Montana 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: Flathead Range & Glacier NP Swan Range Whitefish Range Bridger Range Cooke City Island Park Lionhead Area Northern Gallatin Range Northern Madison Range Southern Gallatin Range Southern Madison Range Kootenai Bitterroot Rattlesnake Seeley Lake

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Pre-populated CalTopo Map

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Pre-populated CalTopo Map

Pre-populated CalTopo Map

Pre-populated CalTopo Map

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Pre-populated CalTopo Map

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Flathead Range & Glacier NP
Avalanche Report

2023-12-06 Avalanche Danger

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

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-12-08 Storm Slab

• All aspects (above 6101')

a158-158e6101-20310f A200FF

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2023-12-08 Persistent Slab

• All aspects (above 6101')

a158-158e6101-20310f 0000FF

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Issued at: Thursday, December 07, 2023 7:06AM
Issued by: FAC

Swan Range
Avalanche Report

2023-12-06 Avalanche Danger

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

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-12-08 Storm Slab

• All aspects (above 6101')

a158-158e6101-20310f A200FF

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2023-12-08 Persistent Slab

• All aspects (above 6101')

a158-158e6101-20310f 0000FF

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Issued at: Thursday, December 07, 2023 7:06AM
Issued by: FAC

Whitefish Range
Avalanche Report

2023-12-06 Avalanche Danger

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

a0-0e6101-20310f f7941e
a0-0e4401-6100f fff200
a0-0e0-4400f 50b848

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2023-12-08 Storm Slab

• All aspects (above 6101')

a158-158e6101-20310f A200FF

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2023-12-08 Persistent Slab

• All aspects (above 6101')

a158-158e6101-20310f 0000FF

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Issued at: Thursday, December 07, 2023 7:08AM
Issued by: FAC

Bridger Range
Avalanche Report

Report not available. See GNFAC for more information.

Cooke City
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Island Park
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Lionhead Area
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Northern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Northern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Southern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Southern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, December 07, 2023 6:44AM
Issued by: GNFAC

Kootenai
Avalanche Report

Report not available. See IPAC for more information.

Issued at: Sunday, December 03, 2023 6:02PM
Issued by: IPAC

Bitterroot
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Tuesday, December 05, 2023 8:03AM
Issued by: WCMAC

Rattlesnake
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Tuesday, December 05, 2023 8:03AM
Issued by: WCMAC

