Careful what we wish for:
http://www.wunderground.com/blog/weatherhistorian/californias-superstorm-the-usgs-arkstorm-report-and-the-great-flood-
10 feet of water in Sacramento, as well as the surrounding valleys... Mostly long forgotten, but my BIL brought it up last weekend.
Limits? Don't know there are any, no more than there are limits to tornadoes or earthquakes...
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