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

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Flathead Range & Glacier NP
Avalanche Report

Report not available. See FAC for more information.

Issued at: Friday, May 03, 2024 6:42AM
Issued by: FAC

Swan Range
Avalanche Report

Report not available. See FAC for more information.

Issued at: Friday, May 03, 2024 6:42AM
Issued by: FAC

Whitefish Range
Avalanche Report

Report not available. See FAC for more information.

Issued at: Friday, May 03, 2024 6:42AM
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, May 02, 2024 4:50PM
Issued by: GNFAC

Island Park
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
Issued by: GNFAC

Lionhead Area
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
Issued by: GNFAC

Northern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
Issued by: GNFAC

Northern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
Issued by: GNFAC

Southern Gallatin Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
Issued by: GNFAC

Southern Madison Range
Avalanche Report

Report not available. See GNFAC for more information.

Issued at: Thursday, May 02, 2024 4:50PM
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)
2024-05-04 06:20AM Shade	66 by 1 Copy to clipboard
2024-05-04 07:50AM Shade	82 by 15 Copy to clipboard
2024-05-04 09:20AM Shade	99 by 30 Copy to clipboard
2024-05-04 10:50AM Shade	120 by 44 Copy to clipboard
2024-05-04 12:20PM Shade	149 by 55 Copy to clipboard
2024-05-04 01:50PM Shade	188 by 58 Copy to clipboard
2024-05-04 03:20PM Shade	224 by 51 Copy to clipboard
2024-05-04 04:50PM Shade	249 by 39 Copy to clipboard
2024-05-04 06:20PM Shade	268 by 24 Copy to clipboard
2024-05-04 07:50PM Shade	284 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-04 06:20AM Shade	66 by 1 Copy to clipboard
2024-05-04 07:50AM Shade	82 by 15 Copy to clipboard
2024-05-04 09:20AM Shade	99 by 30 Copy to clipboard
2024-05-04 10:50AM Shade	120 by 44 Copy to clipboard
2024-05-04 12:20PM Shade	149 by 55 Copy to clipboard
2024-05-04 01:50PM Shade	188 by 58 Copy to clipboard
2024-05-04 03:20PM Shade	224 by 51 Copy to clipboard
2024-05-04 04:50PM Shade	249 by 39 Copy to clipboard
2024-05-04 06:20PM Shade	268 by 24 Copy to clipboard
2024-05-04 07:50PM Shade	284 by 9 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-04 06:30AM Shade	67 by 2 Copy to clipboard
2024-05-04 08:00AM Shade	84 by 16 Copy to clipboard
2024-05-04 09:30AM Shade	101 by 31 Copy to clipboard
2024-05-04 11:00AM Shade	122 by 45 Copy to clipboard
2024-05-04 12:30PM Shade	152 by 55 Copy to clipboard
2024-05-04 02:00PM Shade	191 by 57 Copy to clipboard
2024-05-04 03:30PM Shade	226 by 50 Copy to clipboard
2024-05-04 05:00PM Shade	250 by 37 Copy to clipboard
2024-05-04 06:30PM Shade	269 by 23 Copy to clipboard
2024-05-04 08:00PM Shade	286 by 8 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-13 06:10AM Shade	65 by 2 Copy to clipboard
2024-05-13 07:40AM Shade	80 by 17 Copy to clipboard
2024-05-13 09:10AM Shade	96 by 32 Copy to clipboard
2024-05-13 10:40AM Shade	116 by 47 Copy to clipboard
2024-05-13 12:10PM Shade	146 by 59 Copy to clipboard
2024-05-13 01:40PM Shade	190 by 63 Copy to clipboard
2024-05-13 03:10PM Shade	229 by 55 Copy to clipboard
2024-05-13 04:40PM Shade	254 by 41 Copy to clipboard
2024-05-13 06:10PM Shade	271 by 25 Copy to clipboard
2024-05-13 07:40PM Shade	287 by 10 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	69 by 2 Copy to clipboard
2024-05-03 07:50AM Shade	84 by 17 Copy to clipboard
2024-05-03 09:20AM Shade	101 by 33 Copy to clipboard
2024-05-03 10:50AM Shade	122 by 48 Copy to clipboard
