National Hurricane Center - http://www.nhc.noaa.gov
Of course, this is the first place I thought about after Hurricane Sandy. Check out the Data archive for info on past hurricanes.
National Weather Servcie - http://www.weather.gov/
For an overview of weather information across the U.S. You can also get more local.
Weather Underground - http://www.wunderground.com/
Also useful for historical weather data.
This is not just idle "storm porn". In litigation, you may need to check some weather facts and these sites can get you started.
Ernster, the Virtual Library Cat