The U.S. weather station observation database.
This database is currently being developed. When complete, you will be able to access a U.S. based METAR station data by using the URL.
The {icao} is replaced with a valid ICAO station id.
Example, weather for San Francisco...
http://www.metar.us?icao/KSFO will return the current metar report.
Future development will allow you to query english translations and history data.