Morning commuters were met with a soggy start to their day Thursday as heavy rain poured down across the region, requiring some drivers to navigate flooded roads and dodge water pockets.

"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."

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,