Spring the season has arrived, and it's not just calendar spring either, it's really felt different in the mountains the past week.  The snowpack is far from isothermic, but the mercury has climbed above 0 as high as 2500m over the last 7 days.  These warm temps have really helped to settle out the upper snowpack.  Professionals throughout the region are reporting a very well settled & firm upper snowpack with minimum concerns in the upper 150cm.  The spring sun is increasing in strength as each day grows by a few minutes.  It takes very little time for S, SE & SW aspects to feel the heat of the sun now.  W & E facing slopes are just starting to be affected by the sun as we head into the tail end of March.The effect of the sun becomes very important at this time of the year.  We're expecting 5 - 10 cm of snow above 1500 m the next few days.  As soon as the sun comes out, watch for roller-balling & pin-wheeling to start surprisingly quickly.  Wet point release avalanches won't be far behind on slopes receiving direct sun.There's a lot of strong snow between recreationists and the February surface hoar layers and it's been a few days since there was a large deep avalanche in the region.  That being said, it could still be triggered.  I'm thinking of three different scenarios at the moment:  1.  The most likely scenario is a large cornice or icefall failure impacting the slope below and producing a very large avalanche.  Managing this piece of the hazard puzzle is done by monitoring what's happening above you.  Cornices or slopes receiving direct sun are suspect.  If you feel like there's a question as to whether or not a piece of cornice is warming to its breaking point, then, there's no question, it's time to get off that slope.  2.  Just last weekend an experienced party remote triggered a very large avalanche in Glacier Park near Mt. Tupper.  This makes me think that it may still be possible for skiers or sledders to trigger very large avalanches failing 1.5 - 2m in depth.  The most likely location for this type of failure is where the snowpack goes from thick to thin.  This is most likely near ridge crests, the edges of slopes and especially around rock outcroppings.  3.  While I don't foresee it occurring in the next few days, a slope that does not experience an overnight refreeze is suspect for producing large avalanches.  This is something to think about as we flip our calendars to the April page.