2024-05-03 12:20PM Shade	153 by 59 Copy to clipboard
2024-05-03 01:50PM Shade	196 by 60 Copy to clipboard
2024-05-03 03:20PM Shade	232 by 51 Copy to clipboard
2024-05-03 04:50PM Shade	255 by 37 Copy to clipboard
2024-05-03 06:20PM Shade	272 by 21 Copy to clipboard
2024-05-03 07:50PM Shade	287 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:30AM Shade	69 by 2 Copy to clipboard
2024-05-03 08:00AM Shade	85 by 18 Copy to clipboard
2024-05-03 09:30AM Shade	101 by 34 Copy to clipboard
2024-05-03 11:00AM Shade	122 by 48 Copy to clipboard
2024-05-03 12:30PM Shade	154 by 59 Copy to clipboard
2024-05-03 02:00PM Shade	198 by 60 Copy to clipboard
2024-05-03 03:30PM Shade	233 by 51 Copy to clipboard
2024-05-03 05:00PM Shade	256 by 36 Copy to clipboard
2024-05-03 06:30PM Shade	273 by 21 Copy to clipboard
2024-05-03 08:00PM Shade	288 by 5 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	68 by 1 Copy to clipboard
2024-05-03 07:50AM Shade	83 by 16 Copy to clipboard
2024-05-03 09:20AM Shade	99 by 32 Copy to clipboard
2024-05-03 10:50AM Shade	120 by 47 Copy to clipboard
2024-05-03 12:20PM Shade	151 by 58 Copy to clipboard
2024-05-03 01:50PM Shade	194 by 61 Copy to clipboard
2024-05-03 03:20PM Shade	230 by 52 Copy to clipboard
2024-05-03 04:50PM Shade	254 by 38 Copy to clipboard
2024-05-03 06:20PM Shade	271 by 22 Copy to clipboard
2024-05-03 07:50PM Shade	286 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	68 by 1 Copy to clipboard
2024-05-03 07:50AM Shade	84 by 16 Copy to clipboard
2024-05-03 09:20AM Shade	100 by 32 Copy to clipboard
2024-05-03 10:50AM Shade	121 by 47 Copy to clipboard
2024-05-03 12:20PM Shade	152 by 58 Copy to clipboard
2024-05-03 01:50PM Shade	194 by 60 Copy to clipboard
2024-05-03 03:20PM Shade	230 by 51 Copy to clipboard
2024-05-03 04:50PM Shade	254 by 38 Copy to clipboard
2024-05-03 06:20PM Shade	271 by 22 Copy to clipboard
2024-05-03 07:50PM Shade	286 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	68 by 1 Copy to clipboard
2024-05-03 07:50AM Shade	83 by 16 Copy to clipboard
2024-05-03 09:20AM Shade	100 by 32 Copy to clipboard
2024-05-03 10:50AM Shade	120 by 47 Copy to clipboard
2024-05-03 12:20PM Shade	151 by 58 Copy to clipboard
2024-05-03 01:50PM Shade	193 by 60 Copy to clipboard
2024-05-03 03:20PM Shade	230 by 52 Copy to clipboard
2024-05-03 04:50PM Shade	253 by 38 Copy to clipboard
2024-05-03 06:20PM Shade	271 by 22 Copy to clipboard
2024-05-03 07:50PM Shade	286 by 7 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	68 by 1 Copy to clipboard
2024-05-03 07:50AM Shade	84 by 16 Copy to clipboard
2024-05-03 09:20AM Shade	100 by 32 Copy to clipboard
2024-05-03 10:50AM Shade	120 by 47 Copy to clipboard
2024-05-03 12:20PM Shade	151 by 58 Copy to clipboard
2024-05-03 01:50PM Shade	194 by 60 Copy to clipboard
2024-05-03 03:20PM Shade	230 by 52 Copy to clipboard
2024-05-03 04:50PM Shade	254 by 38 Copy to clipboard
2024-05-03 06:20PM Shade	271 by 22 Copy to clipboard
2024-05-03 07:50PM Shade	287 by 6 Copy to clipboard

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-05-03 06:20AM Shade	68 by 1 Copy to clipboard
2024-05-03 07:50AM Shade	83 by 16 Copy to clipboard
2024-05-03 09:20AM Shade	100 by 32 Copy to clipboard
2024-05-03 10:50AM Shade	120 by 47 Copy to clipboard
2024-05-03 12:20PM Shade	151 by 58 Copy to clipboard
2024-05-03 01:50PM Shade	194 by 60 Copy to clipboard
2024-05-03 03:20PM Shade	230 by 52 Copy to clipboard
2024-05-03 04:50PM Shade	254 by 38 Copy to clipboard
2024-05-03 06:20PM Shade	271 by 22 Copy to clipboard
2024-05-03 07:50PM Shade	286 by 6 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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