Weather Blog Brilliant Bloom in the Baltic Sea An explosion in the numbers of cyanobacteria transformed the Baltic Sea into a swirling canvas of green in summer 2025. Read More… About Author OTW Observer See author's posts Post navigation Previous Whirling Dust and Ancient FloodsNext A BIG Moment for Apollo 11 Related Stories Tropical Storm Arthur Weather Blog Tropical Storm Arthur June 19, 2026 Desert Field Test With NASA Advanced Rover Prototype Weather Blog Desert Field Test With NASA Advanced Rover Prototype June 18, 2026 El Niño Is Underway Weather Blog El Niño Is Underway June 18, 2026