Here are numerous links that you may find useful. If you have others to share, please send.
NOAA/NCEP:
NCAR RAP: http://www.ral.ucar.edu/weather/
coolwx.com:
FSU:
PSU
Univ. at Albany: http://www.atmos.albany.edu/index.php?d=wx_data
Univ. Wisconsin: http://www.ssec.wisc.edu/data/geo/
College of DuPage: http://weather.cod.edu/
Univ. South Alabama: http://www.southalabama.edu/meteorologyclub/synoptic/
WeatherUnderGround: http://www.wunderground.com/
Kean University: