Check out these Google sites for Cassiodorus, strange weather. I first became aware of this information from a book on boloid impact effects.
Those are some nice hits, included this old topic (long forgotten by me):
http://www.freerepublic.com/focus/news/1662473/posts
Catastrophe:
A Quest for the Origins
of the Modern World
by David KeysExodus to Arthur:
Catastrophic Encounters
with Comets
by Mike Baillie