National Oceanic and Atmospheric Administration: NOAA. Pages include weather forecasts, warnings, and meteorological products for forecasting the weather.
Office of Marine and Aviation Operations: The OMAO fleet supports a wide range of marine activities, including fisheries research, nautical charting/mapping, and long-range ocean and climate studies.
Soaring Weather Reports: Kevin Ford provides a Thermal Index Report Generator, instructions how to use it and the source code.