Weather

Ace's Pilot Shop Weather Data - Aviation weather and flight planning, including forecasts, observations, weather maps, DUATS briefings, icing, and turbulence.

Airwx Mobile - Get METARs, TAFs, PIREPs, and weather charts on your mobile phone (and iPhone).

Aviation Weather - Displays live pilot reports, current and forecast weather (PIREPs, METARs, TAFs), temporary flight restrictions (TFRs) with optional radar overlays using Google maps.

Aviation Weather Center - The National Weather Service's aviation weather site with official forecast products as well as experimental products.

BalloonCast - Customized weather for balloon pilots. METARs, TAFs, winds aloft, sunrise/set for multiple stations compared side by side, all codes translated to English and times converted to local.

Data Transformation Corp DUAT - FAA's Direct User Access Terminal service provides free aviation weather and flight planning for certified pilots in the US.

Flying in Europe - Weather information for flying in Europe, including all airport notams, calculations, country information, airport webcams, FBO database, and all aviation abbreviations.

METAR and TAF Archive - Archive of current and historical METAR and TAF reports for airports worldwide.

Meteo Mobile - Metar, Taf, satellite images, airport maps and nearby POI's delivered via mobile phone.

Pilot Weather Briefing - Free weather information for pilots, including surface conditions, upper level winds, turbulence, icing, thunderstorms, TAFs and Metars, radar and satellite images.