First, it should be noted that one of the tenants of the LDS is stockpiling goods for the community in the event of disaster and hardship. This is a practice that evolved out of their flight west and the persecution that necessitated it. However, these pantries have never, at least in any widespread way, been used to prepare for the Last Days. Until now.
This is due primarily to Julie Rowe’s books A Greater Tomorrow: My Journey Beyond the Veil and The Time Is Now which are based on a near death experience she claims to have in 2004. In these books she warns her readers of a imminent upheaval in society.
Apparently her books have been so popular that "officials with The Church of Jesus Christ of Latter-day Saints sent a memo to administrators and teachers in the Church Educational System, saying, that although Sister Rowe is an active member of the LDS Church, 'her book is not endorsed by the church and should not be recommended to students or used as a resource in teaching them. The experiences … do not necessarily reflect church doctrine or they may distort doctrine.'"
And in an effort to invalidate they have, in a way, validated her work since, of course, the powers that be would say that.
Her detractors are quick to point out that her work reads like a mix of the typical right wing paranoid conspiracy theories found in abundance on the internet and a handful of LDS tracts.
While I have not read her work, I do note that based on quotes and synopses they seem to be part of trend found across the spectrum of American fringe, and occasionally not so fringe, groups. These works are more reflective of a tension found in a shifting society than anything else.
Apocalyptic literature has been around in one form or another since at least the days of Zoraster, around 3000 years depending on who you ask, and it doesn't appear to be going anywhere.