U.S. National Weather Service   http://www.srh.noaa.gov/

Europe   http://www.metoffice.com/weather/charts/animation.html

Hurricanes  http://www.nhc.noaa.gov/index_special.html

Typhoons  http://www.npmoc.navy.mil/jtwc.html

Tornadoes  http://www.tornadoproject.com/

Drought http://www.cpc.ncep.noaa.gov/products/expert_assessment/drought_assessment.html

Earthquakes  http://neic.usgs.gov/neis/bulletin/

Volcanoes  http://www.geo.mtu.edu/volcanoes/

Asteroid Impact Risk  http://neo.jpl.nasa.gov/risk/

Meteor Showers  http://www.amsmeteors.org/

Sunspots  http://www.sunspotcycle.com/

http://www.gsfc.nasa.gov/GSFC/SpaceSci/sunearth/tracecl.htm

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