CSC DUATS: www.duats.com
This is the site for Web-based preflight briefings. File and change flight plans online. It also includes basic flight planning and weather graphics—including current conditions, NEXRAD radar, satellite imagery and aviation forecasts. It also offers TFRs and NOTAMs, available in both text and graphic form.
NOAA National Weather Service Aviation Weather Center: aviationweather.gov
It’s the official source for aviation weather. It includes AIRMETS, SIGMETS (domestic and international), prognostic charts, PIREPs, surface observations, RADAR and satellite imagery—all free of charge. New products include icing and turbulence forecasts. It also has links to an Aviation Digital Data Service (ADDS) experimental site with products including combination radar intensity and cloud tops chart, graphical METARS, TAFS and PIREPs, convective forecasts and more.
NOAA NWS AWC Aviation Digital Data Service: www.aviationweather.gov/adds
It’s one of the best, aviation weather sites, offering text, digital and graphical forecasts, and weather analyses. It’s a joint effort of NCAR Research Applications Program (RAP), NOAA Forecast Systems Laboratory (FSL) and the National Centers for Environmental Prediction (NCEP) Aviation Weather Center (AWC).