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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Flathead Range & Glacier NP
Avalanche Report

2024-04-02 Avalanche Danger

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

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

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2024-04-09 Wind Slab

• NW to SE aspects (above 6101')

a293-158e6101-20310f A200FF

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2024-04-09 Wet Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a113-113e4401-6100f 0000FF

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Issued at: Monday, April 08, 2024 7:03AM
Issued by: FAC

Swan Range
Avalanche Report

2024-04-02 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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2024-04-09 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')

a293-293e6101-20310f A200FF
a113-113e4401-6100f A200FF

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2024-04-09 Wet Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a113-113e4401-6100f 0000FF

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Issued at: Monday, April 08, 2024 6:57AM
Issued by: FAC

Whitefish Range
Avalanche Report

2024-04-02 Avalanche Danger

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

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

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2024-04-09 Storm Slab

• All aspects (above 6101')
• All aspects (4401' to 6100')

a293-293e6101-20310f A200FF
a113-113e4401-6100f A200FF

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2024-04-09 Wet Loose

• All aspects (above 6101')
• All aspects (4401' to 6100')

a158-158e6101-20310f 0000FF
a113-113e4401-6100f 0000FF

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Issued at: Monday, April 08, 2024 6:56AM
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: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Island Park
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Lionhead Area
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Northern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Northern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Southern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Southern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Monday, April 08, 2024 7:06AM
Issued by: GNFAC

Kootenai
Avalanche Report

Report not available. See IPAC for more information.

Issued at: Saturday, March 30, 2024 6:30AM
Issued by: IPAC

Bitterroot
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Monday, April 01, 2024 1:00AM
Issued by: WCMAC

Rattlesnake
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Monday, April 01, 2024 1:00AM
Issued by: WCMAC

Seeley Lake
Avalanche Report

Report not available. See WCMAC for more information.

