New Hampshire 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.

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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: Presidential Range

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Pre-populated CalTopo Map

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Presidential Range
Avalanche Report

Report not available. See MWAC for more information.

Issued at: Tuesday, April 23, 2024 6:46AM
Issued by: MWAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2024-04-24 06:00AM Shade	73 by 2 Copy to clipboard
2024-04-24 07:30AM Shade	89 by 17 Copy to clipboard
2024-04-24 09:00AM Shade	105 by 33 Copy to clipboard
2024-04-24 10:30AM Shade	127 by 48 Copy to clipboard
2024-04-24 12:00PM Shade	160 by 58 Copy to clipboard
2024-04-24 01:30PM Shade	201 by 57 Copy to clipboard
2024-04-24 03:00PM Shade	234 by 47 Copy to clipboard
2024-04-24 04:30PM Shade	256 by 33 Copy to clipboard
2024-04-24 06:00PM Shade	272 by 17 Copy to clipboard
2024-04-24 07:30PM Shade	288 by 1 Copy to clipboard

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