If you have an Internet connection, you can have FlightMath automatically download Terminal Area Forecast (TAF) information as reported by NOAA (National Oceanic and Atmospheric Administration) for any airport that has an ICAO code and generates TAF data. Simply type in the four-letter code in the text area labeled "ICAO Identifier" and click on "Get TAF". If the download was successful, the information for the airport will be filled in. You can either have FlightMath decode the TAF by selecting Decoded from the Display menu, or you can view the normal coded TAF by selecting Encoded.
What is an ICAO code?
Four-letter ICAO codes have been assigned to many airports all over the world. In the United States, the ICAO code is obtained by taking the normal
airport code and appending a "K" in front of it. For instance, Phoenix Skyharbor is PHX, and its ICAO code is KPHX. International codes can be different, however,
and if you need to look it up, you may find it here.