San Francisco Bay’s toxic algae bloom is suddenly back. How bad will it get?

San Francisco Baykeeper received a tip on its hotline Thursday of a possible algae bloom and sent out a drone Friday that captured footage of a red tide spreading between Albany and Emeryville, said Rosenfield. 

Water samples of the bloom contain a large number of Heterosigma akashiwo cells, the same type of algae that devastated the bay last summer.