[kokey]

You are very lucky. I had a script scrape that site (not sure if I broke their TOS) and send me an SMS about 5-10 minutes before a visible pass of something bright including Iridium flares, but I found that even if you know the exact time and direction of where it will happen it is still easy to miss it. It's very nice to see one when you do. If the sky is dark you can often see the satellite before and after it goes bright, but I've seen one shine through a blue sky which must be perplexing to spot by accident by people who don't know about these.