Why is a weather forecast appearing in iCal?
About two weeks ago a daily weather forecast started appearing as an all-day event in iCal but I don't know why. I use Fantastical on my MBA and Agenda on my iPhone and iPad with all three synching between each other. I also sync my devices' calendars with Outlook Exchange on my work Windows PC but the weather forecast isn't appearing there (and I don't want it to so that's fine). Does anyone have any idea how can I find out where this weather update is coming from and which app is responsible? Opening the event on iCal or the other apps doesn't give me any clues. Many thanks.
MacBook Air (13-inch Late 2010), Mac OS X (10.7.4)