As long as I have lived in OC, I don't recall ever hearing of Tornados here. According to the news, the rainfall is supposed to reach "biblical proportions" and after today I tend to believe it as I experienced another first in OC… hail.
There have been scattered reports of funnels forming here and there but none quite taking any deep roots yet, though there has still been some damage (see video below).
What I do find fascinating is that the search trends for tornadoes and weather in OC is very high right now, 11 out of 20 of the top trends is relating to this out-of-place weather we are experiencing here. I took a screenshot for posterity.
Huntington Beach Pier January 19th, 2010