Big rain storms a bust — so far — for Southern California

We got the dark clouds, but not much water. What happened, Southern California?
Expectations of enough rain to warrant flash-flood and debris-flow warnings in areas recently scorched by brush fires did not pan out by Wednesday evening, and forecasters now say that if rain hasn’t hit by Thursday night, then the weather will be mostly dry the next 10 days.
And if we do get rain this week, it’s expected to be light to moderate.
Blame it on a slower-than-average Pacific cold front coming