The National Data Buoy Center, administered by the National Oceanic and Atmospheric Administration and National Weather Service, collects and shares weather data from its buoys and coastal weather stations deployed across the globe.
Data available at this resource include:
The National Data Buoy Center also offers a Dial-a-Buoy service for people needing weather information by phone.
Earth from nullschool.net displays a striking interactive visualization of near-real-time global weather conditions forecast by supercomputers. The data at this resource includes:
Consult the about page for more information on how to use this tool.
The Worldview app from NASA's Earth Observing System Data and Information System (EOSDIS) provides the capability to interactively browse over 900 global, full-resolution satellite imagery layers and access the underlying data. Many of the imagery layers are updated daily and are available within three hours of observation - essentially showing the entire Earth as it looks "right now". This supports time-critical application areas such as wildfire management, air quality measurements, and flood monitoring.