AccuWeather.com
Offers current local conditions, 5-day, 10-day, 15-day and extended weather forecasts plus weather maps, doppler radar, and historical weather information.
CNN.com - Weather - Lewisville, TX
Five day forecast, radar, satellite, current conditions, news and weather links.
The Weather Channel - Lewisville, Texas
Provides current conditions, radar, weather map, ten day forecast, and links to news.