Link to a recent article by Chris Peterson in the Hungry Horse News about the hike to Sperry Chalet after the Sprague Fire.
I recall that during our hike to the Chalet in 2001 a light drizzle started around Crystal Ford but because we were in the trees, we didn't really need to break out any rain gear. I guess that would not be the case now:
http://www.hungryhorsenews.com/glacier_ ... rague_fire