A new prescribed burn, called Palomar Mountain Piles Wcsl, was initiated 12:10 p.m. Jan. 8 in San Diego County. The prescribed fire has been burning on federal land managed by the United States Forest Service for more than a month.

Forecasters warned Monday that a powerful storm system is approaching San Diego County that could trigger flooding and debris flows, particularly in recent burn areas.

There is up to a 15% chance of light precipitation on Tuesday as the marine layer deepens from coastal to foothill areas throughout the county, with the heavier rain arriving later in the week, forecasters said.