New Hampshire Avalanche Map

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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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Presidential Range

Pre-populated CalTopo Map

Avalanche Report

2023-03-21 Avalanche Danger

• Low danger (above 5101')
• Moderate danger (3001' to 5100')
• Low danger (below 3000')

a0-0e5101-20310f 50b848
a0-0e3001-5100f fff200
a0-0e0-3000f 50b848

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2023-03-21 Wind Slab

• NE to S aspects (above 5101')
• NE to S aspects (3001' to 5100')

a23-203e5101-20310f A200FF
a23-203e3001-5100f A200FF

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Issued at: Monday, March 20, 2023 4:01AM
Issued by: MWAC

Sunlight Angles

Time of day	Lighting (Az/Z)
2023-03-21 07:00AM Shade	91 by 2 Copy to clipboard
2023-03-21 08:30AM Shade	107 by 17 Copy to clipboard
2023-03-21 10:00AM Shade	127 by 32 Copy to clipboard
2023-03-21 11:30AM Shade	152 by 42 Copy to clipboard
2023-03-21 01:00PM Shade	183 by 46 Copy to clipboard
2023-03-21 02:30PM Shade	213 by 41 Copy to clipboard
2023-03-21 04:00PM Shade	237 by 30 Copy to clipboard
2023-03-21 05:30PM Shade	256 by 15 Copy to clipboard

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