No experience in this area. Let me put my ignorance of these matters on display with the following question.
Can an ID eVENT Unishelter (31oz) be used in these conditions? Why, or Why not? I like this shelter for winter in New England. Haven't used it yet on any exposed eastern mtn. tops (merely "hills"/foothills to you out west - though winds/weather on Mt. Washington in New Hampshire is supposed to rival the tallest peaks of the Himalayas).
I'm thinking low profile to wind. The bivy can be staked down with several stakes so it doesn't blow away in the high wind. Great WPB eVENT fabric to help minimize the condensation possible due to the conditions (precip+no wind) & the small internal air volume, and to keep the moisture outside, ...outside. Rigid, bent, sectioned-hooped Pole (not merely a bendable wire) in head area to keep snow from pressing the bivy against one's face. However, must keep the one stake req'd for longitudinal pole support staked well in the high winds.
However, do I really want 2' to 4' of overnight snowfall [can y'all out West in the Rockies get 6' overnight???] on top of me by morning? Will the fabric in the body section be flapping too much, unless it's volume is filled with a cold weather bag? [I can sleep through most anything, esp. if I'm "whipped" from a day of hard trekking. So, guaranteed, I won't wake up periodically to clear snow off of the bivy. Oh...and any flapping won't wake me either.]
Now, I know that I'm not the sharpest tool in the shed, so, what other points, pro or con, am I missing here?
If the eVENT 'Uni' is not appropriate for use in these conditions, what about the ID Sola (ok...difficult to get into) and/or MegaSola (a bit on the heavy side for what you get)? [too bad both of these can't be considered bivies, & then made of eVENT to save a bit of wt - prob a 6oz to 12oz "guesstimate", based upon a loose cp. b/t the Unishelter & the eVENT Unishelter.]
I'd be interested in knowing more. Anyone care to enlighten me on any/all of these questions/issues, please?
[Note: These questions are not intended to "question" the four choices in a recent BPL on-line Review Ariticle. They are just for my own information.]