Here are several links to both real-time and archived MET data and products on the web....

WX ANALYSES AND MODEL FORECASTS (AND OFTEN MORE PRODUCTS)

http://www.ametsoc.org/amsedu/dstreme/ AMS Data Streme Project

http://weather.uwyo.edu/ Wyoming Wx Web (Difax Charts)

http://www.rap.ucar.edu/weather/ Charts, Sat Imagery, Sndgs, Surface, Radar, Forecasts

http://www.hpc.ncep.noaa.gov/html/sfc2.shtml HPC North American SFC maps

http://weather.unisys.com/upper_air/index.html UNISYS upper air charts and data, archives, forecasts

http://vortex.plymouth.edu/ Plymouth State Wx center - real-time and archived data available plus many other MET resources

REAL-TIME SURFACE OBSERVATIONS

http://web.live.weatherbug.com/ AWS WeatherBug Live Obs

and cameras

http://weather.noaa.gov/weather/current/XXXX.html Current/24 hr sfc obs for any station (replace XXX w/ station ID ex Annapolis KNAK

http://weather.noaa.gov/ Obs for anywhere (sfc, aviation)

SOUNDING DATA

http://twister.sbs.ohio-state.edu/skewt.html Skew Ts / Soundings

http://www.rap.ucar.edu/weather/upper/

http://weather.unisys.com/upper_air/skew/index.html

NWS/NOAA SITES

http://www.ncep.noaa.gov/ NCEP

http://www.ncdc.noaa.gov/oa/ncdc.html NCDC

http://aviationweather.gov/ aviation weather specific

http://www.erh.noaa.gov/er/lwx/ NWS Sterling VA - Wx for the DC area

WX LINKS FOR EVERYONE

http://www.intellicast.com/ Great Graphics

http://www.weather.com/

http://asp.usatoday.com/weather/weatherfront.aspx

SATELLITE IMAGERY

http://www.cira.colostate.edu/special/currwx/currwx.htm CO State Sat Imagery

http://www.ssec.wisc.edu/ U-Wisc/Madison Sat Imagery

MILITARY METOC CENTERS REAL-TIME DATA and MIL OPS PRODUCTS

https://www.fnmoc.navy.mil/ Fleet Numerical MET and OC Center

https://www.navo.navy.mil/ Naval Oceanographic Office

https://www.nlmoc.navy.mil/home1.html Naval Atlantic MET and OC Center