I believe, to quote another HF member, that in these conditions one needs to pitch the tarp like a steeple not a ranch house and not go to ground with it. This allows the snow to slough off and build a snow wall around you. I use a full length, under the tarp, ridge-line (Spyder line) really wrenched tight to minimize sag. The Spyder line is a little heavy but you can really get a bite on it to make it taut.
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