Accuweather.com
5-day weather forecasts for the United States in a nice, easy to read format, AND the 1- to 3-day out accuracy of other weather forecasters (Accuweather, The Weather Channel, MyForecast.com, Intellicast, and the National Weather Service) including links to their forecasts.
La Crosse Technology
Informacion meteorologica para pilotos en Chile
Monitoreo del clima en mexico, imagenes de radares, imagenes de satelite GOES, sistemas tropicales y sus posibles trayectorias, pronostico del tiempo.