A Pacific storm that was expected to drop about 1.5 inches of rain along the San Diego County coastline has produced more than twice that much and will continue to wash across the region until Friday night, according to the National Weather Service.

The system arrived in force on Sunday and was supposed to be gone by Wednesday night or Thursday at the latest.

“But it’s been sitting and spitting over us all week”, said Miguel Miller, a weather service forecaster “The models have it moving out pretty quickly on Friday night.”

San Diego International Airport unexpectedly received about 1.50 inches of rain overnight. By 6 a.m. Friday, the airport’s seasonal rainfall total had hit 12.54 inches, more than three inches above average.