Omaha-Offutt AMS Forecast Contest

Below are links to some useful pages with forecast model and observation data. This is by no means meant to be an exhuastive list of links!

UCAR RAP Real-Time Weather Data has surface and upper air observations, along with forecast graphics.
Texas A&M Weather Interface provides links to numerical model output.
Weather Underground is another excellent data source, not only for model output but local observations, as well as climate data.
UNISYS Weather Data includes links to a number of model graphics.
Storm Prediction Center issues severe weather outlooks for the next 8 days.
HPC NCEP (NOAA) is another great source of forecast data graphics.
The Weather Channel has plenty of information for the US.
Hourly Weather Graph for Omaha, NE, from the National Weather Service.