Comet ISON will zip around the far side of the Sun on Thanksgiving Day. If it survives, it will reappear and may be seen 30 to 60 minutes before sunrise or after sunset. Start looking on November 30. You will not be able to directly view the pass around the Sun except online from space telescopes. Never directly view the Sun unless you have a proper solar filter or you will permanently damage your eyes. OK. Back to the comet. To view ISON you will need a clear view of the horizon so it is a good idea to pick your spot in advance and do not give up based on local weather reports. All you need is a few minutes of clear skies just above the horizon where the Sun rises (for a predawn observation) or sets (for an evening observation). As we move into December the comet will continue to rise in the sky.
NASA 20 inch Marshall Space Flight Center telescope in New Mexico November 19, 2013
Check out Sky & Telescope and NASA websites for up to the minute reports!!