North American umber prices fell for the fifth consecutive day on Friday, May 14.  After soaring more than 250% last month, lumber spot prices dropped to around $1,550 per thousand board feet last Friday, down from $1,686 the week before. Lumber futures also eased, dipping from a record high of $1,670.50 to around $1,400 per thousand board feet.  Consequentially, lumber stocks are experiencing a mild sell-off. Shares of West Fraser Timber were down approximately 9% this past week, while shares of Weyerhaeuser and Canfor were down 3% and 5%, respectively ...