Formerly known as the Weather Underground API and soon to be renamed The WeatherAPI. Launched in 2011, the WeatherAPI was the first weather API available in a self-serve portal in the world. In 4 years it has amassed over 300,000 key sign ups and generated annual revenue in the millions. It is now the most used weather API in the world.
I planned and launched the V1 of the portal at TechCrunch Disrupt SF in 2011. I have since managed the positioning, development, and ongoing promotion of the WeatherAPI.