There's a couple of surprises here.
First, Strieber and Bell did an excellent job in the book, which was called
The Coming Global Superstorm. They cited a number of scientific authorities with accuracy, and kept the New Age speculations separate. Just the names alone would not please a Skeptic, but on its own merits, the book was a decent piece of lay scientific writing, and Strieber interleaved a story that became the foundation of the movie.
Superstorms
do happen. One that you probably remember hit the entire Eastern third of North America during March, 1993. This storm eventually formed a low-pressure trough that stretched from the Gulf of Mexico across the pole and down to the Mediterranean sea! This is also the storm pattern reconstructed from research on Heinrich Events, the episodes that occur with major climate changes.
The story about -150F downdrafts is quite correct, and has been observed a few times. The air comes from the stratosphere, however. Over the past decade, the stratosphere has been cooling dramatically. It used to be -50F, but now it really closer to -150F in the winter. This is creating a relative temperature inversion. Big downdrafts, which actually happen in thunderstorms and hurricanes, can easily bring frigidly cold air to the surface. I'm sure it's magnified and hyped in the movie, but it's based on known phenomena.
A number of critters have been found flash-frozen, and the downdraft hypothesis is better than most of the other contenders -- not just the Berezkova mamoth, but it analysis of cellular damage determined that Ötzi (the Ice man) was frozen more quickly than a dying man would have been expected to freeze in a snowstorm. The difference between a sci-fi downdraft and a blizzard at that point is negligable -- Ötzi picked a bad day to go for a walk!
I haven't seen the movie yet -- probably Tuesday or Wednesday -- but I'm very familiar with this topic. My interest was first piqued around 1978 when I read an article on Wallace Broecker, a climatologist at Lamont-Doherty (Columbia U). He was warning that an ice age could start in less than a decade based on just the current disruptions he saw in the 1970s, a full two decades before the big northern Gulf Stream current breakdown began a few years ago.
I do think that they stretched it with shutting the whole Gulf Stream down in three days, though. It would take longer than that, but the real mechanism isn't the Gulf Stream
per se -- it's the Thermohaline Circulation, which runs roughly opposite to the Gulf Stream. Either way, if you stretch the movie's time frame into five or ten or maybe even twenty years, it should make more sense.
Sorry to run on so long. It's not often that a major movie is made about one's pet ideas! Like most people who pay attention to scientific happenings and advance their own predictions, I've been vindicated by a few things here and there, but this one is especially nice.
--bkl
Pack your long johns.