Public works crews in Pacifica are closing streets and filling potholes along the city's waterfront where an angry Pacific Ocean could produce giant swells up to 20 feet during the weekend's storms.
"We're getting 1.5 inches of rain this weekend through Sunday. That's a short amount of time and that's among my concerns," explained Raymond Biagini with Pacifica's Public Works Department.
PHOTOS: Rain, storms hit Bay Area during 2016 El Nino season
The rain arrived early, bringing some neighborhood flooding with it. The predicted heavy winds and cliff erosion also have officials concerned.
It's a race against time for construction crew, which recently demolished a red-tagged cliffside apartment building on Esplanade Avenue. And work isn't done yet.
Max Jones and his son, Jamison, are monitoring this crumbling cliff off Pametto Avenue, which appears to be eroding.
"Today, tomorrow, Sunday, the whole thing could be gone by then," said Jamison.
The cliff is off limits and several homes around it have been red-tagged.
"Ten years ago, we had a lot more shoreline, it's being reclaimed," said Max.
Construction crews are fighting erosion by shoring up this stretch of waterfront with dirt and rock as a little insurance against El Nino.
"We're helping people protect their property and prevent Mother Nature from doing its thing," said Ray Kurttioa, a construction worker.
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Rainfall so far today. Several inches expected this weekend for the hills & 1-3" for lower elevations. pic.twitter.com/tVMqIzPvtp— Sandhya Patel (@SandhyaABC7) March 5, 2016