This is a link to the National Climatic Data Center. There is an amazing amount of climatilogical data from the U.S. and around the world on this site including averages, extremes, and observed data for thousands of towns.
This links to current and archived rainfall data for Texas and the nation.
This links to the daily national weathermaps from 1871 to the present!
This links to a variety of the numerical models that professional forecasters utilize as well as a variety of satellite and radar imagery.
This is perhaps the best one stop site for observed data, radar and satellite imagery as well as forecast models, upper air observations, and links to a number of forecast centers including the Storm Prediction Center and the Tropical Prediction Center
Thank you for checking out these sights...Heatwave.