A "trend"? Check the data against 2010 levels:
http://www.mt.nrcs.usda.gov/snow/data/comparison.html
The Bitterroot drainage is at 2110% of what it was last year at this time. 2008 and 2009 were pretty good water years (after a brutal 2007); 2010 was looking pretty grim but had a damp summer that kept fire threat down. If it's a trend Montana is in for some interesting times.
Regards,
Scott