipboard
2024-04-27 07:20PM Shade	272 by 15 Copy to clipboard
2024-04-27 08:50PM Shade	292 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-03-02 08:10AM Shade	105 by 1 Copy to clipboard
2024-03-02 09:40AM Shade	125 by 11 Copy to clipboard
2024-03-02 11:10AM Shade	146 by 19 Copy to clipboard
2024-03-02 12:40PM Shade	170 by 23 Copy to clipboard
2024-03-02 02:10PM Shade	194 by 23 Copy to clipboard
2024-03-02 03:40PM Shade	217 by 18 Copy to clipboard
2024-03-02 05:10PM Shade	239 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-15 06:00AM Shade	72 by 1 Copy to clipboard
2024-04-15 07:30AM Shade	91 by 12 Copy to clipboard
2024-04-15 09:00AM Shade	111 by 23 Copy to clipboard
2024-04-15 10:30AM Shade	134 by 33 Copy to clipboard
2024-04-15 12:00PM Shade	160 by 39 Copy to clipboard
2024-04-15 01:30PM Shade	189 by 41 Copy to clipboard
2024-04-15 03:00PM Shade	217 by 36 Copy to clipboard
2024-04-15 04:30PM Shade	241 by 28 Copy to clipboard
2024-04-15 06:00PM Shade	262 by 17 Copy to clipboard
2024-04-15 07:30PM Shade	281 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-15 06:00AM Shade	71 by 1 Copy to clipboard
2024-04-15 07:30AM Shade	90 by 12 Copy to clipboard
2024-04-15 09:00AM Shade	110 by 23 Copy to clipboard
2024-04-15 10:30AM Shade	133 by 33 Copy to clipboard
2024-04-15 12:00PM Shade	159 by 39 Copy to clipboard
2024-04-15 01:30PM Shade	188 by 41 Copy to clipboard
2024-04-15 03:00PM Shade	216 by 36 Copy to clipboard
2024-04-15 04:30PM Shade	240 by 28 Copy to clipboard
2024-04-15 06:00PM Shade	261 by 17 Copy to clipboard
2024-04-15 07:30PM Shade	281 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-21 06:30AM Shade	66 by 1 Copy to clipboard
2024-04-21 08:00AM Shade	85 by 11 Copy to clipboard
2024-04-21 09:30AM Shade	105 by 22 Copy to clipboard
2024-04-21 11:00AM Shade	128 by 31 Copy to clipboard
2024-04-21 12:30PM Shade	153 by 38 Copy to clipboard
2024-04-21 02:00PM Shade	181 by 40 Copy to clipboard
2024-04-21 03:30PM Shade	210 by 38 Copy to clipboard
2024-04-21 05:00PM Shade	235 by 31 Copy to clipboard
2024-04-21 06:30PM Shade	257 by 21 Copy to clipboard
2024-04-21 08:00PM Shade	277 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:00AM Shade	62 by 1 Copy to clipboard
2024-04-27 07:30AM Shade	81 by 11 Copy to clipboard
2024-04-27 09:00AM Shade	101 by 22 Copy to clipboard
2024-04-27 10:30AM Shade	123 by 32 Copy to clipboard
2024-04-27 12:00PM Shade	148 by 40 Copy to clipboard
2024-04-27 01:30PM Shade	177 by 43 Copy to clipboard
2024-04-27 03:00PM Shade	206 by 41 Copy to clipboard
2024-04-27 04:30PM Shade	232 by 34 Copy to clipboard
2024-04-27 06:00PM Shade	255 by 24 Copy to clipboard
2024-04-27 07:30PM Shade	275 by 14 Copy to clipboard
2024-04-27 09:00PM Shade	294 by 3 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:00AM Shade	61 by 1 Copy to clipboard
2024-04-27 07:30AM Shade	81 by 11 Copy to clipboard
2024-04-27 09:00AM Shade	101 by 22 Copy to clipboard
2024-04-27 10:30AM Shade	122 by 32 Copy to clipboard
2024-04-27 12:00PM Shade	148 by 40 Copy to clipboard
2024-04-27 01:30PM Shade	177 by 43 Copy to clipboard
2024-04-27 03:00PM Shade	206 by 41 Copy to clipboard
2024-04-27 04:30PM Shade	232 by 34 Copy to clipboard
2024-04-27 06:00PM Shade	255 by 24 Copy to clipboard
2024-04-27 07:30PM Shade	275 by 14 Copy to clipboard
2024-04-27 09:00PM Shade	294 by 3 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-27 06:00AM Shade	61 by 1 Copy to clipboard
2024-04-27 07:30AM Shade	80 by 11 Copy to clipboard
2024-04-27 09:00AM Shade	100 by 22 Copy to clipboard
2024-04-27 10:30AM Shade	122 by 32 Copy to clipboard
2024-04-27 12:00PM Shade	147 by 40 Copy to clipboard
2024-04-27 01:30PM Shade	176 by 43 Copy to clipboard
2024-04-27 03:00PM Shade	205 by 41 Copy to clipboard
2024-04-27 04:30PM Shade	232 by 34 Copy to clipboard
2024-04-27 06:00PM Shade	254 by 25 Copy to clipboard
2024-04-27 07:30PM Shade	274 by 14 Copy to clipboard
2024-04-27 09:00PM Shade	294 by 3 Copy to clipboard

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