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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.

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.

During June, near normal air temperatures and continued low precipitation have resulted in highly variable freshwater inputs to Puget Sound. A large Noctiluca bloom extends across the South Central Basin of Puget Sound. Coccolithophores are blooming in Hood Canal. Macroalgae is drifting as mats on the water in Port Madison, South Central Basin, and South Sound. They are also piling up on beaches in South and Central Puget Sound and Whidbey Basin. Juvenile fish are migrating out of the estuaries and meeting a complex thermal habitat. New infrared images tell the story. Meet our ocean acidification expert, Stephen Gonski.

Summer is here! Surface water temperatures have warmed to 14-15 °C. Widespread algae bloom in Main Basin. Puyallup River discharge is very large. Extensive phytoplankton blooms in Central and South Sound, large patches and strands of macroalgae in South Sound/southern Central Sound.

Little sunshine, cold air temperatures, and higher river flows. Freshwater plumes extend far into the waterways. Chilly surface temperatures in Central Sound. First blooms begin in South Sound. A thinner freshwater layer at Mukilteo suggests a low discharge of the Snohomish river.

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.

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.

Large blooms in South Sound and Main Basin with abundant macro-algae. Very complex surface water masses that meet at a triple point in Main Basin. Widespread algae bloom in Main Basin; surface water temperatures warmed in the last few days to 13-14 °C. Dissolved oxygen levels remain high.

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.

Cloudy, slightly warmer-than-average air temperatures, and higher-than normal river flows. Freshwater plumes extend far into the waterways. Jellyfish from fall still persist in Budd Inlet. Chilly surface temperatures and pulses of high CDOM waters in Central Sound.