Nature2013-2016US West Coast (California to Alaska)high confidence

A toxic algal bloom stretched along the entire West Coast of the United States during the Pacific 'Blob' period.

Notes on verification

Confirmed by multiple independent authoritative sources including NOAA, University of Washington, and Hakai Magazine, describing the unprecedented scale of the toxic algal bloom during the 'Blob' marine heatwave. [tier=silver indep_score=0.693 clusters=5 claim_tier=notable]

Sources