I believe that there are already a number of Web sites out there that allow people to make predictions for whatever they wish. And they put a time stamp on the prediction.

If you are simply planning on organizing something like that then I doubt that anyone would use it. It has been my experience that people tend to ignore such things. Instead, the data need to be easy to evaluate in a minimum amount of time.

A practical Web page (CGI driven) that forecasters around the world might actually make use of could display a time axis. Forecast time windows would then have a line going from left to right for each prediction that would show what the time window was.

At the left of the line or just beneath it or whatever would be information on when the forecast was made, latitude, longitude, a personal ID etc.

Site visitors could direct the CGI program to sort and display the forecasts by time window, personal ID, latitude, longitude, forecasting method etc.

Researchers around the world interested in the information could quickly look at the chart and see who had a time prediction window open for what part of the world.