It scans your calendar for flights and presents the corresponding TAF and METAR data which it downloads in the background, together with sun and moon data (calculated) for each airport.
Set your airline code and everything will be done in the background.
You can look several days ahead to stay informed about the weather.
Moreover, if you don't have your flight schedule in the calendar (e.g. as a private pilot), you can define airports that will always be shown, when there are not enough flight duties in the calendar.
So you can stay informed about any weather your interested in.
Adjust update intervals, warning times, etc within the settings page.
Should you miss something, feel free to write a short mail, and I will try to incorporate it!
Be aware, that all data are for information only. For real flight planning, only use official data!