It’s shoulder season again – my favourite season – and we’ve just been chased down from the alpine of the Canadian Rocky Mountains by bad weather.  The sky had been threatening all morning, but in the mountains such threats make no promises one way or another so we went ahead and hit the trail up to Sentinel Pass.  Hours later, the weather finally materialized overhead and a cold wet snow blew heavy in our faces with the summit of the mountain pass only a few steep switchbacks…