A powerful storm system was expected to reach San Diego County overnight Thursday, bringing even more rain, wind, snow and a higher potential for flooding than its predecessor. The heaviest showers were expected overnight,

"This system is expected to be quite cold aloft which increases the chances of thunderstorms across the area, leading to an increased threat of flooding."

Back-to-back storms are expected to bring San Diego County rain clouds, gray skies and precipitation for much of the week.