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.

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: Presidential Range

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Pre-populated CalTopo Map

Presidential Range
Avalanche Report

Report not available. See MWAC for more information.

Issued at: Tuesday, May 02, 2023 7:28AM
Issued by: MWAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-05-03 05:50AM Shade	70 by 2 Copy to clipboard
2023-05-03 07:20AM Shade	85 by 18 Copy to clipboard
2023-05-03 08:50AM Shade	101 by 34 Copy to clipboard
2023-05-03 10:20AM Shade	122 by 49 Copy to clipboard
2023-05-03 11:50AM Shade	155 by 59 Copy to clipboard
2023-05-03 01:20PM Shade	199 by 60 Copy to clipboard
2023-05-03 02:50PM Shade	234 by 51 Copy to clipboard
2023-05-03 04:20PM Shade	256 by 36 Copy to clipboard
2023-05-03 05:50PM Shade	273 by 20 Copy to clipboard
2023-05-03 07:20PM Shade	288 by 4 Copy to clipboard

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