The National Weather Service issued a flood warning through 9:45 a.m. Tuesday morning for the entire Bay Area.
Doppler radar began documenting heavy rain about 6:30 a.m., indicating a greater chance for urban and stream flooding in all of the nine Bay Area counties, according to the NWS website.
In addition, the NWS showed that San Francisco's rainfall surpassed 100 percent of normal. So far this year, 11.52 inches of rain fell on the downtown area starting from Oct. 1, 2015 to Jan. 18. Last year, 14.45 inches fell during the same time period.