The Bay Area continued to see the effects of an atmospheric river soaking the region on Tuesday, and it doesn’t stand to let up until the new year comes, authorities and forecasters said.

A flood watch was issued for the greater Bay Area for much of Tuesday, with predictions of 2 to 4 inches of rain for coastal ranges, 2 to 3 inches for interior area, and between 1.5 and 2 inches for the region’s valleys, according to the National Weather Service.

The flood watch declaration took effect at 1 a.m. Tuesday and lasts until at least 6 p.m. A flood advisory, which is less severe, has been issued for more inland areas and lasts until at least 2 p.m.

This storm moved in from Guam and matches the characteristics of a “Pineapple Express,” in which rain and winds — predicted to reach up to 60 mph — will spare the area from freezing, keeping a relatively moderate range spanning temperatures in the low 40s and upper 50s.

The Weather Service said that heavy rain was reported throughout the region Tuesday morning, ranging between 1 and 2 inches overnight, with 1 and 1.5 inches more expected through the morning.

San Jose and the surrounding region, coastal cities in San Mateo and Santa Cruz counties, and San Francisco were expected to see some flooding. Low-lying and poor drainage areas stand to experience the most impact, NWS forecasters wrote in a morning bulletin.

Traffic delays were not widespread early in the Tuesday-morning commute, though that was likely influenced by lower overall commute volume typically seen between Christmas and New Year’s Day.


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