Issued at: Monday, April 01, 2024 1:00AM
Issued by: WCMAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:10AM Shade	80 by 2 Copy to clipboard
2024-04-09 08:40AM Shade	97 by 17 Copy to clipboard
2024-04-09 10:10AM Shade	115 by 31 Copy to clipboard
2024-04-09 11:40AM Shade	139 by 43 Copy to clipboard
2024-04-09 01:10PM Shade	170 by 49 Copy to clipboard
2024-04-09 02:40PM Shade	204 by 47 Copy to clipboard
2024-04-09 04:10PM Shade	232 by 38 Copy to clipboard
2024-04-09 05:40PM Shade	253 by 25 Copy to clipboard
2024-04-09 07:10PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:10AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:40AM Shade	97 by 16 Copy to clipboard
2024-04-09 10:10AM Shade	115 by 31 Copy to clipboard
2024-04-09 11:40AM Shade	139 by 43 Copy to clipboard
2024-04-09 01:10PM Shade	170 by 49 Copy to clipboard
2024-04-09 02:40PM Shade	204 by 48 Copy to clipboard
2024-04-09 04:10PM Shade	232 by 39 Copy to clipboard
2024-04-09 05:40PM Shade	253 by 25 Copy to clipboard
2024-04-09 07:10PM Shade	270 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:10AM Shade	79 by 1 Copy to clipboard
2024-04-09 08:40AM Shade	96 by 16 Copy to clipboard
2024-04-09 10:10AM Shade	115 by 30 Copy to clipboard
2024-04-09 11:40AM Shade	138 by 42 Copy to clipboard
2024-04-09 01:10PM Shade	169 by 49 Copy to clipboard
2024-04-09 02:40PM Shade	202 by 47 Copy to clipboard
2024-04-09 04:10PM Shade	231 by 38 Copy to clipboard
2024-04-09 05:40PM Shade	252 by 25 Copy to clipboard
2024-04-09 07:10PM Shade	270 by 11 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-08 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-08 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-08 10:00AM Shade	114 by 32 Copy to clipboard
2024-04-08 11:30AM Shade	138 by 44 Copy to clipboard
2024-04-08 01:00PM Shade	170 by 51 Copy to clipboard
2024-04-08 02:30PM Shade	205 by 49 Copy to clipboard
2024-04-08 04:00PM Shade	233 by 39 Copy to clipboard
2024-04-08 05:30PM Shade	254 by 25 Copy to clipboard
2024-04-08 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	81 by 2 Copy to clipboard
2024-04-09 08:30AM Shade	97 by 18 Copy to clipboard
2024-04-09 10:00AM Shade	115 by 33 Copy to clipboard
2024-04-09 11:30AM Shade	139 by 46 Copy to clipboard
2024-04-09 01:00PM Shade	171 by 53 Copy to clipboard
2024-04-09 02:30PM Shade	207 by 50 Copy to clipboard
2024-04-09 04:00PM Shade	235 by 40 Copy to clipboard
2024-04-09 05:30PM Shade	255 by 25 Copy to clipboard
2024-04-09 07:00PM Shade	272 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	95 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	113 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	136 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	169 by 53 Copy to clipboard
2024-04-09 02:30PM Shade	205 by 51 Copy to clipboard
2024-04-09 04:00PM Shade	234 by 41 Copy to clipboard
2024-04-09 05:30PM Shade	254 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 11 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	113 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	137 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	169 by 53 Copy to clipboard
2024-04-09 02:30PM Shade	205 by 51 Copy to clipboard
2024-04-09 04:00PM Shade	234 by 41 Copy to clipboard
2024-04-09 05:30PM Shade	254 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	114 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	137 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	170 by 52 Copy to clipboard
2024-04-09 02:30PM Shade	205 by 50 Copy to clipboard
2024-04-09 04:00PM Shade	234 by 40 Copy to clipboard
2024-04-09 05:30PM Shade	254 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	114 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	137 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	169 by 52 Copy to clipboard
2024-04-09 02:30PM Shade	205 by 50 Copy to clipboard
2024-04-09 04:00PM Shade	233 by 40 Copy to clipboard
2024-04-09 05:30PM Shade	254 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	114 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	137 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	170 by 53 Copy to clipboard
2024-04-09 02:30PM Shade	206 by 50 Copy to clipboard
2024-04-09 04:00PM Shade	234 by 40 Copy to clipboard
2024-04-09 05:30PM Shade	255 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-09 07:00AM Shade	80 by 1 Copy to clipboard
2024-04-09 08:30AM Shade	96 by 17 Copy to clipboard
2024-04-09 10:00AM Shade	113 by 32 Copy to clipboard
2024-04-09 11:30AM Shade	137 by 45 Copy to clipboard
2024-04-09 01:00PM Shade	169 by 53 Copy to clipboard
2024-04-09 02:30PM Shade	205 by 51 Copy to clipboard
2024-04-09 04:00PM Shade	234 by 40 Copy to clipboard
2024-04-09 05:30PM Shade	254 by 26 Copy to clipboard
2024-04-09 07:00PM Shade	271 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-03-31 07:30AM Shade	84 by 1 Copy to clipboard
2024-03-31 09:00AM Shade	101 by 15 Copy to clipboard
2024-03-31 10:30AM Shade	120 by 29 Copy to clipboard
2024-03-31 12:00PM Shade	144 by 40 Copy to clipboard
2024-03-31 01:30PM Shade	174 by 46 Copy to clipboard
2024-03-31 03:00PM Shade	205 by 43 Copy to clipboard
2024-03-31 04:30PM Shade	232 by 34 Copy to clipboard
2024-03-31 06:00PM Shade	252 by 21 Copy to clipboard
2024-03-31 07:30PM Shade	270 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-02 07:30AM Shade	84 by 2 Copy to clipboard
2024-04-02 09:00AM Shade	101 by 17 Copy to clipboard
2024-04-02 10:30AM Shade	120 by 32 Copy to clipboard
2024-04-02 12:00PM Shade	144 by 44 Copy to clipboard
2024-04-02 01:30PM Shade	176 by 49 Copy to clipboard
2024-04-02 03:00PM Shade	209 by 46 Copy to clipboard
2024-04-02 04:30PM Shade	235 by 35 Copy to clipboard
2024-04-02 06:00PM Shade	255 by 21 Copy to clipboard
2024-04-02 07:30PM Shade	272 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-02 07:20AM Shade	83 by 1 Copy to clipboard
2024-04-02 08:50AM Shade	100 by 16 Copy to clipboard
2024-04-02 10:20AM Shade	118 by 30 Copy to clipboard
2024-04-02 11:50AM Shade	142 by 42 Copy to clipboard
2024-04-02 01:20PM Shade	173 by 48 Copy to clipboard
2024-04-02 02:50PM Shade	206 by 46 Copy to clipboard
2024-04-02 04:20PM Shade	233 by 36 Copy to clipboard
2024-04-02 05:50PM Shade	253 by 22 Copy to clipboard
2024-04-02 07:20PM Shade	270 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-02 07:20AM Shade	83 by 1 Copy to clipboard
2024-04-02 08:50AM Shade	100 by 16 Copy to clipboard
2024-04-02 10:20AM Shade	119 by 31 Copy to clipboard
2024-04-02 11:50AM Shade	143 by 42 Copy to clipboard
2024-04-02 01:20PM Shade	174 by 48 Copy to clipboard
2024-04-02 02:50PM Shade	206 by 45 Copy to clipboard
2024-04-02 04:20PM Shade	233 by 36 Copy to clipboard
2024-04-02 05:50PM Shade	253 by 22 Copy to clipboard
2024-04-02 07:20PM Shade	271 by 7 Copy to clipboard

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