I'm really not sure on that. I was just looking at the annual report the UAC has on their website.
I guess my point is, before donating, I want to make sure the money is being well-spent. For instance, the NWAC shuts down at the _beginning_ of "the climbing season", so it serves little use to the "typical" Cascade snow climber in Spring. Granted, they do issue special bulletins on Extreme-rated days, but they are almost always winding down when things get interesting from a climber's (and spring ski mountaineer's) perspective.
I like how the UAC issues their bulletins for laypeople.
This forecast (http://www.avalanche.org/~uac/newadvisory/advisory.php)
for instance is a nice summary with a stability rose. The NWAC forecast, while quite thorough, can be a chore sometimes.