I have used
http://weather.unisys.com/ for several years now and switch between the medium range GFSx/MRF forecast model which goes out to 10 days and the nested grid model, the NAM model. Both are found under Forecasts on the lhs of the page. However if you are working with these numerical models and do not like them, there is the ECMWF, European model. But I use these models regularly with quite good success and if you are a meteorologist and are not finding these models to be quite excellent today I really don't know what to say. Perhaps you are a layman and using text forecasts that are not quite taylored to your specific needs and are therefore encountering discrepancies. Bottom line - I can't really address your question because I don't know your background and degree of competence with these more sophisticated numerical products on line today.
I am a retired research meteorologist, Ph.D, with some 45+ years experience.