Forecasting Links, Top to Bottom
Teleconnections (PNA, NAO, etc.):
http://www.cdc.noaa.gov/map/wx/indices.shtml
http://www.cpc.noaa.gov/products/precip/CWlink/daily_ao_index/teleconnections.shtml
Satellite Data (Canada):
http://www.weatheroffice.gc.ca/satellite/index_e.html (EC satellite)
http://www.theweathernetwork.com/satradarmaps/ (Weather Network)
Satellite Data (USA):
http://www.intellicast.com/National/Satellite/Default.aspx
http://www.rap.ucar.edu/weather/satellite/
http://www.weather.gov/sat_tab.php?image=ir
http://www.ssec.wisc.edu/datacenter/
Radar Data (Canada):
http://www.weatheroffice.gc.ca/radar/index_e.html (EC radar)
http://www.radar.mcgill.ca/real_time.html (McGill Radar)
Radar Data (USA):
http://www.intellicast.com/National/Radar/Default.aspx
http://www.wunderground.com/radar/map.asp
http://www.ral.ucar.edu/weather/radar/
http://www.weather.com/maps/maptype/dopplerradarusnational/usdopplerradar_large.html (Weather Channel)
Upper-air Analyses and Soundings:
http://www.rap.ucar.edu/weather/upper/
http://weather.uwyo.edu/upperair/
http://weather.unisys.com/upper_air/index.html
http://weather.cod.edu/analysis/analysis.upr.html
http://weather.noaa.gov/fax/nwsfax.html (NWS fax charts)
http://www.weatheroffice.gc.ca/analysis/index_e.html (EC analyses)
Surface Data and Analyses:
http://www.rap.ucar.edu/weather/surface/
http://www.hpc.ncep.noaa.gov/html/sfc2.shtml
http://weather.unisys.com/surface/index.html
http://weather.noaa.gov/fax/nwsfax.html (NWS fax charts)
http://www.weatheroffice.gc.ca/analysis/index_e.html (EC analyses)
Numerical Models (Graphical):
http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/ (Best site for NAM: 12 km, 84 hrs; GFS: 32 km, 15 days; HWRF: 4km, 48 hrs)
http://www.rap.ucar.edu/weather/model/ (NAM/GFS alternate)
http://weather.unisys.com/nam/index.html (NAM alternate)
http://weather.unisys.com/gfs/index.html (GFS alternate)
http://www.atmos.albany.edu/student/tomjr/weather_links/qg_diagnostics.htm (Real-time GFS forecasts using QG diagnostics)
http://www.weatheroffice.gc.ca/model_forecast/index_e.html ( EC GEM Regional: 15 km, 48 hrs)
http://www.weatheroffice.gc.ca/model_forecast/global_e.html (EC GEM Global: 35 km, 144 hrs)
http://meteocentre.com/models/modelsgem_e.html (EC GEM alternate)
http://ruc.noaa.gov/pig.cgi?20km_RUC (RUC short-term: 13 km, 12 hrs)
http://weather.uwyo.edu/models/fcst/ukmet.html (UKMET: 30 km, 72 hrs)
http://meteocentre.com/models/modelsukmet_e.html (UKMET alternate)
https://www.fnmoc.navy.mil/wxmap_cgi/index.html (Navy NOGAPS)
http://www.ecmwf.int/products/forecasts/d/charts/medium/deterministic/msl_uv850_z500!Geopotential%20500%20hPa!72!North%20America!pop!od!oper!public_plots!2008103012!!/ (ECMWF Medium Range: 240 hrs)
http://meteocentre.com/models/modelscep_e.html (ECMWF alternate)
Ensemble Numerical Models (Graphical):
http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/ (GFS ensemble: GEFS; NAM ensemble: SREF)
http://www.emc.ncep.noaa.gov/gmb/ens/ (GEFS alternate)
http://www.emc.ncep.noaa.gov/mmb/SREF/SREF.html (SREF alternate)
http://www.weatheroffice.gc.ca/ensemble/index_e.html (GEM ensemble)
Numerical Models (Text Output):
http://leonardo.met.tamu.edu/Weather_Interface/ (MOS and extrapolated model text data)
http://www.weather.gov/mdl/synop/products.php (MOS alternate)
http://weather.uwyo.edu/models/mos/mos.html (MOS alternate
Mesoscale Numerical Models (Graphical):
http://cheget.msrc.sunysb.edu/html/alt_mm5.cgi (SUNY-Stony Brook MM5, good for eastern half of US)
http://www.atmos.washington.edu/mm5rt/ (University of Washington WRF and MM5, good for western half of US)
Human Forecasts (Canada):
http://www.weatheroffice.gc.ca/canada_e.html (Environment Canada)
http://www.theweathernetwork.com/ (Weather Network)
Human Forecasts (USA):
http://www.hpc.ncep.noaa.gov/ (Graphical forecasts up to 7 days + forecast discussions)
http://www.nws.noaa.gov/ (Links to any NWS local office)
http://www.wunderground.com/ (NWS forecasts for anywhere in U.S.)
http://www.weather.com/ (Weather Channel)
http://www.intellicast.com/ (Intellicast)
Severe Convection Forecasting:
http://www.spc.noaa.gov/ (NOAA Storm Prediction Center)
http://www.stormchaser.niu.edu/machine/fcstsound.html (Forecast soundings)
Tropical Forecasting:
http://www.nhc.noaa.gov (National Hurricane Center)
http://metocph.nmci.navy.mil/jtwc.php (Joint Typhoon Warning Center for Western Pacific and Indian ocean cyclones)
http://cimss.ssec.wisc.edu/tropic/tropic.html (Good satellite data, etc.)
http://moe.met.fsu.edu/tcgengifs/ (Tropical cyclone forecasting models)
International Weather Organizations
http://www.meteo.fr/meteonet_en/index.htm (Meteo-France)
http://www.metoffice.gov.uk/ (UK Met Office)
http://www.bom.gov.au/ (Australian Bureau of Meteorology)
http://www.jma.go.jp/jma/indexe.html (Japan Meteorological Agency)
http://web.kma.go.kr/eng/index.jsp (Korean Meteorological Agency)
http://smn.cna.gob.mx/SMN.html (Mexico Meteorological Service)
http://www.wetterzentrale.de/ (German site with lots of Europe-centric weather info)