The NWS had been predicting rain all day yesterday and today.
I knew the instant I stepped outside this morning that it would be a while before we got any precipitation.
Weather rule #1: If the wind is calm, the weather won't change for a while.
Sure enough, it has yet to start raining. However, the wind is now coming out of the south, and is quite strong. Southerly winds in So Cal almost always mean a storm is approaching. (Westerly winds are normal in So Cal, easterly winds mean hot and dry weather)