I love how two people just called creationists liers back to back ...
Anyways, jasonkthompson, you just asked a probably grey-zone area question in science. And any serious answer should say that there is no definite answer to your question, only hints of probable explanations. (Meteorology is much more complicated then it sounds. Especially in long term climat change.)
A biblical flood, however, would most probably cause an ice age as you mentioned. This does not mean that it is the only way this can be obtained.
And in case it isn't clear, I'm creationist.