The Weather Channel
The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage.
AccuWeather
AccuWeather has local and international weather forecasts from the most accurate weather forecasting technology featuring up to the minute weather reports.
National Weather Service (NWS) - NOAA
NWS provides weather, water, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas.
FAA - Airport Flight Delay Information
The FAA Flight Delay Information website indicates general airport conditions at US airports; it is not flight specific.