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HAB Forecasts

The Pacific Northwest HAB Bulletin (PNW HAB) provides an early warning of HABs to coastal shellfish managers. Data for the PNW HAB Bulletin, including abundance of the toxic diatom, Pseudo-nitzschia (PN) and the toxin, particulate domoic acid (pDA), are collected by ship from HAB hotspots, the Juan de Fuca Eddy and Heceta Bank (see figure above), at beaches in Washington and Oregon, and from coastal moorings. The direction of Pseudo-nitzschia transport from the HAB hotspots to beaches depends upon coastal winds that promote upwelling or downwelling. Models will provide information about the location and intensity of the Columbia River plume (see figure above) that can act as a barrier or facilitator for HAB transport to beaches. These Bulletins will allow coastal managers to better protect shellfish safety in the communities by opening selective beaches, collecting additional shellfish samples (Dungeness crab, clams, and mussels) for testing when needed, and providing advanced notice of HABs to the public.