Animation of the water content of the atmosphere over the eastern Pacific Ocean. The colour-coding represents total precipitable water, the amount of water that can be obtained from the surface to the top of the atmosphere, if all of the water and water vapor were condensed to a liquid phase. Red indicates the highest levels of water, through yellow, green and cyan to dark blue (least water). The equator has near-permanently high levels of water due to evaporation caused by intense solar heating. Air currents transport moisture across the globe, in features called atmospheric rivers. One of the most notable of these is the Pineapple Express , which brings moist air from the ocean near Hawai'i to the west coast of North America. These data are from NOAA's Science On a Sphere, and were gathered by two instruments: the Advanced Microwave Sounding Unit, AMSU, on board the Polar Environmental Orbiting Satellites NOAA 15, NOAA 16, and NOAA 17, and the Special Sensor Microwave Imager, SSM I, on board the Defense Meteorological Satellite Program satellites. Both are provided in near real-time. The AMSU dataset is updated hourly and the AMSU SSMI combined dataset is updated daily. |