I've added a slope analysis layer that allows you to shade slopes by angle and aspect. It's a good high-level visualization of potential avalanche starting zones that can assist with safe route planning, but it's important to remember that it's also just a tool, it should be one of many in your toolkit, and is in no way a substitute for good decision making based on conditions you observe on the ground. Some known limitations are listed here: http://caltopo.blogspot.com/2012/02/ava ... lysis.html
As an example, here's Shasta shaded by slope angle:http://caltopo.com/map.html#ll=41.4,-122.2&z=14&b=t&n=0.25&o=r&a=slp_s-11111111
And here's Shasta with the S-E aspects shaded orange:http://caltopo.com/map.html#ll=41.4,-122.2&z=14&b=t&n=0.25&o=r&a=slp_a-11333111
You can click the + in the top right corner to switch between shading by aspect and angle, and also to enter danger-rose-style colors when shading by aspect. I'm still trying to sort out some server performance issues, so the shading may take a while to load.
This is all highly experimental, and I welcome any feedback. In particular, I had to take guesses at what slope cutoffs to use and how to actually do the shading. This info is on the bottom right of the screen, but since it's subtle:
Shading by aspect: slopes between 28 and 59 degrees are shaded, with 35-45 having dots on top to differentiate them.
Shading by angle: