This is probably pretty exagerated. I live in Cali and more Places here are either pretty high elevation or completely unflat ground. Most homes in CA simply could not be flooded because they are on hills and they ones that arnt are in huge flat planes that are at least 400ft above sea level. There are only a few valleys and they are probably the only places that really might need to worry.
But hey if they didnt exagerate they would make less ad revenue.
If the rain storm is as big as they are saying, it will flood the entire central valley. There is an enormous population that lives here and massive amounts of food come out of here. This would make the flood back in 1997 look like a pool party. You will all be missing us when the food prices go through the roof.