Using Internet for trip planning.

Diane, the short answer to your question is no. We actually live in a pretty incredible age where Google and others update their satellite imagery almost yearly. You can even use the slider in Earth to look at historic imagery, which can be cool. As far as I know, nobody is taking daily satellite images on the level that would reveal snowpack.

This website:

http://www.nohrsc.noaa.gov/nsa/

is the best I've been able to find for snowpack data. This is NOAA's model for various snow-related variables across the U.S. If you poke around that link you may find some useful info.

And as always, a call to the Forest Service or other agency station closest to your trailhead will likely provide the best, most current information.

Diane, have you checked out http://www.portlandhikers.org? There have been a number of recent trip reports to the Mt. St. Helens area. I haven't paid much attention to them because (1) I can't take my dog there and (2) I'm stuck at home nursing plantar fasciitis.

I personally haven't had a lot of luck calling the Forest Service, since in these days of severe budget cuts most employees can't get out in the field like they used to. Some of the local offices will tell you to check the Portlandhikers.org site instead!

SNOTEL may have the info you’re looking for. I know Hillmap recently added SNOTEL analysis to its list of functions, although I haven’t tried that feature myself.