For your initial post, go to the Weather Channel's webpage and record tomorrow's, or the next day's, forecast for where you live. Temperature, precipitation, wind and cloud cover should be adequate, but you can add more if you wish. Include any reasons why you think that some of those aspects might not be accurate.
On the day predicted, record those same data. Post the actual weather in the discussion board, including the original prediction. How accurate was the forecast? If it wasn't accurate, what do you think caused the weather to vary from the prediction?