Seeley Lake
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Tuesday, December 05, 2023 8:03AM
Issued by: WCMAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:30AM Shade	128 by 2 Copy to clipboard
2023-12-08 10:00AM Shade	146 by 12 Copy to clipboard
2023-12-08 11:30AM Shade	166 by 18 Copy to clipboard
2023-12-08 01:00PM Shade	188 by 19 Copy to clipboard
2023-12-08 02:30PM Shade	209 by 14 Copy to clipboard
2023-12-08 04:00PM Shade	228 by 4 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:30AM Shade	127 by 2 Copy to clipboard
2023-12-08 10:00AM Shade	146 by 12 Copy to clipboard
2023-12-08 11:30AM Shade	166 by 18 Copy to clipboard
2023-12-08 01:00PM Shade	188 by 19 Copy to clipboard
2023-12-08 02:30PM Shade	209 by 14 Copy to clipboard
2023-12-08 04:00PM Shade	228 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:30AM Shade	127 by 1 Copy to clipboard
2023-12-08 10:00AM Shade	145 by 11 Copy to clipboard
2023-12-08 11:30AM Shade	166 by 17 Copy to clipboard
2023-12-08 01:00PM Shade	187 by 18 Copy to clipboard
2023-12-08 02:30PM Shade	208 by 14 Copy to clipboard
2023-12-08 04:00PM Shade	227 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-07 08:10AM Shade	126 by 2 Copy to clipboard
2023-12-07 09:40AM Shade	144 by 13 Copy to clipboard
2023-12-07 11:10AM Shade	164 by 20 Copy to clipboard
2023-12-07 12:40PM Shade	186 by 21 Copy to clipboard
2023-12-07 02:10PM Shade	208 by 17 Copy to clipboard
2023-12-07 03:40PM Shade	226 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	125 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	142 by 13 Copy to clipboard
2023-12-08 11:00AM Shade	162 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	185 by 22 Copy to clipboard
2023-12-08 02:00PM Shade	206 by 18 Copy to clipboard
2023-12-08 03:30PM Shade	225 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	124 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	141 by 13 Copy to clipboard
2023-12-08 11:00AM Shade	161 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	183 by 23 Copy to clipboard
2023-12-08 02:00PM Shade	205 by 19 Copy to clipboard
2023-12-08 03:30PM Shade	224 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	124 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	141 by 12 Copy to clipboard
2023-12-08 11:00AM Shade	161 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	183 by 22 Copy to clipboard
2023-12-08 02:00PM Shade	205 by 19 Copy to clipboard
2023-12-08 03:30PM Shade	224 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	124 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	141 by 12 Copy to clipboard
2023-12-08 11:00AM Shade	161 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	184 by 22 Copy to clipboard
2023-12-08 02:00PM Shade	205 by 18 Copy to clipboard
2023-12-08 03:30PM Shade	224 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:10AM Shade	126 by 2 Copy to clipboard
2023-12-08 09:40AM Shade	143 by 13 Copy to clipboard
2023-12-08 11:10AM Shade	163 by 20 Copy to clipboard
2023-12-08 12:40PM Shade	186 by 22 Copy to clipboard
2023-12-08 02:10PM Shade	207 by 17 Copy to clipboard
2023-12-08 03:40PM Shade	226 by 8 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	124 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	141 by 12 Copy to clipboard
2023-12-08 11:00AM Shade	161 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	184 by 22 Copy to clipboard
2023-12-08 02:00PM Shade	205 by 18 Copy to clipboard
2023-12-08 03:30PM Shade	224 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-08 08:00AM Shade	124 by 1 Copy to clipboard
2023-12-08 09:30AM Shade	141 by 12 Copy to clipboard
2023-12-08 11:00AM Shade	161 by 20 Copy to clipboard
2023-12-08 12:30PM Shade	183 by 22 Copy to clipboard
2023-12-08 02:00PM Shade	205 by 18 Copy to clipboard
2023-12-08 03:30PM Shade	224 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-04 08:30AM Shade	126 by 1 Copy to clipboard
2023-12-04 10:00AM Shade	144 by 11 Copy to clipboard
2023-12-04 11:30AM Shade	165 by 18 Copy to clipboard
2023-12-04 01:00PM Shade	187 by 19 Copy to clipboard
2023-12-04 02:30PM Shade	208 by 15 Copy to clipboard
2023-12-04 04:00PM Shade	227 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-06 08:20AM Shade	125 by 1 Copy to clipboard
2023-12-06 09:50AM Shade	143 by 12 Copy to clipboard
2023-12-06 11:20AM Shade	163 by 19 Copy to clipboard
2023-12-06 12:50PM Shade	185 by 21 Copy to clipboard
2023-12-06 02:20PM Shade	207 by 17 Copy to clipboard
2023-12-06 03:50PM Shade	226 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-06 08:20AM Shade	126 by 1 Copy to clipboard
2023-12-06 09:50AM Shade	143 by 12 Copy to clipboard
2023-12-06 11:20AM Shade	164 by 19 Copy to clipboard
2023-12-06 12:50PM Shade	186 by 20 Copy to clipboard
2023-12-06 02:20PM Shade	207 by 16 Copy to clipboard
2023-12-06 03:50PM Shade	226 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-12-06 08:20AM Shade	126 by 1 Copy to clipboard
2023-12-06 09:50AM Shade	144 by 12 Copy to clipboard
2023-12-06 11:20AM Shade	164 by 19 Copy to clipboard
2023-12-06 12:50PM Shade	186 by 20 Copy to clipboard
2023-12-06 02:20PM Shade	207 by 16 Copy to clipboard
2023-12-06 03:50PM Shade	226 by 6 Copy to clipboard

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