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Cool, wet, cloudy weather with higher-than-normal river flows. Spectacular river plumes, suspended sediment and wind extend far into the waterways. Surface debris abundant. The freshwater layer in Whidbey Basin increased by 2 m matching high precipitation.

Warm, sunny weather and higher-than-normal river flows . The freshwater layer in Whidbey Basin increased by 2 m. Abundant surface debris and algae blooms in river-fed inlets in South and Central Sound. Puyallup plume extends into Quartermaster Harbor. New thermosalinograph installed on ferry.

Warm, sunny weather with higher-than-normal river flows. Temperatures above 13 °C . Strong algal blooms South Sound and Central Basin and most smaller bays. Dissolved oxygen levels in surface waters decrease despite high algae production. Abundant debris lines. Oil sheen in Lake Union.

Cool weather and river flows above normal. A bonanza of red-orange Noctiluca streaks in Central Basin with reduced fluorescence south of Edmonds. Strong red-brown bloom in Case Inlet. Higher DO levels in Whidbey Basin surface water. Oil sheen in Sinclair Inlet.

In the south a persistent marine layer over the lowlands keep conditions cooler. River flows are high. Water temperatures approach 15 °C. High fluorescence in the Main Basin Extensive red-brown blooms in South Sound. In Whidbey Basin, higher DO and algal bloom in surface waters.

Temperatures in Main Basin drop below 15 °C. Marco algae in Central Sound. Red-brown blooms in South Sound Inlets and parts of Central Sound. Jellyfish patches increasing in size in Sinclair and Budd Inlets. Low-Moderate fluorescence and turbidity in Main Basin and Admiralty Inlet.

River flows are below normal. Temperatures in Puget Sound are 12-14 °C. Extensive red-brown blooms in Inlets of South and Central Sound. Jellyfish are increasing in numbers. Low-moderate fluorescence in Central Sound. In Possession Sound dissolved oxygen decreased by 1.1 mg/L.

Low to moderate fluorescence in northern Puget Sound. Red-brown blooms, and large jellyfish aggregations in the inlets of South and Central Sound. Dry weather and decreased thickness of the freshwater layer in Possession Sound.

Temperatures range from 9-11°C. Red-brown blooms and jellyfish continue in terminal inlets. Low fluorescence throughout Central Sound and Admiralty Inlet. Since 2011 much colder and much fresher and oxygen levels are up.