"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.

A late-winter storm brought widespread showers to the San Diego area, dropping modest amounts of moisture, and another round of rain is on the way Wednesday.

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,