I saw this over in the Texas section on Cycle Forums and thought it was a pretty good link.
Link 1 - National Weather Service Forecast
Link 2 - Meteorological Products Processed At The NWSTG
Here is another link that somoene posted which has the search utility for the weather reporting stations.
Link 1 - National Weather Service Forecast
Link 2 - Meteorological Products Processed At The NWSTG
Great Weather Forcast Tool
Attached is a link to a progam that a pilot friend put together to make looking for weather focasts a little easier.
The only limitation to using the program is that you need to know the ICO identifier for the nearest airport. Below are the identifiers for airports near the 4 most commonly visited racetracks.
KFTS - Fort Worth - Cresson (Motor Sports Ranch)
KTXK - Texarkana - Henderson (Oak Hill)
KTUL - Tulsa, OK - (Hallett)
KCLL - Easterwood - College Station (TWS)
Link 1 above: http://www.rvproject.com/wx/ndfd.jsp
For Austin you can use KAUS or KGTU and for San Antonio you can use KSAT or whatever airport is closest to you.
Here is another link that somoene posted which has the search utility for the weather reporting stations.
And for anyone who wants to look up other locations :
Link 2 above: http://www.nws.noaa.gov/tg/siteloc.shtml
You can just choose to display all stations in a state and that will give you a city list with the codes.