A wind-driven wildfire charred dozens of acres in the sparsely developed northeastern reaches of San Diego County, damaging structures and forcing pre-dawn evacuations before crews could gain the upper hand on the flames Wednesday.

Scores of residents were urged to flee as fast-moving fires hurtled through bone-dry brush in Bonsall and Mission Valley Tuesday

A rare Particularly Dangerous Situation warning has been issued for Southern California as a powerful and potentially damaging Santa Ana wind event​ is expected.